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authorPeter Oberparleiter <peter.oberparleiter@de.ibm.com>2008-08-21 19:46:39 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-08-21 19:46:41 +0200
commit91c36919a456589f4f073671474a1f899e0d3c2b (patch)
tree63cb2ee1afd9b00bf2ea4959482d58f402bb21f3 /drivers/s390/block
parent49fd38bdaa96f093fcad3176a781a4d0de8f8602 (diff)
downloadop-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/block')
-rw-r--r--drivers/s390/block/dasd.c5
1 files changed, 1 insertions, 4 deletions
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 1b6c52e..acb7801 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -2333,13 +2333,11 @@ int dasd_generic_notify(struct ccw_device *cdev, int event)
{
struct dasd_device *device;
struct dasd_ccw_req *cqr;
- unsigned long flags;
int ret;
- device = dasd_device_from_cdev(cdev);
+ device = dasd_device_from_cdev_locked(cdev);
if (IS_ERR(device))
return 0;
- spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
ret = 0;
switch (event) {
case CIO_GONE:
@@ -2369,7 +2367,6 @@ int dasd_generic_notify(struct ccw_device *cdev, int event)
ret = 1;
break;
}
- spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
dasd_put_device(device);
return ret;
}
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