rt2x00: check for dma mappings errors

Check output of dma_map_single functions which nowadays can fail (when
IOMMU is used). On write_beacon callbacks just print error, similar
like padding error is handled by rt2800_write_beacon.

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 9 insertions, 3 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2400pci.c b/drivers/net/wireless/rt2x00/rt2400pci.c
index a2d2bc2c7b3d..221beaaa83f1 100644
--- a/drivers/net/wireless/rt2x00/rt2400pci.c
+++ b/drivers/net/wireless/rt2x00/rt2400pci.c
@@ -1185,8 +1185,14 @@ static void rt2400pci_write_beacon(struct queue_entry *entry,
         rt2x00_set_field32(&reg, CSR14_BEACON_GEN, 0);
         rt2x00pci_register_write(rt2x00dev, CSR14, reg);
 
-        rt2x00queue_map_txskb(entry);
-
+        if (rt2x00queue_map_txskb(entry)) {
+                ERROR(rt2x00dev, "Fail to map beacon, aborting\n");
+                goto out;
+        }
+        /*
+         * Enable beaconing again.
+         */
+        rt2x00_set_field32(&reg, CSR14_BEACON_GEN, 1);
         /*
          * Write the TX descriptor for the beacon.
          */
@@ -1196,7 +1202,7 @@ static void rt2400pci_write_beacon(struct queue_entry *entry,
          * Dump beacon to userspace through debugfs.
          */
         rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_BEACON, entry->skb);
-
+out:
         /*
          * Enable beaconing again.
          */