linux-toradex.git/drivers/scsi/scsi_lib.c, branch v4.7

scsi_lib: correctly retry failed zero length REQ_TYPE_FS commands

2016-05-22T18:52:45+00:00

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: Sebastian Parschauer 
Signed-off-by: James E.J. Bottomley 
Tested-by: Jack Wang 
Signed-off-by: Martin K. Petersen

scsi_lib: Decode T10 vendor IDs

2016-05-11T01:34:16+00:00

Some arrays / HBAs will only present T10 vendor IDs, so we should be
decoding them, too.

[mkp: Fixed T10 spelling]

Suggested-by: Paul Mackerras 
Signed-off-by: Hannes Reinecke 
Tested-by: Paul Mackerras 
Reviewed-by: Bart Van Assche 
Signed-off-by: Martin K. Petersen

lib: scatterlist: move SG pool code from SCSI driver to lib/sg_pool.c

2016-04-15T20:53:14+00:00

Now it's ready to move the mempool based SG chained allocator code from
SCSI driver to lib/sg_pool.c, which will be compiled only based on a Kconfig
symbol CONFIG_SG_POOL.

SCSI selects CONFIG_SG_POOL.

Reviewed-by: Christoph Hellwig 
Signed-off-by: Ming Lin 
Reviewed-by: Sagi Grimberg 
Signed-off-by: Martin K. Petersen

scsi: rename SCSI_MAX_{SG, SG_CHAIN}_SEGMENTS

2016-04-15T20:53:14+00:00

Rename SCSI_MAX_SG_SEGMENTS to SG_CHUNK_SIZE, which means the amount
we fit into a single scatterlist chunk.

Rename SCSI_MAX_SG_CHAIN_SEGMENTS to SG_MAX_SEGMENTS.

Will move these 2 generic definitions to scatterlist.h later.

Reviewed-by: Christoph Hellwig 
Acked-by: Bart Van Assche  (for ib_srp changes)
Signed-off-by: Ming Lin 
Acked-by: Tejun Heo 
Reviewed-by: Sagi Grimberg 
Signed-off-by: Martin K. Petersen

scsi: rename SG related struct and functions

2016-04-15T20:53:13+00:00

Rename SCSI specific struct and functions to more genenic names.

Reviewed-by: Christoph Hellwig 
Signed-off-by: Ming Lin 
Reviewed-by: Sagi Grimberg 
Signed-off-by: Martin K. Petersen

scsi: replace "mq" with "first_chunk" in SG functions

2016-04-15T20:53:13+00:00

Parameter "bool mq" is block driver specific.
Change it to "first_chunk" to make it more generic.

Reviewed-by: Christoph Hellwig 
Signed-off-by: Ming Lin 
Reviewed-by: Sagi Grimberg 
Signed-off-by: Martin K. Petersen

scsi: replace "scsi_data_buffer" with "sg_table" in SG functions

2016-04-15T20:53:12+00:00

Replace parameter "struct scsi_data_buffer" with "struct sg_table" in
SG alloc/free functions to make them generic.

Reviewed-by: Christoph Hellwig 
Signed-off-by: Ming Lin 
Reviewed-by: Sagi Grimberg 
Signed-off-by: Martin K. Petersen

Merge branch 'fixes' into misc

2016-03-15T22:24:44+00:00

SCSI: Free resources when we return BLKPREP_INVALID

2016-02-26T22:25:32+00:00

When called scsi_prep_fn return BLKPREP_INVALID, we should use the same
code with BLKPREP_KILL in scsi_prep_return.

Signed-off-by: Yiwen Jiang 
Signed-off-by: Martin K. Petersen

scsi_dh: add 'rescan' callback

2016-02-24T02:27:02+00:00

If a device needs to be rescanned the device_handler might need
to be rechecked, too.
So add a 'rescan' callback to the device handler and call it
upon scsi_rescan_device(). The rescan callback will be invoked
from the Unit Attention handling of ASC/ASCQ 3F 03
(INQUIRY DATA HAS CHANGED).

Reviewed-by: Bart Van Assche 
Reviewed-by: Christoph Hellwig 
Signed-off-by: Hannes Reinecke 
Signed-off-by: Martin K. Petersen