diff options
| -rw-r--r-- | drivers/scsi/st.c | 15 |
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); |