linux-toradex.git/drivers/scsi/device_handler/scsi_dh_emc.c, branch v4.1.12

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: 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

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

block: add blk_rq_set_block_pc()

2014-06-06T13:57:37+00:00

With the optimizations around not clearing the full request at alloc
time, we are leaving some of the needed init for REQ_TYPE_BLOCK_PC
up to the user allocating the request.

Add a blk_rq_set_block_pc() that sets the command type to
REQ_TYPE_BLOCK_PC, and properly initializes the members associated
with this type of request. Update callers to use this function instead
of manipulating rq->cmd_type directly.

Includes fixes from Christoph Hellwig  for my half-assed
attempt.

Signed-off-by: Jens Axboe

[SCSI] scsi_dh_emc: Add a match function for emc device handler

2011-12-15T06:55:00+00:00

This patch introduces the match function for emc device handler.  Included
check for TPGS bit before proceeding further.  The match function was
introduced by commit 6c3633d08acf514e2e89aa95d2346ce9d64d719a

Signed-off-by: Babu Moger 
Acked-by: Hannes Reinecke 
Signed-off-by: James Bottomley

scsi: Fix up files implicitly depending on module.h inclusion

2011-10-31T23:31:24+00:00

The module.h header was implicitly present everywhere, so files
with no explicit include of the module infrastructure would build
anyway.  We are now removing the implicit include, and so we need
to call out the module.h file that we need explicitly.

Signed-off-by: Paul Gortmaker

[SCSI] scsi_dh: cosmetic change to sizeof()

2011-02-12T20:13:34+00:00

instead of doing sizeof(struct X) it's better to do sizeof(*v) where v
is the variable pointing to struct X.

Signed-off-by: Hillf Danton 
Signed-off-by: Babu Moger 
Signed-off-by: James Bottomley

[SCSI] scsi_dh_emc: request flag cleanup

2010-04-11T19:04:02+00:00

blk_get_request sets the cmd_flags, so we should not and do not
need to set them. If we did set them to a different value then
it can cause a oops in the elevator code.

Signed-off-by: Mike Christie 
Signed-off-by: James Bottomley