> -----Original Message----- > From: Tomas Henzl [mailto:thenzl@xxxxxxxxxx] > Sent: Friday, January 29, 2016 11:05 PM > To: 'linux-scsi@xxxxxxxxxxxxxxx' > Cc: Sumit.Saxena@xxxxxxxxxxxxx; Desai, Kashyap; Uday Lingala > Subject: megaraid_sas: add an i/o barrier > > A barrier should be added to ensure proper ordering of memory mapped > writes. > > Signed-off-by: Tomas Henzl <thenzl@xxxxxxxxxx> > --- > drivers/scsi/megaraid/megaraid_sas_fusion.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c > b/drivers/scsi/megaraid/megaraid_sas_fusion.c > index d9d0029fb1..98a848bdfd 100644 > --- a/drivers/scsi/megaraid/megaraid_sas_fusion.c > +++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c > @@ -204,6 +204,7 @@ megasas_fire_cmd_fusion(struct > megasas_instance *instance, > &instance->reg_set->inbound_low_queue_port); > writel(le32_to_cpu(req_desc->u.high), > &instance->reg_set->inbound_high_queue_port); > + mmiowb(); > spin_unlock_irqrestore(&instance->hba_lock, flags); #endif } Tomas- We may need similar changes around below Functions as well, because there is no associated readX or mmiowb() call. megasas_fire_cmd_xscale() megasas_fire_cmd_ppc() megasas_fire_cmd_skinny() megasas_fire_cmd_gen2() Also, wrireq() routine in same function megasas_fire_cmd_fusion() need i/o barrier. > -- > 2.4.3 -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
