linux-kernel - [PATCH 10/12] megaraid_sas: Add smp_mb__after_atomic_*() for instance->fw

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Date:	Sun, 19 Dec 2010 13:22:05 -0800
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	James Bottomley <James.Bottomley@...e.de>,
	Jeff Garzik <jeff@...zik.org>, Christoph Hellwig <hch@....de>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Hannes Reinecke <hare@...e.de>,
	Mike Christie <michaelc@...wisc.edu>
Cc:	Mike Anderson <andmike@...ux.vnet.ibm.com>,
	Tejun Heo <tj@...nel.org>, Vasu Dev <vasu.dev@...ux.intel.com>,
	Tim Chen <tim.c.chen@...ux.intel.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Ravi Anand <ravi.anand@...gic.com>,
	Andrew Vasquez <andrew.vasquez@...gic.com>,
	Joe Eykholt <jeykholt@...co.com>,
	James Smart <james.smart@...lex.com>,
	Douglas Gilbert <dgilbert@...erlog.com>,
	adam radford <aradford@...il.com>,
	Kashyap Desai <Kashyap.Desai@....com>,
	MPTFusionLinux <DL-MPTFusionLinux@....com>,
	Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: [PATCH 10/12] megaraid_sas: Add smp_mb__after_atomic_*() for instance->fw_outstanding

From: Nicholas Bellinger <nab@...ux-iscsi.org>

This patch adds four missing smp_mb__after_atomic_[inc,dec] barriers
for atomic_inc() and atomic_dec() usage with instance->fw_outstanding
within the main I/O dispatcher megasas_queue_command_lck(), completion
callback megasas_complete_cmd() and struct megasas_instance HW reset
queue drain in megasas_issue_pending_cmds_again().

Signed-off-by: Nicholas A. Bellinger <nab@...ux-iscsi.org>
---
 drivers/scsi/megaraid/megaraid_sas.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/scsi/megaraid/megaraid_sas.c b/drivers/scsi/megaraid/megaraid_sas.c
index 7451bc0..31c5419 100644
--- a/drivers/scsi/megaraid/megaraid_sas.c
+++ b/drivers/scsi/megaraid/megaraid_sas.c
@@ -1398,6 +1398,7 @@ megasas_queue_command_lck(struct scsi_cmnd *scmd, void (*done) (struct scsi_cmnd
 	 * Issue the command to the FW
 	 */
 	atomic_inc(&instance->fw_outstanding);
+	smp_mb__after_atomic_inc();
 
 	instance->instancet->fire_cmd(instance, cmd->frame_phys_addr,
 				cmd->frame_count-1, instance->reg_set);
@@ -2068,6 +2069,7 @@ megasas_complete_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd,
 		if (exception) {
 
 			atomic_dec(&instance->fw_outstanding);
+			smp_mb__after_atomic_dec();
 
 			scsi_dma_unmap(cmd->scmd);
 			cmd->scmd->scsi_done(cmd->scmd);
@@ -2116,6 +2118,7 @@ megasas_complete_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd,
 		}
 
 		atomic_dec(&instance->fw_outstanding);
+		smp_mb__after_atomic_dec();
 
 		scsi_dma_unmap(cmd->scmd);
 		cmd->scmd->scsi_done(cmd->scmd);
@@ -2219,6 +2222,7 @@ megasas_issue_pending_cmds_again(struct megasas_instance *instance)
 			cmd, cmd->scmd->cmnd[0], cmd->scmd->serial_number);
 
 			atomic_inc(&instance->fw_outstanding);
+			smp_mb__after_atomic_inc();
 			instance->instancet->fire_cmd(instance,
 					cmd->frame_phys_addr,
 					cmd->frame_count-1, instance->reg_set);
-- 
1.7.3.4

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