megaraid_sas : SMAP restriction--do not access user memory from IOCTL code

megaraid_sas : SMAP restriction--do not access user memory from IOCTL code

Orabug: 22620626

This is an issue on SMAP enabled CPUs and 32 bit apps running on 64 bit
OS. Do not access user memory from kernel code. The SMAP bit restricts
accessing user memory from kernel code.

Cc: <stable@vger.kernel.org>
Signed-off-by: Sumit Saxena <sumit.saxena@avagotech.com>
Signed-off-by: Kashyap Desai <kashyap.desai@avagotech.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
(cherry picked from commit 323c4a02c631d00851d8edc4213c4d184ef83647)
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>