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authorTejun Heo <htejun@gmail.com>2007-11-08 08:00:24 +0100
committerJens Axboe <jens.axboe@oracle.com>2007-11-08 08:00:24 +0100
commitfffe487d59ba4017c7c62b06667ca4a226cee651 (patch)
treee7473f6bc2406c1f20119a2d5532d7ec2655bdb6 /drivers/block/pktcdvd.c
parent8ec680e4c3ec818efd1652f15199ed1c216ab550 (diff)
downloadop-kernel-dev-fffe487d59ba4017c7c62b06667ca4a226cee651.zip
op-kernel-dev-fffe487d59ba4017c7c62b06667ca4a226cee651.tar.gz
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.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index a8130a4..a5ee213 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;
}
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