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EDAC: Fix workqueue-related crashes

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00740c58541b6087d78418cebca1fcb86dc6077d changed edac_core to
un-/register a workqueue item only if a lowlevel driver supplies a
polling routine. Normally, when we remove a polling low-level driver, we
go and cancel all the queued work. However, the workqueue unreg happens
based on the ->op_state setting, and edac_mc_del_mc() sets this to
OP_OFFLINE _before_ we cancel the work item, leading to NULL ptr oops on
the workqueue list.

Fix it by putting the unreg stuff in proper order.

Cc: <stable@kernel.org> #36.x
Reported-and-tested-by: Tobias Karnat <tobias.karnat@googlemail.com>
LKML-Reference: <1291201307.3029.21.camel@Tobias-Karnat>
Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
This commit is contained in:
Borislav Petkov 2010-12-02 17:48:35 +01:00
parent cf7d7e5a19
commit bb31b3122c
1 changed files with 6 additions and 4 deletions
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10
drivers/edac/edac_mc.c
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@ -586,14 +586,16 @@ struct mem_ctl_info *edac_mc_del_mc(struct device *dev)
return NULL;
}
/* marking MCI offline */
mci->op_state = OP_OFFLINE;
del_mc_from_global_list(mci);
mutex_unlock(&mem_ctls_mutex);
/* flush workq processes and remove sysfs */
/* flush workq processes */
edac_mc_workq_teardown(mci);
/* marking MCI offline */
mci->op_state = OP_OFFLINE;
/* remove from sysfs */
edac_remove_sysfs_mci_device(mci);
edac_printk(KERN_INFO, EDAC_MC,