Patch "[PATCH 063/135] megaraid_sas: Do not allow PCI access during OCR" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

[PATCH 063/135] megaraid_sas: Do not allow PCI access during OCR

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
0063-megaraid_sas-Do-not-allow-PCI-access-during-OCR.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Sumit Saxena <[email protected]>
Date: Thu, 28 Jan 2016 21:04:22 +0530
Subject: [PATCH 063/135] megaraid_sas: Do not allow PCI access during OCR

[ Upstream commit 11c71cb4ab7cd901b9d6f0ff267c102778c1c8ef ]

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.

---
 drivers/scsi/megaraid/megaraid_sas.h      |    2 
 drivers/scsi/megaraid/megaraid_sas_base.c |  254 +++++++++---------------------
 2 files changed, 82 insertions(+), 174 deletions(-)

@@ -1083,6 +1083,8 @@ struct megasas_ctrl_info {
 
 #define VD_EXT_DEBUG 0
 
+#define SCAN_PD_CHANNEL	0x1
+#define SCAN_VD_CHANNEL	0x2
 
 enum MR_SCSI_CMD_TYPE {
 	READ_WRITE_LDIO = 0,

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/0063-megaraid_sas-Do-not-allow-PCI-access-during-OCR.patch queue-4.4/0064-megaraid_sas-Fix-SMAP-issue.patch queue-4.4/0062-megaraid-Fix-possible-NULL-pointer-deference-in-mrai.patch