forked from Minki/linux
Input: yealink - reliably kill urbs
Yealink uses two URBs that submit each other. This arrangement cannot be reliably killed with usb_kill_urb() alone, as there's a window during which the wrong URB may be killed. The fix is to introduce a flag. [dtor@mail.ru: remove spinlock, flag alone should be enough] Signed-off-by: Oliver Neukum <oneukum@suse.de> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
parent
4ad88901dd
commit
b4ecda3e96
@ -119,6 +119,8 @@ struct yealink_dev {
|
||||
u8 lcdMap[ARRAY_SIZE(lcdMap)]; /* state of LCD, LED ... */
|
||||
int key_code; /* last reported key */
|
||||
|
||||
unsigned int shutdown:1;
|
||||
|
||||
int stat_ix;
|
||||
union {
|
||||
struct yld_status s;
|
||||
@ -424,10 +426,10 @@ send_update:
|
||||
static void urb_irq_callback(struct urb *urb)
|
||||
{
|
||||
struct yealink_dev *yld = urb->context;
|
||||
int ret;
|
||||
int ret, status = urb->status;
|
||||
|
||||
if (urb->status)
|
||||
err("%s - urb status %d", __func__, urb->status);
|
||||
if (status)
|
||||
err("%s - urb status %d", __func__, status);
|
||||
|
||||
switch (yld->irq_data->cmd) {
|
||||
case CMD_KEYPRESS:
|
||||
@ -447,32 +449,37 @@ static void urb_irq_callback(struct urb *urb)
|
||||
|
||||
yealink_do_idle_tasks(yld);
|
||||
|
||||
ret = usb_submit_urb(yld->urb_ctl, GFP_ATOMIC);
|
||||
if (ret)
|
||||
err("%s - usb_submit_urb failed %d", __func__, ret);
|
||||
if (!yld->shutdown) {
|
||||
ret = usb_submit_urb(yld->urb_ctl, GFP_ATOMIC);
|
||||
if (ret && ret != -EPERM)
|
||||
err("%s - usb_submit_urb failed %d", __func__, ret);
|
||||
}
|
||||
}
|
||||
|
||||
static void urb_ctl_callback(struct urb *urb)
|
||||
{
|
||||
struct yealink_dev *yld = urb->context;
|
||||
int ret;
|
||||
int ret = 0, status = urb->status;
|
||||
|
||||
if (urb->status)
|
||||
err("%s - urb status %d", __func__, urb->status);
|
||||
if (status)
|
||||
err("%s - urb status %d", __func__, status);
|
||||
|
||||
switch (yld->ctl_data->cmd) {
|
||||
case CMD_KEYPRESS:
|
||||
case CMD_SCANCODE:
|
||||
/* ask for a response */
|
||||
ret = usb_submit_urb(yld->urb_irq, GFP_ATOMIC);
|
||||
if (!yld->shutdown)
|
||||
ret = usb_submit_urb(yld->urb_irq, GFP_ATOMIC);
|
||||
break;
|
||||
default:
|
||||
/* send new command */
|
||||
yealink_do_idle_tasks(yld);
|
||||
ret = usb_submit_urb(yld->urb_ctl, GFP_ATOMIC);
|
||||
if (!yld->shutdown)
|
||||
ret = usb_submit_urb(yld->urb_ctl, GFP_ATOMIC);
|
||||
break;
|
||||
}
|
||||
|
||||
if (ret)
|
||||
if (ret && ret != -EPERM)
|
||||
err("%s - usb_submit_urb failed %d", __func__, ret);
|
||||
}
|
||||
|
||||
@ -531,8 +538,18 @@ static void input_close(struct input_dev *dev)
|
||||
{
|
||||
struct yealink_dev *yld = input_get_drvdata(dev);
|
||||
|
||||
yld->shutdown = 1;
|
||||
/*
|
||||
* Make sure the flag is seen by other CPUs before we start
|
||||
* killing URBs so new URBs won't be submitted
|
||||
*/
|
||||
smp_wmb();
|
||||
|
||||
usb_kill_urb(yld->urb_ctl);
|
||||
usb_kill_urb(yld->urb_irq);
|
||||
|
||||
yld->shutdown = 0;
|
||||
smp_wmb();
|
||||
}
|
||||
|
||||
/*******************************************************************************
|
||||
@ -809,9 +826,6 @@ static int usb_cleanup(struct yealink_dev *yld, int err)
|
||||
if (yld == NULL)
|
||||
return err;
|
||||
|
||||
usb_kill_urb(yld->urb_irq); /* parameter validation in core/urb */
|
||||
usb_kill_urb(yld->urb_ctl); /* parameter validation in core/urb */
|
||||
|
||||
if (yld->idev) {
|
||||
if (err)
|
||||
input_free_device(yld->idev);
|
||||
|
Loading…
Reference in New Issue
Block a user