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author | Mikulas Patocka <mpatocka@redhat.com> | 2014-01-14 00:37:54 (GMT) |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-02-13 21:50:22 (GMT) |
commit | 1a46dbe17b9771a38d702143d7e03b86e4377f7e (patch) | |
tree | 71f0749d681ec18e1ebd6082889b9353554f14b8 /README | |
parent | aecead3a1e5cf7698854f1c47e725e808212de61 (diff) | |
download | linux-fsl-qoriq-1a46dbe17b9771a38d702143d7e03b86e4377f7e.tar.xz |
dm sysfs: fix a module unload race
commit 2995fa78e423d7193f3b57835f6c1c75006a0315 upstream.
This reverts commit be35f48610 ("dm: wait until embedded kobject is
released before destroying a device") and provides an improved fix.
The kobject release code that calls the completion must be placed in a
non-module file, otherwise there is a module unload race (if the process
calling dm_kobject_release is preempted and the DM module unloaded after
the completion is triggered, but before dm_kobject_release returns).
To fix this race, this patch moves the completion code to dm-builtin.c
which is always compiled directly into the kernel if BLK_DEV_DM is
selected.
The patch introduces a new dm_kobject_holder structure, its purpose is
to keep the completion and kobject in one place, so that it can be
accessed from non-module code without the need to export the layout of
struct mapped_device to that code.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'README')
0 files changed, 0 insertions, 0 deletions