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ACPI: thinkpad-acpi: allow for syscall restart in sysfs handlers

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Map an mutex_lock_interruptible() error return into ERESTARTSYS, as the
only possible error from mutex_lock_interruptible is EINTR, and that will
only happen if signal_pending() causes the mutex lock attempt to abort.

This still allows signals to be delivered ASAP, which is much nicer than
just doing mutex_lock, and still shadows userspace from EINTR when
SA_RESTART is active.

Problem reported by Peter Jordan.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Cc: Jean Delvare <khali@linux-fr.org>
Cc: Peter Jordan <usernetwork@gmx.info>
Cc: Richard Neill <rn214@hermes.cam.ac.uk>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Henrique de Moraes Holschuh 2007-10-30 17:46:24 -02:00 committed by Len Brown
parent b856f5b8c0
commit fc589a3ce5
1 changed files with 16 additions and 24 deletions
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40
drivers/misc/thinkpad_acpi.c
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@ -1342,9 +1342,8 @@ static int hotkey_read(char *p)
return len;
}
res = mutex_lock_interruptible(&hotkey_mutex);
if (res < 0)
return res;
if (mutex_lock_interruptible(&hotkey_mutex))
return -ERESTARTSYS;
res = hotkey_get(&status, &mask);
mutex_unlock(&hotkey_mutex);
if (res)
@ -1373,9 +1372,8 @@ static int hotkey_write(char *buf)
if (!tp_features.hotkey)
return -ENODEV;
res = mutex_lock_interruptible(&hotkey_mutex);
if (res < 0)
return res;
if (mutex_lock_interruptible(&hotkey_mutex))
return -ERESTARTSYS;
res = hotkey_get(&status, &mask);
if (res)
@ -3768,9 +3766,8 @@ static ssize_t fan_pwm1_store(struct device *dev,
/* scale down from 0-255 to 0-7 */
newlevel = (s >> 5) & 0x07;
rc = mutex_lock_interruptible(&fan_mutex);
if (rc < 0)
return rc;
if (mutex_lock_interruptible(&fan_mutex))
return -ERESTARTSYS;
rc = fan_get_status(&status);
if (!rc && (status &
@ -4020,9 +4017,8 @@ static int fan_get_status_safe(u8 *status)
int rc;
u8 s;
rc = mutex_lock_interruptible(&fan_mutex);
if (rc < 0)
return rc;
if (mutex_lock_interruptible(&fan_mutex))
return -ERESTARTSYS;
rc = fan_get_status(&s);
if (!rc)
fan_update_desired_level(s);
@ -4156,9 +4152,8 @@ static int fan_set_level_safe(int level)
if (!fan_control_allowed)
return -EPERM;
rc = mutex_lock_interruptible(&fan_mutex);
if (rc < 0)
return rc;
if (mutex_lock_interruptible(&fan_mutex))
return -ERESTARTSYS;
if (level == TPACPI_FAN_LAST_LEVEL)
level = fan_control_desired_level;
@ -4179,9 +4174,8 @@ static int fan_set_enable(void)
if (!fan_control_allowed)
return -EPERM;
rc = mutex_lock_interruptible(&fan_mutex);
if (rc < 0)
return rc;
if (mutex_lock_interruptible(&fan_mutex))
return -ERESTARTSYS;
switch (fan_control_access_mode) {
case TPACPI_FAN_WR_ACPI_FANS:
@ -4235,9 +4229,8 @@ static int fan_set_disable(void)
if (!fan_control_allowed)
return -EPERM;
rc = mutex_lock_interruptible(&fan_mutex);
if (rc < 0)
return rc;
if (mutex_lock_interruptible(&fan_mutex))
return -ERESTARTSYS;
rc = 0;
switch (fan_control_access_mode) {
@ -4274,9 +4267,8 @@ static int fan_set_speed(int speed)
if (!fan_control_allowed)
return -EPERM;
rc = mutex_lock_interruptible(&fan_mutex);
if (rc < 0)
return rc;
if (mutex_lock_interruptible(&fan_mutex))
return -ERESTARTSYS;
rc = 0;
switch (fan_control_access_mode) {