linux-kernel - [PATCH v2 2/3] dmaengine: ioatdma: Fix error path in ioat3_dma

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Date: Tue, 28 May 2024 09:09:24 +0300
From: Nikita Shubin via B4 Relay <devnull+n.shubin.yadro.com@...nel.org>
To: Vinod Koul <vkoul@...nel.org>, Dave Jiang <dave.jiang@...el.com>, 
 Logan Gunthorpe <logang@...tatee.com>
Cc: Andy Shevchenko <andy.shevchenko@...il.com>, 
 Nikita Shubin <nikita.shubin@...uefel.me>, dmaengine@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux@...ro.com, 
 Nikita Shubin <n.shubin@...ro.com>
Subject: [PATCH v2 2/3] dmaengine: ioatdma: Fix error path in
 ioat3_dma_probe()

From: Nikita Shubin <n.shubin@...ro.com>

Make sure we are disabling interrupts and destroying DMA pool if
pcie_capability_read/write_word() call failed.

Fixes: 511deae0261c ("dmaengine: ioatdma: disable relaxed ordering for ioatdma")
Signed-off-by: Nikita Shubin <n.shubin@...ro.com>
---
 drivers/dma/ioat/init.c | 33 +++++++++++++++------------------
 1 file changed, 15 insertions(+), 18 deletions(-)

diff --git a/drivers/dma/ioat/init.c b/drivers/dma/ioat/init.c
index e76e507ae898..26964b7c8cf1 100644
--- a/drivers/dma/ioat/init.c
+++ b/drivers/dma/ioat/init.c
@@ -534,18 +534,6 @@ static int ioat_probe(struct ioatdma_device *ioat_dma)
 	return err;
 }
 
-static int ioat_register(struct ioatdma_device *ioat_dma)
-{
-	int err = dma_async_device_register(&ioat_dma->dma_dev);
-
-	if (err) {
-		ioat_disable_interrupts(ioat_dma);
-		dma_pool_destroy(ioat_dma->completion_pool);
-	}
-
-	return err;
-}
-
 static void ioat_dma_remove(struct ioatdma_device *ioat_dma)
 {
 	struct dma_device *dma = &ioat_dma->dma_dev;
@@ -1181,9 +1169,9 @@ static int ioat3_dma_probe(struct ioatdma_device *ioat_dma, int dca)
 		       ioat_chan->reg_base + IOAT_DCACTRL_OFFSET);
 	}
 
-	err = ioat_register(ioat_dma);
+	err = dma_async_device_register(&ioat_dma->dma_dev);
 	if (err)
-		return err;
+		goto err_disable_interrupts;
 
 	ioat_kobject_add(ioat_dma, &ioat_ktype);
 
@@ -1192,20 +1180,29 @@ static int ioat3_dma_probe(struct ioatdma_device *ioat_dma, int dca)
 
 	/* disable relaxed ordering */
 	err = pcie_capability_read_word(pdev, PCI_EXP_DEVCTL, &val16);
-	if (err)
-		return pcibios_err_to_errno(err);
+	if (err) {
+		err = pcibios_err_to_errno(err);
+		goto err_disable_interrupts;
+	}
 
 	/* clear relaxed ordering enable */
 	val16 &= ~PCI_EXP_DEVCTL_RELAX_EN;
 	err = pcie_capability_write_word(pdev, PCI_EXP_DEVCTL, val16);
-	if (err)
-		return pcibios_err_to_errno(err);
+	if (err) {
+		err = pcibios_err_to_errno(err);
+		goto err_disable_interrupts;
+	}
 
 	if (ioat_dma->cap & IOAT_CAP_DPS)
 		writeb(ioat_pending_level + 1,
 		       ioat_dma->reg_base + IOAT_PREFETCH_LIMIT_OFFSET);
 
 	return 0;
+
+err_disable_interrupts:
+	ioat_disable_interrupts(ioat_dma);
+	dma_pool_destroy(ioat_dma->completion_pool);
+	return err;
 }
 
 static void ioat_shutdown(struct pci_dev *pdev)

-- 
2.43.2