linux-kernel - [PATCH v2] ioat: remove chanerr mask setting for IOAT v3.x

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Message-ID: <20121127221608.11315.49374.stgit@djiang5-linux.ch.intel.com>
Date:	Tue, 27 Nov 2012 15:16:08 -0700
From:	Dave Jiang <dave.jiang@...el.com>
To:	djbw@...com, vinod.koul@...el.com
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	jon.mason@...el.com
Subject: [PATCH v2] ioat: remove chanerr mask setting for IOAT v3.x

The existing code set a value in the PCI_CHANERRMSK_INT register
for a workaround to address a pre-silicon bug on the Intel 5520 IO hub that
has been fixed when the hardware was released. There is no need for this
code.

Signed-off-by: Dave Jiang <dave.jiang@...el.com>
---

 drivers/dma/ioat/dma_v3.c |    7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c
index f7f1dc6..fda3b8a1 100644
--- a/drivers/dma/ioat/dma_v3.c
+++ b/drivers/dma/ioat/dma_v3.c
@@ -1126,12 +1126,7 @@ static int ioat3_reset_hw(struct ioat_chan_common *chan)
 	chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET);
 	writel(chanerr, chan->reg_base + IOAT_CHANERR_OFFSET);
 
-	/* -= IOAT ver.3 workarounds =- */
-	/* Write CHANERRMSK_INT with 3E07h to mask out the errors
-	 * that can cause stability issues for IOAT ver.3, and clear any
-	 * pending errors
-	 */
-	pci_write_config_dword(pdev, IOAT_PCI_CHANERRMASK_INT_OFFSET, 0x3e07);
+	/* clear any pending errors */
 	err = pci_read_config_dword(pdev, IOAT_PCI_CHANERR_INT_OFFSET, &chanerr);
 	if (err) {
 		dev_err(&pdev->dev, "channel error register unreachable\n");

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