Messages in this thread Patch in this message | | | From | Ben Hutchings <> | Date | Tue, 24 Nov 2015 22:33:59 +0000 | Subject | [PATCH 3.2 23/52] megaraid_sas: Do not use PAGE_SIZE for max_sectors |
| |
3.2.74-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: "sumit.saxena@avagotech.com" <sumit.saxena@avagotech.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@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> Signed-off-by: Ben Hutchings <ben@decadent.org.uk> --- drivers/scsi/megaraid/megaraid_sas.h | 2 ++ drivers/scsi/megaraid/megaraid_sas_base.c | 2 +- 2 files changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/scsi/megaraid/megaraid_sas.h +++ b/drivers/scsi/megaraid/megaraid_sas.h @@ -300,6 +300,8 @@ enum MR_EVT_ARGS { MR_EVT_ARGS_GENERIC, }; + +#define SGE_BUFFER_SIZE 4096 /* * define constants for device list query options */ --- a/drivers/scsi/megaraid/megaraid_sas_base.c +++ b/drivers/scsi/megaraid/megaraid_sas_base.c @@ -3636,7 +3636,7 @@ static int megasas_init_fw(struct megasa } 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;
| |