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| author | Tejun Heo <htejun@gmail.com> | 2007-11-08 08:00:24 +0100 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2007-11-08 08:00:24 +0100 |
| commit | fffe487d59ba4017c7c62b06667ca4a226cee651 (patch) | |
| tree | e7473f6bc2406c1f20119a2d5532d7ec2655bdb6 /drivers/block/pktcdvd.c | |
| parent | 8ec680e4c3ec818efd1652f15199ed1c216ab550 (diff) | |
| download | lwn-fffe487d59ba4017c7c62b06667ca4a226cee651.tar.gz lwn-fffe487d59ba4017c7c62b06667ca4a226cee651.zip | |
pktcdvd: fix BUG caused by sysfs module reference semantics change
pkt_setup_dev() expects module reference to be held on invocation.
This used to be true for sysfs callbacks but not anymore. Test and
grab module reference around pkt_setup_dev() in
class_pktcdvd_store_add().
Signed-off-by: Tejun Heo <htejun@gmail.com>
Acked-by: Peter Osterlund <petero2@telia.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'drivers/block/pktcdvd.c')
| -rw-r--r-- | drivers/block/pktcdvd.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c index a8130a4ad6d4..a5ee21319d37 100644 --- a/drivers/block/pktcdvd.c +++ b/drivers/block/pktcdvd.c @@ -358,10 +358,19 @@ static ssize_t class_pktcdvd_store_add(struct class *c, const char *buf, size_t count) { unsigned int major, minor; + if (sscanf(buf, "%u:%u", &major, &minor) == 2) { + /* pkt_setup_dev() expects caller to hold reference to self */ + if (!try_module_get(THIS_MODULE)) + return -ENODEV; + pkt_setup_dev(MKDEV(major, minor), NULL); + + module_put(THIS_MODULE); + return count; } + return -EINVAL; } |