• Mikuláš Patočka's avatar
    sym53c8xx_2: Set DID_REQUEUE return code when aborting squeue · fd1232b2
    Mikuláš Patočka authored
    This patch fixes I/O errors with the sym53c8xx_2 driver when the disk
    returns QUEUE FULL status.
    When the controller encounters an error (including QUEUE FULL or BUSY
    status), it aborts all not yet submitted requests in the function
    This function aborts them with DID_SOFT_ERROR.
    If the disk has full tag queue, the request that caused the overflow is
    aborted with QUEUE FULL status (and the scsi midlayer properly retries
    it until it is accepted by the disk), but the sym53c8xx_2 driver aborts
    the following requests with DID_SOFT_ERROR --- for them, the midlayer
    does just a few retries and then signals the error up to sd.
    The result is that disk returning QUEUE FULL causes request failures.
    The error was reproduced on 53c895 with COMPAQ BD03685A24 disk
    (rebranded ST336607LC) with command queue 48 or 64 tags.  The disk has
    64 tags, but under some access patterns it return QUEUE FULL when there
    are less than 64 pending tags.  The SCSI specification allows returning
    QUEUE FULL anytime and it is up to the host to retry.
    Signed-off-by: Mikuláš Patočka's avatarMikulas Patocka <mpatocka@redhat.com>
    Cc: Matthew Wilcox <matthew@wil.cx>
    Cc: James Bottomley <JBottomley@Parallels.com>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
sym_hipd.c 144 KB