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usb-redir: Don't delay handling of open events to a bottom half

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There is no need for this, and doing so means that a backend trying to
write immediately after an open event will see qemu_chr_be_can_write
returning 0, which not all backends handle well as there is no wakeup
mechanism to detect when the frontend does become writable.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Hans de Goede 2012-08-23 16:37:19 +02:00 committed by Gerd Hoffmann
parent 181133404f
commit ed9873bfbf
1 changed files with 53 additions and 47 deletions
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48
hw/usb/redirect.c
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@ -79,8 +79,8 @@ struct USBRedirDevice {
/* Data passed from chardev the fd_read cb to the usbredirparser read cb */
const uint8_t *read_buf;
int read_buf_size;
/* For async handling of open/close */
QEMUBH *open_close_bh;
/* For async handling of close */
QEMUBH *chardev_close_bh;
/* To delay the usb attach in case of quick chardev close + open */
QEMUTimer *attach_timer;
int64_t next_attach_time;
@ -784,18 +784,11 @@ static int usbredir_handle_control(USBDevice *udev, USBPacket *p,
* from within the USBDevice data / control packet callbacks and doing a
* usb_detach from within these callbacks is not a good idea.
*
* So we use a bh handler to take care of close events. We also handle
* open events from this callback to make sure that a close directly followed
* by an open gets handled in the right order.
* So we use a bh handler to take care of close events.
*/
static void usbredir_open_close_bh(void *opaque)
static void usbredir_chardev_close_bh(void *opaque)
{
USBRedirDevice *dev = opaque;
uint32_t caps[USB_REDIR_CAPS_SIZE] = { 0, };
char version[32];
strcpy(version, "qemu usb-redir guest ");
pstrcat(version, sizeof(version), qemu_get_version());
usbredir_device_disconnect(dev);
@ -803,8 +796,20 @@ static void usbredir_open_close_bh(void *opaque)
usbredirparser_destroy(dev->parser);
dev->parser = NULL;
}
}
static void usbredir_chardev_open(USBRedirDevice *dev)
{
uint32_t caps[USB_REDIR_CAPS_SIZE] = { 0, };
char version[32];
/* Make sure any pending closes are handled (no-op if none pending) */
usbredir_chardev_close_bh(dev);
qemu_bh_cancel(dev->chardev_close_bh);
strcpy(version, "qemu usb-redir guest ");
pstrcat(version, sizeof(version), qemu_get_version());
if (dev->cs->opened) {
dev->parser = qemu_oom_check(usbredirparser_create());
dev->parser->priv = dev;
dev->parser->log_func = usbredir_log;
@ -833,7 +838,6 @@ static void usbredir_open_close_bh(void *opaque)
usbredirparser_init(dev->parser, version, caps, USB_REDIR_CAPS_SIZE, 0);
usbredirparser_do_write(dev->parser);
}
}
static void usbredir_do_attach(void *opaque)
{
@ -856,13 +860,13 @@ static int usbredir_chardev_can_read(void *opaque)
{
USBRedirDevice *dev = opaque;
if (dev->parser) {
/* usbredir_parser_do_read will consume *all* data we give it */
return 1024 * 1024;
} else {
/* usbredir_open_close_bh hasn't handled the open event yet */
if (!dev->parser) {
WARNING("chardev_can_read called on non open chardev!\n");
return 0;
}
/* usbredir_parser_do_read will consume *all* data we give it */
return 1024 * 1024;
}
static void usbredir_chardev_read(void *opaque, const uint8_t *buf, int size)
@ -886,8 +890,10 @@ static void usbredir_chardev_event(void *opaque, int event)
switch (event) {
case CHR_EVENT_OPENED:
usbredir_chardev_open(dev);
break;
case CHR_EVENT_CLOSED:
qemu_bh_schedule(dev->open_close_bh);
qemu_bh_schedule(dev->chardev_close_bh);
break;
}
}
@ -917,7 +923,7 @@ static int usbredir_initfn(USBDevice *udev)
}
}
dev->open_close_bh = qemu_bh_new(usbredir_open_close_bh, dev);
dev->chardev_close_bh = qemu_bh_new(usbredir_chardev_close_bh, dev);
dev->attach_timer = qemu_new_timer_ms(vm_clock, usbredir_do_attach, dev);
QTAILQ_INIT(&dev->asyncq);
@ -957,7 +963,7 @@ static void usbredir_handle_destroy(USBDevice *udev)
qemu_chr_fe_close(dev->cs);
qemu_chr_delete(dev->cs);
/* Note must be done after qemu_chr_close, as that causes a close event */
qemu_bh_delete(dev->open_close_bh);
qemu_bh_delete(dev->chardev_close_bh);
qemu_del_timer(dev->attach_timer);
qemu_free_timer(dev->attach_timer);