linux-stable.git/drivers/scsi/device_handler, branch v4.1.41

scsi_dh_rdac: always retry MODE SELECT on command lock violation

2016-02-28T05:09:41+00:00

[ Upstream commit d2d06d4fe0f2cc2df9b17fefec96e6e1a1271d91 ]

If MODE SELECT returns with sense '05/91/36' (command lock violation)
it should always be retried without counting the number of retries.
During an HBA upgrade or similar circumstances one might see a flood
of MODE SELECT command from various HBAs, which will easily trigger
the sense code and exceed the retry count.

Cc: 
Signed-off-by: Hannes Reinecke 
Reviewed-by: Johannes Thumshirn 
Signed-off-by: Martin K. Petersen 
Signed-off-by: Sasha Levin

scsi: fix device handler detach oops

2015-02-02T12:45:28+00:00

This fixes a regression caused by commit 1d5203 ("scsi: handle more device
handler setup/teardown in common code").

The bug is that the alua detach() callout will try to access the
sddev->scsi_dh_data, but we have already set it to NULL. This patch
moves the clearing of that field to after detach() is called.

Signed-off-by: Mike Christie 
Signed-off-by: Christoph Hellwig

scsi: handle more device handler setup/teardown in common code

2014-11-12T10:19:36+00:00

Move all code to set up and tear down sdev->scsi_dh_data to common code.

Signed-off-by: Christoph Hellwig 
Reviewed-by: Mike Christie 
Reviewed-by: Hannes Reinecke

scsi: device handlers must have attach and detach methods

2014-11-12T10:19:33+00:00

Signed-off-by: Christoph Hellwig 
Reviewed-by: Mike Christie 
Reviewed-by: Hannes Reinecke

scsi: remove struct scsi_dh_devlist

2014-11-12T10:19:29+00:00

All drivers now do their own matching, so there is no more need to expose
a device list as part of the interface.

Signed-off-by: Christoph Hellwig 
Reviewed-by: Mike Christie 
Reviewed-by: Hannes Reinecke

scsi: use container_of to get at device handler private data

2014-11-12T10:19:25+00:00

Signed-off-by: Christoph Hellwig 
Reviewed-by: Mike Christie 
Reviewed-by: Hannes Reinecke

scsi_dh: get module reference outside of device handler

2014-11-12T10:19:22+00:00

We need to grab a reference to the module before calling the attach
routines to avoid a small race vs module removal.  It also cleans up
the code significantly as a side effect.

Signed-off-by: Christoph Hellwig 
Reviewed-by: Mike Christie 
Reviewed-by: Hannes Reinecke

scsi_dh_hp_sw: fix return value on failed allocation

2014-11-12T10:19:17+00:00

Signed-off-by: Christoph Hellwig 
Reviewed-by: Mike Christie 
Reviewed-by: Hannes Reinecke

scsi: TUR path is down after adapter gets reset with multipath

2014-11-10T14:23:27+00:00

This patch fixes an issue with multipath ipr SAS devices which require a
start unit command to be issued following an adapter reset. Without this
patch, paths get marked failed following an adapter reset and since the
error handler never gets invoked to issue the start unit, the paths are
never recovered. Returning FAILED for this case ensures the error
handler wakes up to issue the start unit.

Signed-off-by: Brian King 
Tested-by: Wen Xiong 
Reviewed-by: Hannes Reinecke 
Signed-off-by: Christoph Hellwig

block,scsi: fixup blk_get_request dead queue scenarios

2014-08-28T16:03:46+00:00

The blk_get_request function may fail in low-memory conditions or during
device removal (even if __GFP_WAIT is set). To distinguish between these
errors, modify the blk_get_request call stack to return the appropriate
ERR_PTR. Verify that all callers check the return status and consider
IS_ERR instead of a simple NULL pointer check.

For consistency, make a similar change to the blk_mq_alloc_request leg
of blk_get_request.  It may fail if the queue is dead, or the caller was
unwilling to wait.

Signed-off-by: Joe Lawrence 
Acked-by: Jiri Kosina  [for pktdvd]
Acked-by: Boaz Harrosh  [for osd]
Reviewed-by: Jeff Moyer 
Signed-off-by: Jens Axboe