p54pci: don't return zero on failure paths in p54p_probe()

If pci_set_dma_mask() or pci_set_consistent_dma_mask() fails in p54p_probe(),
it breaks off initialization, deallocates all resources, but returns zero.
Similar issue is if check for returned value of pci_resource_len() fails.

The patch implements proper error code propagation.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Acked-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/net/wireless/p54/p54pci.c b/drivers/net/wireless/p54/p54pci.c
index 933e5d941937..57e3af8ebb4b 100644
--- a/drivers/net/wireless/p54/p54pci.c
+++ b/drivers/net/wireless/p54/p54pci.c
@@ -559,6 +559,7 @@ static int p54p_probe(struct pci_dev *pdev,
         mem_len = pci_resource_len(pdev, 0);
         if (mem_len < sizeof(struct p54p_csr)) {
                 dev_err(&pdev->dev, "Too short PCI resources\n");
+                err = -ENODEV;
                 goto err_disable_dev;
         }
 
@@ -568,8 +569,10 @@ static int p54p_probe(struct pci_dev *pdev,
                 goto err_disable_dev;
         }
 
-        if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32)) ||
-            pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32))) {
+        err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
+        if (!err)
+                err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
+        if (err) {
                 dev_err(&pdev->dev, "No suitable DMA available\n");
                 goto err_free_reg;
         }