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net: qla3xxx: Eliminate duplicate barriers on weakly-ordered archs 

Code includes wmb() followed by writel(). writel() already has a
barrier on some architectures like arm64.

This ends up CPU observing two barriers back to back before executing
the register write.

Since code already has an explicit barrier call, changing code to

wmb()
writel_relaxed()
mmiowb()

for multi-arch support.

Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sinan Kaya 2018-03-25 10:39:15 -04:00 committed by David S. Miller
parent 14ef85b431
commit 3c95c56732
1 changed files with 3 additions and 2 deletions
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5
drivers/net/ethernet/qlogic/qla3xxx.c
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@ -1858,8 +1858,9 @@ static void ql_update_small_bufq_prod_index(struct ql3_adapter *qdev)
qdev->small_buf_release_cnt -= 8;
}
wmb();
writel(qdev->small_buf_q_producer_index,
&port_regs->CommonRegs.rxSmallQProducerIndex);
writel_relaxed(qdev->small_buf_q_producer_index,
&port_regs->CommonRegs.rxSmallQProducerIndex);
mmiowb();
}
}