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[PATCH] serial_cs: Reduce stack usage in serial_event()
This patch reduces the stack usage of the function serial_event() in serial_cs from 2212 to 228. I used a patched version of gcc 3.4.3 on i386 with -fno-unit-at-a-time disabled. This patch is only compile tested. Acked-by: Randy Dunlap <rddunlap@osdl.org> Signed-off-by: Yum Rayan <yum.rayan@gmail.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Yum Rayan
Linus Torvalds
parent
dbcf31ba68
commit
16f31113a6
@ -107,6 +107,13 @@ struct serial_info {
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int line[4];
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};
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struct serial_cfg_mem {
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tuple_t tuple;
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cisparse_t parse;
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u_char buf[256];
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};
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static void serial_config(dev_link_t * link);
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static int serial_event(event_t event, int priority,
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event_callback_args_t * args);
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@ -357,14 +364,24 @@ static int simple_config(dev_link_t *link)
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static int size_table[2] = { 8, 16 };
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client_handle_t handle = link->handle;
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struct serial_info *info = link->priv;
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tuple_t tuple;
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u_char buf[256];
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cisparse_t parse;
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cistpl_cftable_entry_t *cf = &parse.cftable_entry;
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struct serial_cfg_mem *cfg_mem;
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tuple_t *tuple;
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u_char *buf;
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cisparse_t *parse;
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cistpl_cftable_entry_t *cf;
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config_info_t config;
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int i, j, try;
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int s;
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cfg_mem = kmalloc(sizeof(struct serial_cfg_mem), GFP_KERNEL);
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if (!cfg_mem)
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return -1;
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tuple = &cfg_mem->tuple;
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parse = &cfg_mem->parse;
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cf = &parse->cftable_entry;
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buf = cfg_mem->buf;
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/* If the card is already configured, look up the port and irq */
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i = pcmcia_get_configuration_info(handle, &config);
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if ((i == CS_SUCCESS) && (config.Attributes & CONF_VALID_CLIENT)) {
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@ -377,21 +394,23 @@ static int simple_config(dev_link_t *link)
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port = config.BasePort1 + 0x28;
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info->slave = 1;
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}
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if (info->slave)
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if (info->slave) {
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kfree(cfg_mem);
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return setup_serial(handle, info, port, config.AssignedIRQ);
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}
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}
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link->conf.Vcc = config.Vcc;
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/* First pass: look for a config entry that looks normal. */
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tuple.TupleData = (cisdata_t *) buf;
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tuple.TupleOffset = 0;
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tuple.TupleDataMax = 255;
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tuple.Attributes = 0;
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tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY;
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tuple->TupleData = (cisdata_t *) buf;
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tuple->TupleOffset = 0;
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tuple->TupleDataMax = 255;
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tuple->Attributes = 0;
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tuple->DesiredTuple = CISTPL_CFTABLE_ENTRY;
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/* Two tries: without IO aliases, then with aliases */
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for (s = 0; s < 2; s++) {
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for (try = 0; try < 2; try++) {
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i = first_tuple(handle, &tuple, &parse);
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i = first_tuple(handle, tuple, parse);
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while (i != CS_NO_MORE_ITEMS) {
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if (i != CS_SUCCESS)
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goto next_entry;
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@ -409,14 +428,14 @@ static int simple_config(dev_link_t *link)
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goto found_port;
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}
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next_entry:
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i = next_tuple(handle, &tuple, &parse);
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i = next_tuple(handle, tuple, parse);
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}
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}
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}
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/* Second pass: try to find an entry that isn't picky about
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its base address, then try to grab any standard serial port
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address, and finally try to get any free port. */
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i = first_tuple(handle, &tuple, &parse);
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i = first_tuple(handle, tuple, parse);
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while (i != CS_NO_MORE_ITEMS) {
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if ((i == CS_SUCCESS) && (cf->io.nwin > 0) &&
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((cf->io.flags & CISTPL_IO_LINES_MASK) <= 3)) {
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@ -429,7 +448,7 @@ next_entry:
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goto found_port;
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}
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}
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i = next_tuple(handle, &tuple, &parse);
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i = next_tuple(handle, tuple, parse);
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}
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found_port:
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@ -437,6 +456,7 @@ next_entry:
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printk(KERN_NOTICE
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"serial_cs: no usable port range found, giving up\n");
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cs_error(link->handle, RequestIO, i);
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kfree(cfg_mem);
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return -1;
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}
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@ -450,9 +470,10 @@ next_entry:
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i = pcmcia_request_configuration(link->handle, &link->conf);
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if (i != CS_SUCCESS) {
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cs_error(link->handle, RequestConfiguration, i);
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kfree(cfg_mem);
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return -1;
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}
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kfree(cfg_mem);
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return setup_serial(handle, info, link->io.BasePort1, link->irq.AssignedIRQ);
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}
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@ -460,29 +481,39 @@ static int multi_config(dev_link_t * link)
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{
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client_handle_t handle = link->handle;
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struct serial_info *info = link->priv;
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tuple_t tuple;
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u_char buf[256];
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cisparse_t parse;
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cistpl_cftable_entry_t *cf = &parse.cftable_entry;
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struct serial_cfg_mem *cfg_mem;
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tuple_t *tuple;
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u_char *buf;
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cisparse_t *parse;
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cistpl_cftable_entry_t *cf;
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config_info_t config;
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int i, base2 = 0;
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int i, rc, base2 = 0;
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cfg_mem = kmalloc(sizeof(struct serial_cfg_mem), GFP_KERNEL);
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if (!cfg_mem)
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return -1;
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tuple = &cfg_mem->tuple;
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parse = &cfg_mem->parse;
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cf = &parse->cftable_entry;
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buf = cfg_mem->buf;
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i = pcmcia_get_configuration_info(handle, &config);
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if (i != CS_SUCCESS) {
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cs_error(handle, GetConfigurationInfo, i);
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return -1;
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rc = -1;
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goto free_cfg_mem;
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}
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link->conf.Vcc = config.Vcc;
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tuple.TupleData = (cisdata_t *) buf;
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tuple.TupleOffset = 0;
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tuple.TupleDataMax = 255;
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tuple.Attributes = 0;
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tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY;
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tuple->TupleData = (cisdata_t *) buf;
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tuple->TupleOffset = 0;
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tuple->TupleDataMax = 255;
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tuple->Attributes = 0;
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tuple->DesiredTuple = CISTPL_CFTABLE_ENTRY;
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/* First, look for a generic full-sized window */
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link->io.NumPorts1 = info->multi * 8;
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i = first_tuple(handle, &tuple, &parse);
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i = first_tuple(handle, tuple, parse);
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while (i != CS_NO_MORE_ITEMS) {
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/* The quad port cards have bad CIS's, so just look for a
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window larger than 8 ports and assume it will be right */
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@ -497,14 +528,14 @@ static int multi_config(dev_link_t * link)
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if (i == CS_SUCCESS)
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break;
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}
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i = next_tuple(handle, &tuple, &parse);
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i = next_tuple(handle, tuple, parse);
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}
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/* If that didn't work, look for two windows */
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if (i != CS_SUCCESS) {
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link->io.NumPorts1 = link->io.NumPorts2 = 8;
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info->multi = 2;
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i = first_tuple(handle, &tuple, &parse);
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i = first_tuple(handle, tuple, parse);
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while (i != CS_NO_MORE_ITEMS) {
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if ((i == CS_SUCCESS) && (cf->io.nwin == 2)) {
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link->conf.ConfigIndex = cf->index;
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@ -517,13 +548,14 @@ static int multi_config(dev_link_t * link)
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if (i == CS_SUCCESS)
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break;
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}
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i = next_tuple(handle, &tuple, &parse);
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i = next_tuple(handle, tuple, parse);
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}
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}
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if (i != CS_SUCCESS) {
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cs_error(link->handle, RequestIO, i);
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return -1;
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rc = -1;
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goto free_cfg_mem;
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}
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i = pcmcia_request_irq(link->handle, &link->irq);
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@ -541,7 +573,8 @@ static int multi_config(dev_link_t * link)
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i = pcmcia_request_configuration(link->handle, &link->conf);
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if (i != CS_SUCCESS) {
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cs_error(link->handle, RequestConfiguration, i);
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return -1;
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rc = -1;
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goto free_cfg_mem;
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}
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/* The Oxford Semiconductor OXCF950 cards are in fact single-port:
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@ -554,17 +587,23 @@ static int multi_config(dev_link_t * link)
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setup_serial(handle, info, link->io.BasePort1, link->irq.AssignedIRQ);
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outb(12, base2 + 1);
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}
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return 0;
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rc = 0;
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goto free_cfg_mem;
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}
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setup_serial(handle, info, link->io.BasePort1, link->irq.AssignedIRQ);
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/* The Nokia cards are not really multiport cards */
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if (info->manfid == MANFID_NOKIA)
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return 0;
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if (info->manfid == MANFID_NOKIA) {
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rc = 0;
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goto free_cfg_mem;
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}
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for (i = 0; i < info->multi - 1; i++)
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setup_serial(handle, info, base2 + (8 * i), link->irq.AssignedIRQ);
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return 0;
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setup_serial(handle, info, base2 + (8 * i),
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link->irq.AssignedIRQ);
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rc = 0;
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free_cfg_mem:
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kfree(cfg_mem);
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return rc;
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}
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/*======================================================================
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@ -579,39 +618,49 @@ void serial_config(dev_link_t * link)
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{
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client_handle_t handle = link->handle;
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struct serial_info *info = link->priv;
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tuple_t tuple;
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u_short buf[128];
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cisparse_t parse;
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cistpl_cftable_entry_t *cf = &parse.cftable_entry;
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struct serial_cfg_mem *cfg_mem;
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tuple_t *tuple;
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u_char *buf;
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cisparse_t *parse;
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cistpl_cftable_entry_t *cf;
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int i, last_ret, last_fn;
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DEBUG(0, "serial_config(0x%p)\n", link);
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tuple.TupleData = (cisdata_t *) buf;
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tuple.TupleOffset = 0;
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tuple.TupleDataMax = 255;
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tuple.Attributes = 0;
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cfg_mem = kmalloc(sizeof(struct serial_cfg_mem), GFP_KERNEL);
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if (!cfg_mem)
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goto failed;
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tuple = &cfg_mem->tuple;
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parse = &cfg_mem->parse;
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cf = &parse->cftable_entry;
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buf = cfg_mem->buf;
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tuple->TupleData = (cisdata_t *) buf;
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tuple->TupleOffset = 0;
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tuple->TupleDataMax = 255;
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tuple->Attributes = 0;
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/* Get configuration register information */
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tuple.DesiredTuple = CISTPL_CONFIG;
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last_ret = first_tuple(handle, &tuple, &parse);
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tuple->DesiredTuple = CISTPL_CONFIG;
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last_ret = first_tuple(handle, tuple, parse);
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if (last_ret != CS_SUCCESS) {
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last_fn = ParseTuple;
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goto cs_failed;
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}
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link->conf.ConfigBase = parse.config.base;
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link->conf.Present = parse.config.rmask[0];
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link->conf.ConfigBase = parse->config.base;
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link->conf.Present = parse->config.rmask[0];
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/* Configure card */
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link->state |= DEV_CONFIG;
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/* Is this a compliant multifunction card? */
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tuple.DesiredTuple = CISTPL_LONGLINK_MFC;
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tuple.Attributes = TUPLE_RETURN_COMMON | TUPLE_RETURN_LINK;
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info->multi = (first_tuple(handle, &tuple, &parse) == CS_SUCCESS);
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tuple->DesiredTuple = CISTPL_LONGLINK_MFC;
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tuple->Attributes = TUPLE_RETURN_COMMON | TUPLE_RETURN_LINK;
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info->multi = (first_tuple(handle, tuple, parse) == CS_SUCCESS);
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/* Is this a multiport card? */
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tuple.DesiredTuple = CISTPL_MANFID;
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if (first_tuple(handle, &tuple, &parse) == CS_SUCCESS) {
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tuple->DesiredTuple = CISTPL_MANFID;
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if (first_tuple(handle, tuple, parse) == CS_SUCCESS) {
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info->manfid = le16_to_cpu(buf[0]);
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for (i = 0; i < MULTI_COUNT; i++)
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if ((info->manfid == multi_id[i].manfid) &&
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@ -623,13 +672,13 @@ void serial_config(dev_link_t * link)
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/* Another check for dual-serial cards: look for either serial or
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multifunction cards that ask for appropriate IO port ranges */
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tuple.DesiredTuple = CISTPL_FUNCID;
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tuple->DesiredTuple = CISTPL_FUNCID;
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if ((info->multi == 0) &&
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((first_tuple(handle, &tuple, &parse) != CS_SUCCESS) ||
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(parse.funcid.func == CISTPL_FUNCID_MULTI) ||
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(parse.funcid.func == CISTPL_FUNCID_SERIAL))) {
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tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY;
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if (first_tuple(handle, &tuple, &parse) == CS_SUCCESS) {
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((first_tuple(handle, tuple, parse) != CS_SUCCESS) ||
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(parse->funcid.func == CISTPL_FUNCID_MULTI) ||
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(parse->funcid.func == CISTPL_FUNCID_SERIAL))) {
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tuple->DesiredTuple = CISTPL_CFTABLE_ENTRY;
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if (first_tuple(handle, tuple, parse) == CS_SUCCESS) {
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if ((cf->io.nwin == 1) && (cf->io.win[0].len % 8 == 0))
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info->multi = cf->io.win[0].len >> 3;
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if ((cf->io.nwin == 2) && (cf->io.win[0].len == 8) &&
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@ -664,6 +713,7 @@ void serial_config(dev_link_t * link)
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link->dev = &info->node[0];
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link->state &= ~DEV_CONFIG_PENDING;
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kfree(cfg_mem);
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return;
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cs_failed:
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@ -671,6 +721,7 @@ void serial_config(dev_link_t * link)
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failed:
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serial_remove(link);
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link->state &= ~DEV_CONFIG_PENDING;
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kfree(cfg_mem);
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}
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/*======================================================================
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