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mtd: block2mtd: factor the early block device open logic into a helper

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Simplify add_device a bit by splitting out the cumbersome early boot logic
into a separate helper.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20230531125535.676098-23-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2023-05-31 14:55:33 +02:00 committed by Jens Axboe
parent 1e8c813b08
commit b2baa57475
1 changed files with 34 additions and 27 deletions
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61
drivers/mtd/devices/block2mtd.c
View file

@ -215,13 +215,42 @@ static void block2mtd_free_device(struct block2mtd_dev *dev)
kfree(dev);
}
static struct block_device *mdtblock_early_get_bdev(const char *devname,
fmode_t mode, int timeout, struct block2mtd_dev *dev)
{
struct block_device *bdev = ERR_PTR(-ENODEV);
#ifndef MODULE
int i;
/*
* We might not have the root device mounted at this point.
* Try to resolve the device name by other means.
*/
for (i = 0; i <= timeout; i++) {
dev_t devt;
if (i)
/*
* Calling wait_for_device_probe in the first loop
* was not enough, sleep for a bit in subsequent
* go-arounds.
*/
msleep(1000);
wait_for_device_probe();
if (!early_lookup_bdev(devname, &devt)) {
bdev = blkdev_get_by_dev(devt, mode, dev, NULL);
if (!IS_ERR(bdev))
break;
}
}
#endif
return bdev;
}
static struct block2mtd_dev *add_device(char *devname, int erase_size,
char *label, int timeout)
{
#ifndef MODULE
int i;
#endif
const fmode_t mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
struct block_device *bdev;
struct block2mtd_dev *dev;
@ -236,30 +265,8 @@ static struct block2mtd_dev *add_device(char *devname, int erase_size,
/* Get a handle on the device */
bdev = blkdev_get_by_path(devname, mode, dev, NULL);
#ifndef MODULE
/*
* We might not have the root device mounted at this point.
* Try to resolve the device name by other means.
*/
for (i = 0; IS_ERR(bdev) && i <= timeout; i++) {
dev_t devt;
if (i)
/*
* Calling wait_for_device_probe in the first loop
* was not enough, sleep for a bit in subsequent
* go-arounds.
*/
msleep(1000);
wait_for_device_probe();
if (early_lookup_bdev(devname, &devt))
continue;
bdev = blkdev_get_by_dev(devt, mode, dev, NULL);
}
#endif
if (IS_ERR(bdev))
bdev = mdtblock_early_get_bdev(devname, mode, timeout, dev);
if (IS_ERR(bdev)) {
pr_err("error: cannot open device %s\n", devname);
goto err_free_block2mtd;