From: Sinan Kaya <okaya@codeaurora.org>
To: netdev@vger.kernel.org, timur@codeaurora.org, sulrich@codeaurora.org
Cc: linux-arm-msm@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Sinan Kaya <okaya@codeaurora.org>,
Harish Patil <harish.patil@cavium.com>,
Manish Chopra <manish.chopra@cavium.com>,
Dept-GELinuxNICDev@cavium.com, linux-kernel@vger.kernel.org
Subject: [PATCH v4 10/17] qlcnic: Eliminate duplicate barriers on weakly-ordered archs
Date: Mon, 19 Mar 2018 22:42:25 -0400 [thread overview]
Message-ID: <1521513753-7325-11-git-send-email-okaya@codeaurora.org> (raw)
In-Reply-To: <1521513753-7325-1-git-send-email-okaya@codeaurora.org>
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 writel() to
writel_relaxed().
Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
Acked-by: Manish Chopra <manish.chopra@cavium.com>
---
drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c
index 46b0372..97c146e7 100644
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c
@@ -478,7 +478,7 @@ irqreturn_t qlcnic_83xx_clear_legacy_intr(struct qlcnic_adapter *adapter)
wmb();
/* clear the interrupt trigger control register */
- writel(0, adapter->isr_int_vec);
+ writel_relaxed(0, adapter->isr_int_vec);
intr_val = readl(adapter->isr_int_vec);
do {
intr_val = readl(adapter->tgt_status_reg);
--
2.7.4
WARNING: multiple messages have this Message-ID (diff)
From: okaya@codeaurora.org (Sinan Kaya)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v4 10/17] qlcnic: Eliminate duplicate barriers on weakly-ordered archs
Date: Mon, 19 Mar 2018 22:42:25 -0400 [thread overview]
Message-ID: <1521513753-7325-11-git-send-email-okaya@codeaurora.org> (raw)
In-Reply-To: <1521513753-7325-1-git-send-email-okaya@codeaurora.org>
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 writel() to
writel_relaxed().
Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
Acked-by: Manish Chopra <manish.chopra@cavium.com>
---
drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c
index 46b0372..97c146e7 100644
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c
@@ -478,7 +478,7 @@ irqreturn_t qlcnic_83xx_clear_legacy_intr(struct qlcnic_adapter *adapter)
wmb();
/* clear the interrupt trigger control register */
- writel(0, adapter->isr_int_vec);
+ writel_relaxed(0, adapter->isr_int_vec);
intr_val = readl(adapter->isr_int_vec);
do {
intr_val = readl(adapter->tgt_status_reg);
--
2.7.4
next prev parent reply other threads:[~2018-03-20 2:42 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-20 2:42 [PATCH v4 00/17] netdev: Eliminate duplicate barriers on weakly-ordered archs Sinan Kaya
2018-03-20 2:42 ` Sinan Kaya
2018-03-20 2:42 ` [Intel-wired-lan] [PATCH v4 01/17] i40e/i40evf: " Sinan Kaya
2018-03-20 2:42 ` Sinan Kaya
2018-03-20 2:42 ` Sinan Kaya
2018-03-20 2:42 ` [Intel-wired-lan] [PATCH v4 02/17] ixgbe: eliminate " Sinan Kaya
2018-03-20 2:42 ` Sinan Kaya
2018-03-20 2:42 ` Sinan Kaya
2018-03-20 2:42 ` [Intel-wired-lan] [PATCH v4 03/17] igbvf: " Sinan Kaya
2018-03-20 2:42 ` Sinan Kaya
2018-03-20 2:42 ` Sinan Kaya
2018-03-20 2:42 ` [Intel-wired-lan] [PATCH v4 04/17] igb: " Sinan Kaya
2018-03-20 2:42 ` Sinan Kaya
2018-03-20 2:42 ` Sinan Kaya
2018-03-20 2:42 ` [Intel-wired-lan] [PATCH v4 05/17] ixgbevf: keep writel() closer to wmb() Sinan Kaya
2018-03-20 2:42 ` Sinan Kaya
2018-03-20 2:42 ` Sinan Kaya
2018-03-20 2:42 ` [Intel-wired-lan] [PATCH v4 06/17] ixgbevf: eliminate duplicate barriers on weakly-ordered archs Sinan Kaya
2018-03-20 2:42 ` Sinan Kaya
2018-03-20 2:42 ` Sinan Kaya
2018-03-20 2:42 ` [Intel-wired-lan] [PATCH v4 07/17] fm10k: Eliminate " Sinan Kaya
2018-03-20 2:42 ` Sinan Kaya
2018-03-20 2:42 ` Sinan Kaya
2018-03-20 2:42 ` [PATCH v4 08/17] drivers: net: cxgb: " Sinan Kaya
2018-03-20 2:42 ` Sinan Kaya
2018-03-20 2:42 ` [PATCH v4 09/17] net: qla3xxx: " Sinan Kaya
2018-03-20 2:42 ` Sinan Kaya
2018-03-20 2:42 ` Sinan Kaya [this message]
2018-03-20 2:42 ` [PATCH v4 10/17] qlcnic: " Sinan Kaya
2018-03-20 2:42 ` [PATCH v4 11/17] bnx2x: " Sinan Kaya
2018-03-20 2:42 ` Sinan Kaya
2018-03-22 10:10 ` Kalluru, Sudarsana
2018-03-22 10:10 ` Kalluru, Sudarsana
2018-03-20 2:42 ` [PATCH v4 12/17] net: cxgb4/cxgb4vf: " Sinan Kaya
2018-03-20 2:42 ` Sinan Kaya
2018-03-21 23:03 ` Casey Leedom
2018-03-21 23:03 ` Casey Leedom
2018-03-22 0:00 ` okaya
2018-03-22 0:00 ` okaya at codeaurora.org
2018-03-20 2:42 ` [PATCH v4 13/17] net: cxgb3: " Sinan Kaya
2018-03-20 2:42 ` Sinan Kaya
2018-03-20 2:42 ` [PATCH v4 14/17] net: qlge: " Sinan Kaya
2018-03-20 2:42 ` Sinan Kaya
2018-03-20 2:42 ` [PATCH v4 15/17] bnxt_en: " Sinan Kaya
2018-03-20 2:42 ` Sinan Kaya
2018-03-20 2:42 ` [PATCH v4 16/17] qed/qede: " Sinan Kaya
2018-03-20 2:42 ` Sinan Kaya
2018-03-20 2:42 ` [PATCH v4 17/17] net: ena: " Sinan Kaya
2018-03-20 2:42 ` Sinan Kaya
2018-03-25 12:06 ` Belgazal, Netanel
2018-03-25 12:06 ` Belgazal, Netanel
2018-03-25 13:33 ` okaya
2018-03-25 13:33 ` okaya at codeaurora.org
2018-03-21 15:56 ` [PATCH v4 00/17] netdev: " David Miller
2018-03-21 15:56 ` David Miller
2018-03-21 19:06 ` Sinan Kaya
2018-03-21 19:06 ` Sinan Kaya
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