Patch "[PATCH 065/135] megaraid_sas: Add an i/o barrier" 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 065/135] megaraid_sas: Add an i/o barrier

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:

     0065-megaraid_sas-Add-an-i-o-barrier.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: Tomas Henzl <[email protected]>
Date: Mon, 1 Feb 2016 15:12:04 +0100
Subject: [PATCH 065/135] megaraid_sas: Add an i/o barrier

[ Upstream commit b99dbe56d511eb07de33bfa1b99ac5a6ff76ae08 ]

A barrier should be added to ensure proper ordering of memory mapped writes.

---
 drivers/scsi/megaraid/megaraid_sas_base.c   |    1 +
 drivers/scsi/megaraid/megaraid_sas_fusion.c |    1 +
 2 files changed, 2 insertions(+)

@@ -735,6 +735,7 @@ megasas_fire_cmd_skinny(struct megasas_i
 	       &(regs)->inbound_high_queue_port);
 	writel((lower_32_bits(frame_phys_addr) | (frame_count<<1))|1,
 	       &(regs)->inbound_low_queue_port);
+	mmiowb();
 	spin_unlock_irqrestore(&instance->hba_lock, flags);
 }
 

@@ -201,6 +201,7 @@ megasas_fire_cmd_fusion(struct megasas_i
 		&instance->reg_set->inbound_low_queue_port);
 	writel(le32_to_cpu(req_desc->u.high),
 		&instance->reg_set->inbound_high_queue_port);
+	mmiowb();
 	spin_unlock_irqrestore(&instance->hba_lock, flags);
 #endif
 }

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

queue-4.4/0065-megaraid_sas-Add-an-i-o-barrier.patch queue-4.4/0096-arcmsr-fixes-not-release-allocated-resource.patch queue-4.4/0073-mpt3sas-Fix-for-Asynchronous-completion-of-timedout-.patch queue-4.4/0063-megaraid_sas-Do-not-allow-PCI-access-during-OCR.patch queue-4.4/0072-mpt3sas-A-correction-in-unmap_resources.patch queue-4.4/0064-megaraid_sas-Fix-SMAP-issue.patch