From b99dbe56d511eb07de33bfa1b99ac5a6ff76ae08 Mon Sep 17 00:00:00 2001 From: Tomas Henzl Date: Mon, 1 Feb 2016 15:12:04 +0100 Subject: [PATCH] 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 Reviewed-by: Kashyap Desai Acked-by: Kashyap Desai Signed-off-by: Martin K. Petersen --- drivers/scsi/megaraid/megaraid_sas_base.c | 1 + drivers/scsi/megaraid/megaraid_sas_fusion.c | 1 + 2 files changed, 2 insertions(+) diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c index e0b4ca1c57e1..5c08568ccfbf 100644 --- a/drivers/scsi/megaraid/megaraid_sas_base.c +++ b/drivers/scsi/megaraid/megaraid_sas_base.c @@ -749,6 +749,7 @@ megasas_fire_cmd_skinny(struct megasas_instance *instance, &(regs)->inbound_high_queue_port); writel((lower_32_bits(frame_phys_addr) | (frame_count<<1))|1, &(regs)->inbound_low_queue_port); + mmiowb(); spin_unlock_irqrestore(&instance->hba_lock, flags); } diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c index d9d0029fb1b0..98a848bdfdc2 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 } -- 2.30.2