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| author | Alexandra Winter <wintera@linux.ibm.com> | 2021-09-21 16:52:17 +0200 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2021-09-21 20:02:24 -0700 |
| commit | d2b59bd4b06d84a4eadb520b0f71c62fe8ec0a62 (patch) | |
| tree | 7e5fe772eed361a7afc9e9f0accc14e1e8a05841 /block/blk-mq-debugfs.h | |
| parent | ee909d0b1dac8632eeb78cbf17661d6c7674bbd0 (diff) | |
| download | linux-d2b59bd4b06d84a4eadb520b0f71c62fe8ec0a62.tar.bz2 | |
s390/qeth: fix deadlock during failing recovery
Commit 0b9902c1fcc5 ("s390/qeth: fix deadlock during recovery") removed
taking discipline_mutex inside qeth_do_reset(), fixing potential
deadlocks. An error path was missed though, that still takes
discipline_mutex and thus has the original deadlock potential.
Intermittent deadlocks were seen when a qeth channel path is configured
offline, causing a race between qeth_do_reset and ccwgroup_remove.
Call qeth_set_offline() directly in the qeth_do_reset() error case and
then a new variant of ccwgroup_set_offline(), without taking
discipline_mutex.
Fixes: b41b554c1ee7 ("s390/qeth: fix locking for discipline setup / removal")
Signed-off-by: Alexandra Winter <wintera@linux.ibm.com>
Reviewed-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'block/blk-mq-debugfs.h')
0 files changed, 0 insertions, 0 deletions