[PATCH 05/30] pcd: use blk_mq_alloc_disk

Christoph Hellwig
2021-06-02T07:02:02Z

Use the blk_mq_alloc_disk API to simplify the gendisk and request_queue
allocation.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
drivers/block/paride/pcd.c | 19 ++++++++-----------
1 file changed, 8 insertions(+), 11 deletions(-)

diff --git a/drivers/block/paride/pcd.c b/drivers/block/paride/pcd.c
index 70da8b86ce58..f9cdd11f02f5 100644
--- a/drivers/block/paride/pcd.c
+++ b/drivers/block/paride/pcd.c
@@ -309,21 +309,19 @@ static void pcd_init_units(void)

pcd_drive_count = 0;
for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) {
- struct gendisk *disk = alloc_disk(1);
+ struct gendisk *disk;

- if (!disk)
+ if (blk_mq_alloc_sq_tag_set(&cd->tag_set, &pcd_mq_ops, 1,
+ BLK_MQ_F_SHOULD_MERGE))
continue;

- disk->queue = blk_mq_init_sq_queue(&cd->tag_set, &pcd_mq_ops,
- 1, BLK_MQ_F_SHOULD_MERGE);
- if (IS_ERR(disk->queue)) {
- disk->queue = NULL;
- put_disk(disk);
+ disk = blk_mq_alloc_disk(&cd->tag_set, cd);
+ if (IS_ERR(disk)) {
+ blk_mq_free_tag_set(&cd->tag_set);
continue;
}

INIT_LIST_HEAD(&cd->rq_list);
- disk->queue->queuedata = cd;
blk_queue_bounce_limit(disk->queue, BLK_BOUNCE_HIGH);
cd->disk = disk;
cd->pi = &cd->pia;
@@ -343,6 +341,7 @@ static void pcd_init_units(void)
cd->info.mask = 0;
disk->major = major;
disk->first_minor = unit;
+ disk->minors = 1;
strcpy(disk->disk_name, cd->name); /* umm... */
disk->fops = &pcd_bdops;
disk->flags = GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE;
@@ -759,10 +758,8 @@ static int pcd_detect(void)
for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) {
if (!cd->disk)
continue;
- blk_cleanup_queue(cd->disk->queue);
- cd->disk->queue = NULL;
+ blk_cleanup_disk(cd->disk);
blk_mq_free_tag_set(&cd->tag_set);
- put_disk(cd->disk);
}
pi_unregister_driver(par_drv);
return -1;