firewire: Handle the last few DMA mapping error cases.

This should be the last missing checks.

Signed-off-by: Kristian Hoegsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

1 files changed, 26 insertions, 7 deletions

diff --git a/drivers/firewire/fw-sbp2.c b/drivers/firewire/fw-sbp2.c
index c6fd7d353685..c32254e94187 100644
--- a/drivers/firewire/fw-sbp2.c
+++ b/drivers/firewire/fw-sbp2.c
@@ -892,7 +892,7 @@ complete_command_orb(struct sbp2_orb *base_orb, struct sbp2_status *status)
         kfree(orb);
 }
 
-static void sbp2_command_orb_map_scatterlist(struct sbp2_command_orb *orb)
+static int sbp2_command_orb_map_scatterlist(struct sbp2_command_orb *orb)
 {
         struct sbp2_device *sd =
                 (struct sbp2_device *)orb->cmd->device->host->hostdata;
@@ -906,6 +906,8 @@ static void sbp2_command_orb_map_scatterlist(struct sbp2_command_orb *orb)
         sg = (struct scatterlist *)orb->cmd->request_buffer;
         count = dma_map_sg(device->card->device, sg, orb->cmd->use_sg,
                            orb->cmd->sc_data_direction);
+        if (count == 0)
+                goto fail;
 
         /*
          * Handle the special case where there is only one element in
@@ -919,7 +921,7 @@ static void sbp2_command_orb_map_scatterlist(struct sbp2_command_orb *orb)
                 orb->request.data_descriptor.low  = sg_dma_address(sg);
                 orb->request.misc |=
                         COMMAND_ORB_DATA_SIZE(sg_dma_len(sg));
-                return;
+                return 0;
         }
 
         /*
@@ -952,6 +954,8 @@ static void sbp2_command_orb_map_scatterlist(struct sbp2_command_orb *orb)
         orb->page_table_bus =
                 dma_map_single(device->card->device, orb->page_table,
                                size, DMA_TO_DEVICE);
+        if (dma_mapping_error(orb->page_table_bus))
+                goto fail_page_table;
         orb->request.data_descriptor.high = sd->address_high;
         orb->request.data_descriptor.low  = orb->page_table_bus;
         orb->request.misc |=
@@ -959,9 +963,17 @@ static void sbp2_command_orb_map_scatterlist(struct sbp2_command_orb *orb)
                 COMMAND_ORB_DATA_SIZE(j);
 
         fw_memcpy_to_be32(orb->page_table, orb->page_table, size);
+
+        return 0;
+
+ fail_page_table:
+        dma_unmap_sg(device->card->device, sg, orb->cmd->use_sg,
+                     orb->cmd->sc_data_direction);
+ fail:
+        return -ENOMEM;
 }
 
-static void sbp2_command_orb_map_buffer(struct sbp2_command_orb *orb)
+static int sbp2_command_orb_map_buffer(struct sbp2_command_orb *orb)
 {
         struct sbp2_device *sd =
                 (struct sbp2_device *)orb->cmd->device->host->hostdata;
@@ -978,10 +990,15 @@ static void sbp2_command_orb_map_buffer(struct sbp2_command_orb *orb)
                                orb->cmd->request_buffer,
                                orb->cmd->request_bufflen,
                                orb->cmd->sc_data_direction);
+        if (dma_mapping_error(orb->request_buffer_bus))
+                return -ENOMEM;
+
         orb->request.data_descriptor.high = sd->address_high;
         orb->request.data_descriptor.low  = orb->request_buffer_bus;
         orb->request.misc |=
                 COMMAND_ORB_DATA_SIZE(orb->cmd->request_bufflen);
+
+        return 0;
 }
 
 /* SCSI stack integration */
@@ -1042,7 +1059,8 @@ static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done)
                         COMMAND_ORB_DIRECTION(SBP2_DIRECTION_TO_MEDIA);
 
         if (cmd->use_sg) {
-                sbp2_command_orb_map_scatterlist(orb);
+                if (sbp2_command_orb_map_scatterlist(orb) < 0)
+                        goto fail_map_payload;
         } else if (cmd->request_bufflen > SBP2_MAX_SG_ELEMENT_LENGTH) {
                 /*
                  * FIXME: Need to split this into a sg list... but
@@ -1050,9 +1068,10 @@ static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done)
                  * reporting our max supported block size?
                  */
                 fw_error("command > 64k\n");
-                goto fail_bufflen;
+                goto fail_map_payload;
         } else if (cmd->request_bufflen > 0) {
-                sbp2_command_orb_map_buffer(orb);
+                if (sbp2_command_orb_map_buffer(orb) < 0)
+                        goto fail_map_payload;
         }
 
         fw_memcpy_to_be32(&orb->request, &orb->request, sizeof orb->request);
@@ -1068,7 +1087,7 @@ static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done)
 
         return 0;
 
- fail_bufflen:
+ fail_map_payload:
         dma_unmap_single(device->card->device, orb->base.request_bus,
                          sizeof orb->request, DMA_TO_DEVICE);
  fail_mapping: