Hello Jens,
Several block drivers call alloc_disk() followed by put_disk() if something
fails before device_add_disk() is called without calling blk_cleanup_queue().
Make sure that also for this scenario a request queue is dissociated from the
cgroup controller. This patch avoids that loading the parport_pc, paride and
pf drivers trigger a kernel crash. Since this patch series fixes a regression,
please consider these patches for kernel v4.19.
Thanks,
Bart.
Changes between v4 and v5:
- Instead of using #ifdef CONFIG_CGROUP / #endif, introduced a new function in
the cgroups code.
Changes between v3 and v4:
- Added "Cc: stable" tags.
Changes between v2 and v3:
- Avoid code duplication by introducing a new helper function.
Changes between v1 and v2:
- Fixed the build for CONFIG_BLK_CGROUP=n.
Bart Van Assche (3):
blkcg: Introduce blkg_root_lookup()
block: Introduce blk_exit_queue()
block: Ensure that a request queue is dissociated from the cgroup
controller
block/blk-core.c | 54 +++++++++++++++++++++-----------------
block/blk-sysfs.c | 15 +++++++++++
block/blk.h | 1 +
include/linux/blk-cgroup.h | 18 +++++++++++++
4 files changed, 64 insertions(+), 24 deletions(-)
--
2.18.0
