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-rw-r--r--drivers/scsi/st.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index 26e13dc7bcd..2096d137f5e 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -511,9 +511,11 @@ st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd
if (scsi_execute_async(STp->device, cmd, direction,
&((STp->buffer)->sg[0]), bytes, (STp->buffer)->sg_segs,
- timeout, retries, SRpnt, st_sleep_done, GFP_KERNEL))
+ timeout, retries, SRpnt, st_sleep_done, GFP_KERNEL)) {
/* could not allocate the buffer or request was too large */
(STp->buffer)->syscall_result = (-EBUSY);
+ (STp->buffer)->last_SRpnt = NULL;
+ }
else if (do_wait) {
wait_for_completion(waiting);
SRpnt->waiting = NULL;
@@ -1449,14 +1451,15 @@ static int setup_buffering(struct scsi_tape *STp, const char __user *buf,
/* Can be called more than once after each setup_buffer() */
-static void release_buffering(struct scsi_tape *STp)
+static void release_buffering(struct scsi_tape *STp, int is_read)
{
struct st_buffer *STbp;
STbp = STp->buffer;
if (STbp->do_dio) {
- sgl_unmap_user_pages(&(STbp->sg[0]), STbp->do_dio, 0);
+ sgl_unmap_user_pages(&(STbp->sg[0]), STbp->do_dio, is_read);
STbp->do_dio = 0;
+ STbp->sg_segs = 0;
}
}
@@ -1729,7 +1732,7 @@ st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
out:
if (SRpnt != NULL)
st_release_request(SRpnt);
- release_buffering(STp);
+ release_buffering(STp, 0);
up(&STp->lock);
return retval;
@@ -1787,7 +1790,7 @@ static long read_tape(struct scsi_tape *STp, long count,
SRpnt = *aSRpnt;
SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE,
STp->device->timeout, MAX_RETRIES, 1);
- release_buffering(STp);
+ release_buffering(STp, 1);
*aSRpnt = SRpnt;
if (!SRpnt)
return STbp->syscall_result;
@@ -2058,7 +2061,7 @@ st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
SRpnt = NULL;
}
if (do_dio) {
- release_buffering(STp);
+ release_buffering(STp, 1);
STbp->buffer_bytes = 0;
}
up(&STp->lock);