[SCSI] ibmvscsi: Correct DMA mapping leak

The ibmvscsi client driver is not unmapping the SCSI command after
encountering a DMA mapping error while trying to map an indirect
scattergather list for the event pool.  This leads to a leak of DMA
entitlement that could result in the device failing future DMA operations
in a CMO environment.

Signed-off-by: Robert Jennings <rcj@linux.vnet.ibm.com>
Acked-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c
index 74d07d137daeb75b038071f6fe9a279b927243e1..c9aa7611e40824142534d21aa46fc4461936ba33 100644 (file)
--- a/drivers/scsi/ibmvscsi/ibmvscsi.c
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.c
@@ -432,6 +432,7 @@ static int map_sg_data(struct scsi_cmnd *cmd,
                                sdev_printk(KERN_ERR, cmd->device,
                                            "Can't allocate memory "
                                            "for indirect table\n");
+                       scsi_dma_unmap(cmd);
                        return 0;
                }
        }