linux-kernel - [PATCH 4.2.y-ckt 066/211] megaraid_sas: Do not use PAGE_SIZE for max

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Message-Id: <1452023119-25647-67-git-send-email-kamal@canonical.com>
Date:	Tue,  5 Jan 2016 11:42:54 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Sumit Saxena <sumit.saxena@...gotech.com>,
	Kashyap Desai <kashyap.desai@...gotech.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 4.2.y-ckt 066/211] megaraid_sas: Do not use PAGE_SIZE for max_sectors

4.2.8-ckt1 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: "sumit.saxena@...gotech.com" <sumit.saxena@...gotech.com>

commit 357ae967ad66e357f78b5cfb5ab6ca07fb4a7758 upstream.

Do not use PAGE_SIZE marco to calculate max_sectors per I/O
request. Driver code assumes PAGE_SIZE will be always 4096 which can
lead to wrongly calculated value if PAGE_SIZE is not 4096. This issue
was reported in Ubuntu Bugzilla Bug #1475166.

Signed-off-by: Sumit Saxena <sumit.saxena@...gotech.com>
Signed-off-by: Kashyap Desai <kashyap.desai@...gotech.com>
Reviewed-by: Tomas Henzl <thenzl@...hat.com>
Reviewed-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/scsi/megaraid/megaraid_sas.h      | 2 ++
 drivers/scsi/megaraid/megaraid_sas_base.c | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h
index 20c3754..ebf821b 100644
--- a/drivers/scsi/megaraid/megaraid_sas.h
+++ b/drivers/scsi/megaraid/megaraid_sas.h
@@ -364,6 +364,8 @@ enum MR_EVT_ARGS {
 	MR_EVT_ARGS_GENERIC,
 };
 
+
+#define SGE_BUFFER_SIZE	4096
 /*
  * define constants for device list query options
  */
diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index 55d17e7..00eb416 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -4755,7 +4755,7 @@ static int megasas_init_fw(struct megasas_instance *instance)
 
 
 	instance->max_sectors_per_req = instance->max_num_sge *
-						PAGE_SIZE / 512;
+						SGE_BUFFER_SIZE / 512;
 	if (tmp_sectors && (instance->max_sectors_per_req > tmp_sectors))
 		instance->max_sectors_per_req = tmp_sectors;
 
-- 
1.9.1

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