ide-cd: clear sense buffer before issuing request sense

Impact: code simplification

ide_cd_request_sense_fixup() clears the tail of the sense buffer if
the device didn't completely fill it.  This patch makes
cdrom_queue_request_sense() clear the sense buffer before issuing the
command instead of clearing it afterwards.  This simplifies code and
eases future changes.

Signed-off-by: Tejun Heo <tj@kernel.org>

diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index 3aec19d..509f129 100644 (file)
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -217,6 +217,8 @@ static void cdrom_queue_request_sense(ide_drive_t *drive, void *sense,
        if (sense == NULL)
                sense = &info->sense_data;
 
+       memset(sense, 0, 18);
+
        /* stuff the sense request in front of our current request */
        blk_rq_init(NULL, rq);
        rq->cmd_type = REQ_TYPE_ATA_PC;
@@ -504,14 +506,8 @@ static void ide_cd_request_sense_fixup(ide_drive_t *drive, struct ide_cmd *cmd)
         * and some drives don't send them.  Sigh.
         */
        if (rq->cmd[0] == GPCMD_REQUEST_SENSE &&
-           cmd->nleft > 0 && cmd->nleft <= 5) {
-               unsigned int ofs = cmd->nbytes - cmd->nleft;
-
-               while (cmd->nleft > 0) {
-                       *((u8 *)rq->data + ofs++) = 0;
-                       cmd->nleft--;
-               }
-       }
+           cmd->nleft > 0 && cmd->nleft <= 5)
+               cmd->nleft = 0;
 }
 
 int ide_cd_queue_pc(ide_drive_t *drive, const unsigned char *cmd,