tree fd6d91ac38deb371bb29b567894056a8c8f9e4e0
parent 11ab244c9faead91683a12e4cb10d26b279bb4aa
author Stefan Weinhuber <wein@de.ibm.com> 1203431367 +0100
committer Martin Schwidefsky <schwidefsky@de.ibm.com> 1203431373 +0100

[S390] dasd: fix locking in __dasd_device_process_final_queue

After setting the status of the cqr and releasing the lock for the
block cqr queue, we call the cqr callback function, which will usually
just trigger the dasd_block_tasklet. But when the tasklet is already
running the cqr might be processed before we invoke the callback
function. In rare cases the callback pointer may already be invalid
by the time we want to call it, which will result in a panic.
Solution: Call the callback function first and then release the lock.

Signed-off-by: Stefan Weinhuber <wein@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>