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authorHenrique de Moraes Holschuh <hmh@hmh.eng.br>2007-10-30 17:46:24 -0200
committerLen Brown <len.brown@intel.com>2007-11-05 13:07:11 -0500
commitfc589a3ce5f38db6239c147da4f9172a25575ecc (patch)
tree3732f557e21ef93787a0ebfcad4323ec00165dea /drivers/misc
parentb856f5b8c022b75bb0504a8c1ce16a5f1656e08b (diff)
ACPI: thinkpad-acpi: allow for syscall restart in sysfs handlers
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>
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/thinkpad_acpi.c40
1 files changed, 16 insertions, 24 deletions
diff --git a/drivers/misc/thinkpad_acpi.c b/drivers/misc/thinkpad_acpi.c
index 251110d0ec8..306daa524c0 100644
--- a/drivers/misc/thinkpad_acpi.c
+++ b/drivers/misc/thinkpad_acpi.c
@@ -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) {