commit 40cdc840dc337cb17d81bcf028b40834e78c1038
author Jenx Axboe <axboe@suse.de> Sun Feb 05 16:36:23 2006 +0100
committer <jejb@mulgrave.il.steeleye.com> Sun Feb 05 12:59:29 2006 -0600
tree 6d8bb794620cfe0c1daf3d35cb7ac8ab5d95ebf9
parent f9876f0b67c3f0b04ee2167602df54e7ae139ad7

[SCSI] gdth: don't map zero-length requests

Don't map zero-length requests in gdth, zome architectures don't like
that in their dma mapping routines.

[ I'm pretty sure Jens posted this before, but for some reason it got
  forgotten  --hch ]

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/gdth.c

diff --git a/drivers/scsi/gdth.c b/drivers/scsi/gdth.c
index bd3ffdf..62e3cda 100644
--- a/drivers/scsi/gdth.c
+++ b/drivers/scsi/gdth.c
@@ -2816,7 +2816,7 @@
             }
 #endif
 
-        } else {
+        } else if (scp->request_bufflen) {
             scp->SCp.Status = GDTH_MAP_SINGLE;
             scp->SCp.Message = (read_write == 1 ? 
                 PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);