[PATCH 05/14] pktcdvd: use blkdev_get_by_dev instead of open coding it

[Christoph Hellwig]

Replace bdget + blkdev_get by blkdev_get_by_dev.

Signed-off-by: Christoph Hellwig <h...@lst.de>
---
 drivers/block/pktcdvd.c | 25 +++++++++++--------------
 1 file changed, 11 insertions(+), 14 deletions(-)

diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index bc870a5f15f77b..467dbd06b7cdb1 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -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 @@ static int pkt_new_dev(struct pktcdvd_device *pd, dev_t 
dev)
        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)
-- 
2.28.0