tree c2e8bd75ecb706b98551e7b011dcbeac107231f4
parent 769578ff811e43ccddd96b15640fa7c9df65c374
author Kashyap, Desai <kashyap.desai@lsi.com> 1276762811 +0530
committer James Bottomley <James.Bottomley@suse.de> 1280250145 -0500

[SCSI] mpt2sas: Copy message frame before releasing to free pool to have a local reference.

Current driver is  not clearing the per device tm_busy flag
following the Task Mangement request completion from the IOCTL path.
When this flag is set, the IO queues are frozen.   The reason the flag
didn't get cleared is becuase the driver is referencing
memory associated to the mpi request following the completion, when
the memory had been reallocated for a new request.  When the memory
was reallocated, the driver didn't clear the flag becuase it was
expecting a task managment reqeust, and the reallocated request was
for SCSI_IO.  To fix the problem the driver needs to have a cached
backup copy of the original reqeust.

Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>