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megaraid_sas: Do not use PAGE_SIZE for max_sectors

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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.

Cc: <stable@vger.kernel.org>
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>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
sumit.saxena@avagotech.com 2015-10-15 13:40:04 +05:30 • committed by Martin K. Petersen
parent 7364d34b87
commit 357ae967ad
2 changed files with 3 additions and 1 deletions
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2
drivers/scsi/megaraid/megaraid_sas.h
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@ -388,6 +388,8 @@ enum MR_EVT_ARGS {
MR_EVT_ARGS_GENERIC, MR_EVT_ARGS_GENERIC,
}; };
#define SGE_BUFFER_SIZE 4096
/* /*
* define constants for device list query options * define constants for device list query options
*/ */

2
drivers/scsi/megaraid/megaraid_sas_base.c
View file

@ -4871,7 +4871,7 @@ static int megasas_init_fw(struct megasas_instance *instance)
instance->max_sectors_per_req = instance->max_num_sge * 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)) if (tmp_sectors && (instance->max_sectors_per_req > tmp_sectors))
instance->max_sectors_per_req = tmp_sectors; instance->max_sectors_per_req = tmp_sectors;