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iwlwifi: mvm: don't allow sched scans without matches to be started 

The firmware can perform a scheduled scan with not matchsets passed,
but it can't send notification that results were found.  Since the
userspace then cannot know when we got new results and the firmware
wouldn't trigger a wake in case we are sleeping, it's better not to
allow scans without matchsets.

This fixes https://bugzilla.kernel.org/show_bug.cgi?id=110831

Cc: <stable@vger.kernel.org> [3.17+]
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
This commit is contained in:
Luca Coelho 2016-02-02 15:11:15 +02:00 committed by Emmanuel Grumbach
parent 0ad4ece5bb
commit 5e56276e75
1 changed files with 4 additions and 0 deletions
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4
drivers/net/wireless/intel/iwlwifi/mvm/scan.c
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@ -1298,6 +1298,10 @@ int iwl_mvm_sched_scan_start(struct iwl_mvm *mvm,
return -EBUSY;
}
/* we don't support "match all" in the firmware */
if (!req->n_match_sets)
return -EOPNOTSUPP;
ret = iwl_mvm_check_running_scans(mvm, type);
if (ret)
return ret;