mwifiex: return -EBUSY if scan request cannot be honored
There are cases we cannot scan when request is received. For example, during WPA group key negociation the scan request will be blocked. We should return an error code to cfg80211 because cfg80211_scan_done will never be called. Signed-off-by: NBing Zhao <bzhao@marvell.com> Signed-off-by: NAmitkumar Karwar <akarwar@marvell.com> Signed-off-by: NPaul Stewart <pstew@chromium.org> Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
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