diff options
| author | Ben Hutchings <bhutchings@solarflare.com> | 2010-01-29 20:59:53 +0000 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2010-02-25 12:40:19 +0000 |
| commit | 4d3a8534bdbcf4843fc8ad05c9a81a964fc65237 (patch) | |
| tree | b019c9174a67fb23159fd4211baf099bf7a2e2a6 | |
| parent | b520e412faaaad35641aeedd6059179f9f1b393c (diff) | |
| download | linux-4d3a8534bdbcf4843fc8ad05c9a81a964fc65237.tar.bz2 | |
mtd: Raise limit on block device minor numbers
add_mtd_blktrans_dev() imposes a maximum of 257 devices per block
translator. This was presumably meant to prevent overflow back in the
days of 8-bit minor numbers. Instead, check against MINORMASK and the
limits of the partition naming scheme.
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| -rw-r--r-- | drivers/mtd/mtd_blkdevs.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c index 85a52b3c7698..2f8c202dbd86 100644 --- a/drivers/mtd/mtd_blkdevs.c +++ b/drivers/mtd/mtd_blkdevs.c @@ -242,9 +242,12 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new) if (new->devnum == -1) new->devnum = last_devnum+1; - if ((new->devnum << tr->part_bits) > 256) { + /* Check that the device and any partitions will get valid + * minor numbers and that the disk naming code below can cope + * with this number. */ + if (new->devnum > (MINORMASK >> tr->part_bits) || + (tr->part_bits && new->devnum >= 27 * 26)) return -EBUSY; - } list_add_tail(&new->list, &tr->devs); added: |