IB/ipath: Check return value of dma_map_single()

This fixes an obvious oversight where the return value is not checked
for error.

Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --git a/drivers/infiniband/hw/ipath/ipath_sdma.c b/drivers/infiniband/hw/ipath/ipath_sdma.c
index 284c9bc..8e255ad 100644 (file)
--- a/drivers/infiniband/hw/ipath/ipath_sdma.c
+++ b/drivers/infiniband/hw/ipath/ipath_sdma.c
@@ -698,10 +698,8 @@ retry:
 
        addr = dma_map_single(&dd->pcidev->dev, tx->txreq.map_addr,
                              tx->map_len, DMA_TO_DEVICE);
-       if (dma_mapping_error(&dd->pcidev->dev, addr)) {
-               ret = -EIO;
-               goto unlock;
-       }
+       if (dma_mapping_error(&dd->pcidev->dev, addr))
+               goto ioerr;
 
        dwoffset = tx->map_len >> 2;
        make_sdma_desc(dd, sdmadesc, (u64) addr, dwoffset, 0);
@@ -741,6 +739,8 @@ retry:
                dw = (len + 3) >> 2;
                addr = dma_map_single(&dd->pcidev->dev, sge->vaddr, dw << 2,
                                      DMA_TO_DEVICE);
+               if (dma_mapping_error(&dd->pcidev->dev, addr))
+                       goto unmap;
                make_sdma_desc(dd, sdmadesc, (u64) addr, dw, dwoffset);
                /* SDmaUseLargeBuf has to be set in every descriptor */
                if (tx->txreq.flags & IPATH_SDMA_TXREQ_F_USELARGEBUF)
@@ -798,7 +798,18 @@ retry:
        list_add_tail(&tx->txreq.list, &dd->ipath_sdma_activelist);
        if (tx->txreq.flags & IPATH_SDMA_TXREQ_F_VL15)
                vl15_watchdog_enq(dd);
-
+       goto unlock;
+
+unmap:
+       while (tail != dd->ipath_sdma_descq_tail) {
+               if (!tail)
+                       tail = dd->ipath_sdma_descq_cnt - 1;
+               else
+                       tail--;
+               unmap_desc(dd, tail);
+       }
+ioerr:
+       ret = -EIO;
 unlock:
        spin_unlock_irqrestore(&dd->ipath_sdma_lock, flags);
 fail: