[SCSI] hpsa: fix dma unmap error in hpsa_passthru_ioctl

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index c6c0434..a75122d 100644 (file)
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -2580,7 +2580,8 @@ static int hpsa_passthru_ioctl(struct ctlr_info *h, void __user *argp)
                c->SG[0].Ext = 0; /* we are not chaining*/
        }
        hpsa_scsi_do_simple_cmd_core(h, c);
-       hpsa_pci_unmap(h->pdev, c, 1, PCI_DMA_BIDIRECTIONAL);
+       if (iocommand.buf_size > 0)
+               hpsa_pci_unmap(h->pdev, c, 1, PCI_DMA_BIDIRECTIONAL);
        check_ioctl_unit_attention(h, c);
 
        /* Copy the error information out */