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authorStefan Weinhuber <wein@de.ibm.com>2009-02-11 10:37:31 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2009-02-11 10:37:40 +0100
commit48cae885d5a896030588978f503c73c5ed5e62b1 (patch)
tree52668ad63447cd3395181295f8795c580b77d99e
parentca0b4b7d2cb57a2e24d7e48ce9b411b9baa3bf63 (diff)
[S390] dasd: fix race in dasd timer handling
In dasd_device_set_timer and dasd_block_set_timer we interpret the return value of mod_timer in a wrong way. If the timer expires in the small window between our check of timer_pending and the call to mod_timer, then the timer will be set, mod_timer returns zero and we will call add_timer for a timer that is already pending. As del_timer and mod_timer do all the necessary checking themselves, we can simplify our code and remove the race a the same time. Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
-rw-r--r--drivers/s390/block/dasd.c46
1 files changed, 16 insertions, 30 deletions
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index bd591499414..08c23a92101 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -57,6 +57,8 @@ static void dasd_device_tasklet(struct dasd_device *);
static void dasd_block_tasklet(struct dasd_block *);
static void do_kick_device(struct work_struct *);
static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *);
+static void dasd_device_timeout(unsigned long);
+static void dasd_block_timeout(unsigned long);
/*
* SECTION: Operations on the device structure.
@@ -99,6 +101,8 @@ struct dasd_device *dasd_alloc_device(void)
(unsigned long) device);
INIT_LIST_HEAD(&device->ccw_queue);
init_timer(&device->timer);
+ device->timer.function = dasd_device_timeout;
+ device->timer.data = (unsigned long) device;
INIT_WORK(&device->kick_work, do_kick_device);
device->state = DASD_STATE_NEW;
device->target = DASD_STATE_NEW;
@@ -138,6 +142,8 @@ struct dasd_block *dasd_alloc_block(void)
INIT_LIST_HEAD(&block->ccw_queue);
spin_lock_init(&block->queue_lock);
init_timer(&block->timer);
+ block->timer.function = dasd_block_timeout;
+ block->timer.data = (unsigned long) block;
return block;
}
@@ -915,19 +921,10 @@ static void dasd_device_timeout(unsigned long ptr)
*/
void dasd_device_set_timer(struct dasd_device *device, int expires)
{
- if (expires == 0) {
- if (timer_pending(&device->timer))
- del_timer(&device->timer);
- return;
- }
- if (timer_pending(&device->timer)) {
- if (mod_timer(&device->timer, jiffies + expires))
- return;
- }
- device->timer.function = dasd_device_timeout;
- device->timer.data = (unsigned long) device;
- device->timer.expires = jiffies + expires;
- add_timer(&device->timer);
+ if (expires == 0)
+ del_timer(&device->timer);
+ else
+ mod_timer(&device->timer, jiffies + expires);
}
/*
@@ -935,8 +932,7 @@ void dasd_device_set_timer(struct dasd_device *device, int expires)
*/
void dasd_device_clear_timer(struct dasd_device *device)
{
- if (timer_pending(&device->timer))
- del_timer(&device->timer);
+ del_timer(&device->timer);
}
static void dasd_handle_killed_request(struct ccw_device *cdev,
@@ -1586,19 +1582,10 @@ static void dasd_block_timeout(unsigned long ptr)
*/
void dasd_block_set_timer(struct dasd_block *block, int expires)
{
- if (expires == 0) {
- if (timer_pending(&block->timer))
- del_timer(&block->timer);
- return;
- }
- if (timer_pending(&block->timer)) {
- if (mod_timer(&block->timer, jiffies + expires))
- return;
- }
- block->timer.function = dasd_block_timeout;
- block->timer.data = (unsigned long) block;
- block->timer.expires = jiffies + expires;
- add_timer(&block->timer);
+ if (expires == 0)
+ del_timer(&block->timer);
+ else
+ mod_timer(&block->timer, jiffies + expires);
}
/*
@@ -1606,8 +1593,7 @@ void dasd_block_set_timer(struct dasd_block *block, int expires)
*/
void dasd_block_clear_timer(struct dasd_block *block)
{
- if (timer_pending(&block->timer))
- del_timer(&block->timer);
+ del_timer(&block->timer);
}
/*