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Input: atkbd - use guard notation when acquiring mutex

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This makes the code more compact and error handling more robust
by ensuring that mutexes are released in all code paths when control
leaves critical section.

Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20240825051627.2848495-4-dmitry.torokhov@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Dmitry Torokhov 2024-08-24 22:16:07 -07:00
parent d5322d537c
commit 934976f61e
1 changed files with 15 additions and 22 deletions
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37
drivers/input/keyboard/atkbd.c
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@ -639,7 +639,7 @@ static void atkbd_event_work(struct work_struct *work)
{
struct atkbd *atkbd = container_of(work, struct atkbd, event_work.work);
mutex_lock(&atkbd->mutex);
guard(mutex)(&atkbd->mutex);
if (!atkbd->enabled) {
/*
@ -657,8 +657,6 @@ static void atkbd_event_work(struct work_struct *work)
if (test_and_clear_bit(ATKBD_REP_EVENT_BIT, &atkbd->event_mask))
atkbd_set_repeat_rate(atkbd);
}
mutex_unlock(&atkbd->mutex);
}
/*
@ -1361,7 +1359,7 @@ static int atkbd_reconnect(struct serio *serio)
{
struct atkbd *atkbd = atkbd_from_serio(serio);
struct serio_driver *drv = serio->drv;
int retval = -1;
int error;
if (!atkbd || !drv) {
dev_dbg(&serio->dev,
@ -1369,16 +1367,17 @@ static int atkbd_reconnect(struct serio *serio)
return -1;
}
mutex_lock(&atkbd->mutex);
guard(mutex)(&atkbd->mutex);
atkbd_disable(atkbd);
if (atkbd->write) {
if (atkbd_probe(atkbd))
goto out;
error = atkbd_probe(atkbd);
if (error)
return error;
if (atkbd->set != atkbd_select_set(atkbd, atkbd->set, atkbd->extra))
goto out;
return -EIO;
/*
* Restore LED state and repeat rate. While input core
@ -1404,11 +1403,7 @@ static int atkbd_reconnect(struct serio *serio)
if (atkbd->write)
atkbd_activate(atkbd);
retval = 0;
out:
mutex_unlock(&atkbd->mutex);
return retval;
return 0;
}
static const struct serio_device_id atkbd_serio_ids[] = {
@ -1465,17 +1460,15 @@ static ssize_t atkbd_attr_set_helper(struct device *dev, const char *buf, size_t
struct atkbd *atkbd = atkbd_from_serio(serio);
int retval;
retval = mutex_lock_interruptible(&atkbd->mutex);
if (retval)
scoped_guard(mutex_intr, &atkbd->mutex) {
atkbd_disable(atkbd);
retval = handler(atkbd, buf, count);
atkbd_enable(atkbd);
return retval;
}
atkbd_disable(atkbd);
retval = handler(atkbd, buf, count);
atkbd_enable(atkbd);
mutex_unlock(&atkbd->mutex);
return retval;
return -EINTR;
}
static ssize_t atkbd_show_extra(struct atkbd *atkbd, char *buf)