]> git.baikalelectronics.ru Git - kernel.git/commit
megaraid_sas: Do not allow PCI access during OCR
authorSumit Saxena <sumit.saxena@avagotech.com>
Thu, 28 Jan 2016 15:34:22 +0000 (21:04 +0530)
committerMartin K. Petersen <martin.petersen@oracle.com>
Wed, 24 Feb 2016 02:27:02 +0000 (21:27 -0500)
commit09262bcf15e77e5f374fabdef1e15bebe5306e9a
tree2f0e8ba94af31b930211076881154413c15c24a7
parent09f02bd433780c96f11a1ba994764be0cae0760f
megaraid_sas: Do not allow PCI access during OCR

This patch will do synhronization between OCR function and AEN function
using "reset_mutex" lock.  reset_mutex will be acquired only in the
first half of the AEN function which issues a DCMD. Second half of the
function which calls SCSI API (scsi_add_device/scsi_remove_device)
should be out of reset_mutex to avoid deadlock between scsi_eh thread
and driver.

During chip reset (inside OCR function), there should not be any PCI
access and AEN function (which is called in delayed context) may be
firing DCMDs (doing PCI writes) when chip reset is happening in parallel
which will cause FW fault. This patch will solve the problem by making
AEN thread and OCR thread mutually exclusive.

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>
drivers/scsi/megaraid/megaraid_sas.h
drivers/scsi/megaraid/megaraid_sas_base.c