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megaraid_sas: Add an i/o barrier

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[ Upstream commit b99dbe56d5 ]

A barrier should be added to ensure proper ordering of memory mapped
writes.

Signed-off-by: Tomas Henzl <thenzl@redhat.com>
Reviewed-by: Kashyap Desai <kashyap.desai@broadcom.com>
Acked-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tomas Henzl
2016-02-01 15:12:04 +01:00
committed by Greg Kroah-Hartman
parent 948cb1ca1f
commit e77b14a6f3
2 changed files with 2 additions and 0 deletions
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1
drivers/scsi/megaraid/megaraid_sas_base.c
View File

@@ -735,6 +735,7 @@ 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);
}

1
drivers/scsi/megaraid/megaraid_sas_fusion.c
View File

@@ -201,6 +201,7 @@ 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
}