irda: vlsi_ir: fix check for DMA mapping errors

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>

diff --git a/drivers/net/irda/vlsi_ir.c b/drivers/net/irda/vlsi_ir.c
index ffedad2a360afb8154f0e1e8b9be0c1d388fa5d9..15b920086251633e2ee0ee0b26ba0046859e5299 100644 (file)
--- a/drivers/net/irda/vlsi_ir.c
+++ b/drivers/net/irda/vlsi_ir.c
@@ -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;
                        }