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| author | Sebastian Ott <sebott@linux.vnet.ibm.com> | 2014-06-13 19:02:24 +0400 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2014-06-16 12:32:24 +0400 |
| commit | 9280ddb19489fa24e2d4f6f492d185ae1172bec2 (patch) | |
| tree | 7146a4e9891ae8d38f3741664e387bdd03e35ea3 | |
| parent | 613c4e0459603cc04384723b08fd62103b5eaaaf (diff) | |
| download | linux-9280ddb19489fa24e2d4f6f492d185ae1172bec2.tar.xz | |
s390/ccwgroup: obtain extra reference for asynchronous processing
Commit 0b60f9ead5d4816e7e3d6e28f4a0d22d4a1b2513
"s390: use device_remove_file_self() instead of device_schedule_callback()"
changed ccwgroup to use an extra work queue instead of
device_schedule_callback. This function obtained an extra device
reference for its async work which is missing in the new implementation
and results in a "freeing memory with a lock still held" BUG. Fix
this by obtaining an extra reference for the async work.
Reported-by: Stefan Raspl <raspl@linux.vnet.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| -rw-r--r-- | drivers/s390/cio/ccwgroup.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/s390/cio/ccwgroup.c b/drivers/s390/cio/ccwgroup.c index dfd7bc681c25..040e643746aa 100644 --- a/drivers/s390/cio/ccwgroup.c +++ b/drivers/s390/cio/ccwgroup.c @@ -227,6 +227,7 @@ static void ccwgroup_ungroup_workfn(struct work_struct *work) container_of(work, struct ccwgroup_device, ungroup_work); ccwgroup_ungroup(gdev); + put_device(&gdev->dev); } static void ccwgroup_release(struct device *dev) @@ -412,8 +413,10 @@ static int ccwgroup_notifier(struct notifier_block *nb, unsigned long action, { struct ccwgroup_device *gdev = to_ccwgroupdev(data); - if (action == BUS_NOTIFY_UNBIND_DRIVER) + if (action == BUS_NOTIFY_UNBIND_DRIVER) { + get_device(&gdev->dev); schedule_work(&gdev->ungroup_work); + } return NOTIFY_OK; } |