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

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commit 5e56276e75 upstream.

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

Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Luca Coelho
2016-02-02 15:11:15 +02:00
committed by Greg Kroah-Hartman
parent 3beb469074
commit 74e5797640
1 changed files with 4 additions and 0 deletions
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4
drivers/net/wireless/iwlwifi/mvm/scan.c
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@@ -1267,6 +1267,10 @@ 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;