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pktcdvd: use blkdev_get_by_dev instead of open coding it

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Replace bdget + blkdev_get by blkdev_get_by_dev.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2020-09-21 09:19:49 +02:00 committed by Jens Axboe
parent 2d9e28a9a1
commit b8d954849c
1 changed files with 11 additions and 14 deletions
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25
drivers/block/pktcdvd.c
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@ -2110,16 +2110,18 @@ static int pkt_open_dev(struct pktcdvd_device *pd, fmode_t write)
int ret;
long lba;
struct request_queue *q;
struct block_device *bdev;
/*
* We need to re-open the cdrom device without O_NONBLOCK to be able
* to read/write from/to it. It is already opened in O_NONBLOCK mode
* so bdget() can't fail.
* so open should not fail.
*/
bdget(pd->bdev->bd_dev);
ret = blkdev_get(pd->bdev, FMODE_READ | FMODE_EXCL, pd);
if (ret)
bdev = blkdev_get_by_dev(pd->bdev->bd_dev, FMODE_READ | FMODE_EXCL, pd);
if (IS_ERR(bdev)) {
ret = PTR_ERR(bdev);
goto out;
}
ret = pkt_get_last_written(pd, &lba);
if (ret) {
@ -2163,7 +2165,7 @@ static int pkt_open_dev(struct pktcdvd_device *pd, fmode_t write)
return 0;
out_putdev:
blkdev_put(pd->bdev, FMODE_READ | FMODE_EXCL);
blkdev_put(bdev, FMODE_READ | FMODE_EXCL);
out:
return ret;
}
@ -2500,7 +2502,6 @@ static int pkt_seq_show(struct seq_file *m, void *p)
static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev)
{
int i;
int ret = 0;
char b[BDEVNAME_SIZE];
struct block_device *bdev;
@ -2523,12 +2524,9 @@ static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev)
}
}
bdev = bdget(dev);
if (!bdev)
return -ENOMEM;
ret = blkdev_get(bdev, FMODE_READ | FMODE_NDELAY, NULL);
if (ret)
return ret;
bdev = blkdev_get_by_dev(dev, FMODE_READ | FMODE_NDELAY, NULL);
if (IS_ERR(bdev))
return PTR_ERR(bdev);
if (!blk_queue_scsi_passthrough(bdev_get_queue(bdev))) {
blkdev_put(bdev, FMODE_READ | FMODE_NDELAY);
return -EINVAL;
@ -2546,7 +2544,6 @@ static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev)
pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->name);
if (IS_ERR(pd->cdrw.thread)) {
pkt_err(pd, "can't start kernel thread\n");
ret = -ENOMEM;
goto out_mem;
}
@ -2558,7 +2555,7 @@ out_mem:
blkdev_put(bdev, FMODE_READ | FMODE_NDELAY);
/* This is safe: open() is still holding a reference. */
module_put(THIS_MODULE);
return ret;
return -ENOMEM;
}
static int pkt_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg)