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| author | Peter Oberparleiter <peter.oberparleiter@de.ibm.com> | 2008-08-21 19:46:39 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2008-08-21 19:46:41 +0200 |
| commit | 91c36919a456589f4f073671474a1f899e0d3c2b (patch) | |
| tree | 63cb2ee1afd9b00bf2ea4959482d58f402bb21f3 /drivers/s390/cio/device.h | |
| parent | 49fd38bdaa96f093fcad3176a781a4d0de8f8602 (diff) | |
| download | op-kernel-dev-91c36919a456589f4f073671474a1f899e0d3c2b.zip op-kernel-dev-91c36919a456589f4f073671474a1f899e0d3c2b.tar.gz | |
[S390] cio: call ccw driver notify function with lock held
Calling a ccw driver's notify function without the ccw device lock
held opens up a race window between discovery and handling of a change
in the device operational state. As a result, the device driver may
encounter unexpected device malfunction, leading to out-of-retry
situations or similar.
Remove race by extending the ccw device lock from state change
discovery to the calling of the notify function.
Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/cio/device.h')
| -rw-r--r-- | drivers/s390/cio/device.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/s390/cio/device.h b/drivers/s390/cio/device.h index 9800a83..6f5c3f2 100644 --- a/drivers/s390/cio/device.h +++ b/drivers/s390/cio/device.h @@ -72,7 +72,6 @@ dev_fsm_final_state(struct ccw_device *cdev) } extern struct workqueue_struct *ccw_device_work; -extern struct workqueue_struct *ccw_device_notify_work; extern wait_queue_head_t ccw_device_init_wq; extern atomic_t ccw_device_init_count; @@ -120,6 +119,7 @@ int ccw_device_stlck(struct ccw_device *); void ccw_device_trigger_reprobe(struct ccw_device *); void ccw_device_kill_io(struct ccw_device *); int ccw_device_notify(struct ccw_device *, int); +void ccw_device_set_notoper(struct ccw_device *cdev); /* qdio needs this. */ void ccw_device_set_timeout(struct ccw_device *, int); |
