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iwlwifi: fix scan races

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When an internal scan is started, nothing protects the
is_internal_short_scan variable which can cause crashes,
cf. https://bugzilla.kernel.org/show_bug.cgi?id=15667.
Fix this by making the short scan request use the mutex
for locking, which requires making the request go to a
work struct so that it can sleep.

Reported-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
This commit is contained in:
Johannes Berg
2010-04-07 00:21:36 -07:00
committed by Reinette Chatre
parent 8b9fce7773
commit 88be026490
5 changed files with 23 additions and 13 deletions
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drivers/net/wireless/iwlwifi/iwl-dev.h
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@@ -1296,6 +1296,7 @@ struct iwl_priv {
struct work_struct tt_work;
struct work_struct ct_enter;
struct work_struct ct_exit;
struct work_struct start_internal_scan;
struct tasklet_struct irq_tasklet;