linux-kernel - [PATCH 4.20 83/88] scsi: csiostor: fix calls to dma_set_mask_and

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Message-Id: <20190304081633.979349948@linuxfoundation.org>
Date:   Mon,  4 Mar 2019 09:23:06 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hannes Reinecke <hare@...e.com>,
        Christoph Hellwig <hch@....de>,
        "Ewan D. Milne" <emilne@...hat.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 4.20 83/88] scsi: csiostor: fix calls to dma_set_mask_and_coherent()

4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Hannes Reinecke <hare@...e.de>

commit 732f3238dcf27acb92959a99b7923dc49395980e upstream.

The change to use dma_set_mask_and_coherent() incorrectly made a second
call with the 32 bit DMA mask value when the call with the 64 bit DMA mask
value succeeded.

Fixes: c22b332d811b ("scsi: csiostor: switch to generic DMA API")
Cc: <stable@...r.kernel.org>
Signed-off-by: Hannes Reinecke <hare@...e.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Reviewed-by: Ewan D. Milne <emilne@...hat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/csiostor/csio_init.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/scsi/csiostor/csio_init.c
+++ b/drivers/scsi/csiostor/csio_init.c
@@ -210,8 +210,11 @@ csio_pci_init(struct pci_dev *pdev, int
 	pci_set_master(pdev);
 	pci_try_set_mwi(pdev);

-	if (dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64)) ||
-	    dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32))) {
+	rv = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
+	if (rv)
+		rv = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
+	if (rv) {
+		rv = -ENODEV;
 		dev_err(&pdev->dev, "No suitable DMA available.\n");
 		goto err_release_regions;
 	}