[SCSI] st: Move buffer pointer back when data could not be written.

Move buffer pointer back when data could not be written. Bug found by
Mike Christie.

Signed-off-by: Kai Mäkisara <Kai.Makisara@kolumbus.fi>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index 4684cc716aa4..41b1f81b1651 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -17,7 +17,7 @@
    Last modified: 18-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
  */
 
-static const char *verstr = "20080224";
+static const char *verstr = "20080504";
 
 #include <linux/module.h>
 
@@ -1670,6 +1670,7 @@ st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
                                 if (undone <= do_count) {
                                         /* Only data from this write is not written */
                                         count += undone;
+                                        b_point -= undone;
                                         do_count -= undone;
                                         if (STp->block_size)
                                                 blks = (transfer - undone) / STp->block_size;