ide-taskfile: don't abuse rq->buffer

Impact: rq->buffer usage cleanup

ide_raw_taskfile() directly uses rq->buffer to carry pointer to the
data buffer.  This complicates both block interface and ide backend
request handling.  Use blk_rq_map_kern() instead and drop special
handling for REQ_TYPE_ATA_TASKFILE from ide_map_sg().

Note that REQ_RW setting is moved upwards as blk_rq_map_kern() uses it
to initialize bio rw flag.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index 35dc38d..9b9e8b1 100644 (file)
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -248,10 +248,7 @@ void ide_map_sg(ide_drive_t *drive, struct ide_cmd *cmd)
        struct scatterlist *sg = hwif->sg_table;
        struct request *rq = cmd->rq;
 
-       if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) {
-               sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE);
-               cmd->sg_nents = 1;
-       } else if (!rq->bio) {
+       if (!rq->bio) {
                sg_init_one(sg, rq->data, rq->data_len);
                cmd->sg_nents = 1;
        } else

diff --git a/drivers/ide/ide-taskfile.c b/drivers/ide/ide-taskfile.c
index 4aa6223..f400eb4 100644 (file)
--- a/drivers/ide/ide-taskfile.c
+++ b/drivers/ide/ide-taskfile.c
@@ -424,7 +424,9 @@ int ide_raw_taskfile(ide_drive_t *drive, struct ide_cmd *cmd, u8 *buf,
 
        rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
        rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
-       rq->buffer = buf;
+
+       if (cmd->tf_flags & IDE_TFLAG_WRITE)
+               rq->cmd_flags |= REQ_RW;
 
        /*
         * (ks) We transfer currently only whole sectors.
@@ -432,18 +434,20 @@ int ide_raw_taskfile(ide_drive_t *drive, struct ide_cmd *cmd, u8 *buf,
         * if we would find a solution to transfer any size.
         * To support special commands like READ LONG.
         */
-       rq->hard_nr_sectors = rq->nr_sectors = nsect;
-       rq->hard_cur_sectors = rq->current_nr_sectors = nsect;
-
-       if (cmd->tf_flags & IDE_TFLAG_WRITE)
-               rq->cmd_flags |= REQ_RW;
+       if (nsect) {
+               error = blk_rq_map_kern(drive->queue, rq, buf,
+                                       nsect * SECTOR_SIZE, __GFP_WAIT);
+               if (error)
+                       goto put_req;
+       }
 
        rq->special = cmd;
        cmd->rq = rq;
 
        error = blk_execute_rq(drive->queue, NULL, rq, 0);
-       blk_put_request(rq);
 
+put_req:
+       blk_put_request(rq);
        return error;
 }