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authorMichael Holzheu <holzheu@de.ibm.com>2008-05-30 10:03:25 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-05-30 10:03:33 +0200
commitf71ad62a264a89cb1952df0c92b167005de8d1b0 (patch)
treede173ab5f138204d5ba5458de249c39e5faecdbd /Documentation/hwmon/max6650
parent97195d6b411fec8e33aa55b6a7c3dde7984d65ca (diff)
[S390] tape: Fix race condition in tape block device driver
Due to incorrect function call sequence it can happen that a tape block request is finished before the request is taken from the block request queue. The following sequence leads to that condition: * tapeblock_start_request() -> start CCW program * Request finishes -> IO interrupt * tapeblock_end_request() * end_that_request_last() If blkdev_dequeue_request() has not been called before end_that_request_last(), a kernel bug is triggered in end_that_request_last() because the request is still queued. To solve that problem blkdev_dequeue_request() has to be called before starting the CCW program. Signed-off-by: Michael Holzheu <holzheu@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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