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irda: vlsi_ir: fix check for DMA mapping errors

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vlsi_alloc_ring() checks for DMA mapping errors by comparing
returned address with zero, while pci_dma_mapping_error() should be used.

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

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexey Khoroshilov 2017-03-25 01:48:08 +03:00 committed by David S. Miller
parent 834a61d455
commit 6ac3b77a6f
1 changed files with 4 additions and 4 deletions
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8
drivers/net/irda/vlsi_ir.c
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@ -418,8 +418,9 @@ static struct vlsi_ring *vlsi_alloc_ring(struct pci_dev *pdev, struct ring_descr
memset(rd, 0, sizeof(*rd));
rd->hw = hwmap + i;
rd->buf = kmalloc(len, GFP_KERNEL|GFP_DMA);
if (rd->buf == NULL ||
!(busaddr = pci_map_single(pdev, rd->buf, len, dir))) {
if (rd->buf)
busaddr = pci_map_single(pdev, rd->buf, len, dir);
if (rd->buf == NULL || pci_dma_mapping_error(pdev, busaddr)) {
if (rd->buf) {
net_err_ratelimited("%s: failed to create PCI-MAP for %p\n",
__func__, rd->buf);
@ -430,8 +431,7 @@ static struct vlsi_ring *vlsi_alloc_ring(struct pci_dev *pdev, struct ring_descr
rd = r->rd + j;
busaddr = rd_get_addr(rd);
rd_set_addr_status(rd, 0, 0);
if (busaddr)
pci_unmap_single(pdev, busaddr, len, dir);
pci_unmap_single(pdev, busaddr, len, dir);
kfree(rd->buf);
rd->buf = NULL;
}