diff options
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/sd.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index d8e2caf9f46..365024b0c40 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -1188,6 +1188,12 @@ static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd) u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512); u64 bad_lba; int info_valid; + /* + * resid is optional but mostly filled in. When it's unused, + * its value is zero, so we assume the whole buffer transferred + */ + unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd); + unsigned int good_bytes; if (scmd->request->cmd_type != REQ_TYPE_FS) return 0; @@ -1221,7 +1227,8 @@ static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd) /* This computation should always be done in terms of * the resolution of the device's medium. */ - return (bad_lba - start_lba) * scmd->device->sector_size; + good_bytes = (bad_lba - start_lba) * scmd->device->sector_size; + return min(good_bytes, transferred); } /** |