mpt2sas, mpt3sas: fix upper bound for the module parameter max_sgl_entries
Change Set:
1. Extended the upper boundary restriction for the module parameter
max_sgl_entries. Earlier, the max_sgl_entries was capped at the
SCSI_MAX_SG_SEGMENTS kernel definition. With this change, the user
would be able to set the max_sgl_entries to any value which is
greater than SCSI_MAX_SG_SEGMENTS and less than the minimum of
SCSI_MAX_SG_CHAIN_SEGMENTS & hardware limit (Calculated using
IOCFacts's MaxChainDepth).
2. Added a print for the message log whenever the user sets the
max_sgl_entries to a value greater than SCSI_MAX_SG_SEGMENTS to
warn about the kernel definition overriding.
Signed-off-by: Sreekanth Reddy <Sreekanth.Reddy@avagotech.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c
index 678e1ff..a428fdd 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_base.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_base.c
@@ -2666,8 +2666,14 @@
if (sg_tablesize < MPT3SAS_MIN_PHYS_SEGMENTS)
sg_tablesize = MPT3SAS_MIN_PHYS_SEGMENTS;
- else if (sg_tablesize > MPT3SAS_MAX_PHYS_SEGMENTS)
- sg_tablesize = MPT3SAS_MAX_PHYS_SEGMENTS;
+ else if (sg_tablesize > MPT3SAS_MAX_PHYS_SEGMENTS) {
+ sg_tablesize = min_t(unsigned short, sg_tablesize,
+ SCSI_MAX_SG_CHAIN_SEGMENTS);
+ pr_warn(MPT3SAS_FMT
+ "sg_tablesize(%u) is bigger than kernel"
+ " defined SCSI_MAX_SG_SEGMENTS(%u)\n", ioc->name,
+ sg_tablesize, MPT3SAS_MAX_PHYS_SEGMENTS);
+ }
ioc->shost->sg_tablesize = sg_tablesize;
ioc->hi_priority_depth = facts->HighPriorityCredit;