Skip to content
Commit a621bac3 authored by James Bottomley's avatar James Bottomley Committed by Martin K. Petersen
Browse files

scsi_lib: correctly retry failed zero length REQ_TYPE_FS commands



When SCSI was written, all commands coming from the filesystem
(REQ_TYPE_FS commands) had data.  This meant that our signal for needing
to complete the command was the number of bytes completed being equal to
the number of bytes in the request.  Unfortunately, with the advent of
flush barriers, we can now get zero length REQ_TYPE_FS commands, which
confuse this logic because they satisfy the condition every time.  This
means they never get retried even for retryable conditions, like UNIT
ATTENTION because we complete them early assuming they're done.  Fix
this by special casing the early completion condition to recognise zero
length commands with errors and let them drop through to the retry code.

Cc: stable@vger.kernel.org
Reported-by: default avatarSebastian Parschauer <s.parschauer@gmx.de>
Signed-off-by: default avatarJames E.J. Bottomley <jejb@linux.vnet.ibm.com>
Tested-by: default avatarJack Wang <jinpu.wang@profitbricks.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent 97f00905
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment