[SCSI] aic79xx: fix IOMMU mapping failure handling

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

diff --git a/drivers/scsi/aic7xxx/aic79xx_osm.c b/drivers/scsi/aic7xxx/aic79xx_osm.c
index 72fccd9..0081aa3 100644 (file)
--- a/drivers/scsi/aic7xxx/aic79xx_osm.c
+++ b/drivers/scsi/aic7xxx/aic79xx_osm.c
@@ -1413,6 +1413,10 @@ ahd_linux_run_command(struct ahd_softc *ahd, struct ahd_linux_device *dev,
        unsigned long flags;
        int nseg;
 
+       nseg = scsi_dma_map(cmd);
+       if (nseg < 0)
+               return SCSI_MLQUEUE_HOST_BUSY;
+
        ahd_lock(ahd, &flags);
 
        /*
@@ -1430,6 +1434,7 @@ ahd_linux_run_command(struct ahd_softc *ahd, struct ahd_linux_device *dev,
        if ((scb = ahd_get_scb(ahd, col_idx)) == NULL) {
                ahd->flags |= AHD_RESOURCE_SHORTAGE;
                ahd_unlock(ahd, &flags);
+               scsi_dma_unmap(cmd);
                return SCSI_MLQUEUE_HOST_BUSY;
        }
 
@@ -1485,8 +1490,6 @@ ahd_linux_run_command(struct ahd_softc *ahd, struct ahd_linux_device *dev,
        ahd_set_sense_residual(scb, 0);
        scb->sg_count = 0;
 
-       nseg = scsi_dma_map(cmd);
-       BUG_ON(nseg < 0);
        if (nseg > 0) {
                void *sg = scb->sg_list;
                struct scatterlist *cur_seg;