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staging: gdm7240: a TTY rewrite according to the latest TTY APIs

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Fixed mis-use of mutex for gdm_table. gdm_table is refered to only
inside tty_install and port destrcut, and usb callbacks use internal
reference which was saved during urb submission

Signed-off-by: Won Kang <wonkang@gctsemi.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Won Kang 2013-08-16 13:13:44 +09:00 committed by Greg Kroah-Hartman
parent 7ee4c1b949
commit bf0373f1c6
4 changed files with 56 additions and 45 deletions
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9
drivers/staging/gdm724x/gdm_mux.c
View File

@ -25,7 +25,6 @@
#include <linux/usb/cdc.h>
#include "gdm_mux.h"
#include "gdm_tty.h"
struct workqueue_struct *mux_rx_wq;
@ -196,7 +195,7 @@ static int up_to_host(struct mux_rx *r)
ret = r->callback(mux_header->data,
payload_size,
index,
mux_dev->minor[index],
mux_dev->tty_dev,
RECV_PACKET_PROCESS_CONTINUE
);
if (ret == TO_HOST_BUFFER_REQUEST_FAIL) {
@ -209,7 +208,7 @@ static int up_to_host(struct mux_rx *r)
ret = r->callback(NULL,
0,
index,
mux_dev->minor[index],
mux_dev->tty_dev,
RECV_PACKET_PROCESS_COMPLETE
);
break;
@ -283,7 +282,7 @@ static void gdm_mux_rcv_complete(struct urb *urb)
}
static int gdm_mux_recv(void *priv_dev,
int (*cb)(void *data, int len, int tty_index, int minor, int complete)
int (*cb)(void *data, int len, int tty_index, struct tty_dev *tty_dev, int complete)
)
{
struct mux_dev *mux_dev = priv_dev;
@ -562,7 +561,7 @@ static int gdm_mux_probe(struct usb_interface *intf, const struct usb_device_id
goto out;
}
for (i = 0; i < TTY_MAX_COUNT; i++)
mux_dev->minor[i] = tty_dev->minor[i];
mux_dev->tty_dev = tty_dev;
out:
if (ret < 0) {

14
drivers/staging/gdm724x/gdm_mux.h
View File

@ -18,6 +18,8 @@
#include <linux/usb.h>
#include <linux/list.h>
#include "gdm_tty.h"
#define PM_NORMAL 0
#define PM_SUSPEND 1
@ -57,7 +59,10 @@ struct mux_rx {
void *mux_dev;
u32 offset;
u32 len;
int (*callback)(void *data, int len, int tty_index, int minor,
int (*callback)(void *data,
int len,
int tty_index,
struct tty_dev *tty_dev,
int complete);
};
@ -78,10 +83,13 @@ struct mux_dev {
struct delayed_work work_rx;
struct usb_interface *intf;
int usb_state;
int (*rx_cb)(void *data, int len, int tty_index, int minor,
int (*rx_cb)(void *data,
int len,
int tty_index,
struct tty_dev *tty_dev,
int complete);
spinlock_t write_lock;
u8 minor[2];
struct tty_dev *tty_dev;
};
#endif /* _GDM_MUX_H_ */

45
drivers/staging/gdm724x/gdm_tty.c
View File

@ -89,19 +89,22 @@ static int gdm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
mutex_lock(&gdm_table_lock);
gdm = gdm_table[i][j];
mutex_unlock(&gdm_table_lock);
if (gdm == NULL)
if (gdm == NULL) {
mutex_unlock(&gdm_table_lock);
return -ENODEV;
}
tty_port_get(&gdm->port);
ret = tty_standard_install(driver, tty);
if (ret) {
tty_port_put(&gdm->port);
mutex_unlock(&gdm_table_lock);
return ret;
}
tty->driver_data = gdm;
mutex_unlock(&gdm_table_lock);
return 0;
}
@ -130,14 +133,13 @@ static void gdm_tty_close(struct tty_struct *tty, struct file *filp)
tty_port_close(&gdm->port, tty, filp);
}
static int gdm_tty_recv_complete(void *data, int len, int index, int minor, int complete)
static int gdm_tty_recv_complete(void *data,
int len,
int index,
struct tty_dev *tty_dev,
int complete)
{
struct gdm *gdm;
mutex_lock(&gdm_table_lock);
gdm = gdm_table[index][minor];
mutex_unlock(&gdm_table_lock);
struct gdm *gdm = tty_dev->gdm[index];
if (!GDM_TTY_READY(gdm)) {
if (complete == RECV_PACKET_PROCESS_COMPLETE)
gdm_tty_recv(gdm, gdm_tty_recv_complete);
@ -223,31 +225,29 @@ int register_lte_tty_device(struct tty_dev *tty_dev, struct device *device)
return -ENOMEM;
mutex_lock(&gdm_table_lock);
for (j = 0; j < GDM_TTY_MINOR; j++) {
if (!gdm_table[i][j])
break;
}
if (j == GDM_TTY_MINOR) {
tty_dev->minor[i] = GDM_TTY_MINOR;
kfree(gdm);
mutex_unlock(&gdm_table_lock);
return -EINVAL;
}
gdm_table[i][j] = gdm;
mutex_unlock(&gdm_table_lock);
tty_dev->minor[i] = j;
tty_dev->gdm[i] = gdm;
tty_port_init(&gdm->port);
gdm->port.ops = &gdm_port_ops;
gdm->index = i;
gdm->minor = j;
gdm->tty_dev = tty_dev;
tty_port_register_device(&gdm->port, gdm_driver[i], j, device);
tty_port_register_device(&gdm->port, gdm_driver[i], gdm->minor, device);
}
for (i = 0; i < MAX_ISSUE_NUM; i++)
@ -261,31 +261,24 @@ void unregister_lte_tty_device(struct tty_dev *tty_dev)
struct gdm *gdm;
struct tty_struct *tty;
int i;
int j;
for (i = 0; i < TTY_MAX_COUNT; i++) {
j = tty_dev->minor[i];
if (j >= GDM_TTY_MINOR)
gdm = tty_dev->gdm[i];
if (!gdm)
continue;
mutex_lock(&gdm_table_lock);
gdm = gdm_table[i][j];
gdm_table[gdm->index][gdm->minor] = NULL;
mutex_unlock(&gdm_table_lock);
if (!gdm)
continue;
tty = tty_port_tty_get(&gdm->port);
if (tty) {
tty_vhangup(tty);
tty_kref_put(tty);
}
tty_unregister_device(gdm_driver[i], j);
tty_unregister_device(gdm_driver[i], gdm->minor);
tty_port_put(&gdm->port);
}
}

33
drivers/staging/gdm724x/gdm_tty.h
View File

@ -33,17 +33,6 @@ enum RECV_PACKET_PROCESS {
RECV_PACKET_PROCESS_CONTINUE = 1,
};
struct tty_dev {
void *priv_dev;
int (*send_func)(void *priv_dev, void *data, int len, int tty_index,
void (*cb)(void *cb_data), void *cb_data);
int (*recv_func)(void *priv_dev, int (*cb)(void *data, int len,
int tty_index, int minor, int complete));
int (*send_control)(void *priv_dev, int request, int value, void *data,
int len);
u8 minor[2];
};
struct gdm {
struct tty_dev *tty_dev;
struct tty_port port;
@ -51,6 +40,28 @@ struct gdm {
unsigned int minor;
};
struct tty_dev {
void *priv_dev;
int (*send_func)(void *priv_dev,
void *data,
int len,
int tty_index,
void (*cb)(void *cb_data),
void *cb_data);
int (*recv_func)(void *priv_dev,
int (*cb)(void *data,
int len,
int tty_index,
struct tty_dev *tty_dev,
int complete));
int (*send_control)(void *priv_dev,
int request,
int value,
void *data,
int len);
struct gdm *gdm[2];
};
int register_lte_tty_driver(void);
void unregister_lte_tty_driver(void);
int register_lte_tty_device(struct tty_dev *tty_dev, struct device *dev);