[PATCH V2] scsi: mpt3sas: remove redundant wmb

Brian King brking at linux.vnet.ibm.com
Fri Apr 21 11:10:57 EDT 2017

On 04/21/2017 02:56 AM, Sreekanth Reddy wrote:
> On Thu, Apr 20, 2017 at 7:58 AM, Martin K. Petersen
> <martin.petersen at oracle.com> wrote:
>> Sinan Kaya <okaya at codeaurora.org> writes:
>>> Due to relaxed ordering requirements on multiple architectures,
>>> drivers are required to use wmb/rmb/mb combinations when they need to
>>> guarantee observability between the memory and the HW.
>>> The mpt3sas driver is already using wmb() for this purpose.  However,
>>> it issues a writel following wmb(). writel() function on arm/arm64
>>> arhictectures have an embedded wmb() call inside.
> [Sreekanth] Whether same thing applicable for SPARC & POWER
> architectures. If yes then we are fine with this patch changes.

This is also true for Power. 

Reviewed-by: Brian King <brking at linux.vnet.ibm.com>


Brian King
Power Linux I/O
IBM Linux Technology Center

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