iwlegacy: warn when enabling power save

iwlegacy firmware can crash when power save is configured. PS was
allowed in "dbdac2b iwlegacy: properly enable power saving" with belive
that user who enable PS is aware of that and can relate firmware crahes
with PS. However some distributions seems to enable PS without user
intervention, so warn about that.

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/net/wireless/intel/iwlegacy/common.c b/drivers/net/wireless/intel/iwlegacy/common.c
index 140b6ea8f7cc..8d5acda92a9b 100644
--- a/drivers/net/wireless/intel/iwlegacy/common.c
+++ b/drivers/net/wireless/intel/iwlegacy/common.c
@@ -5147,6 +5147,8 @@ set_ch_out:
 
         if (changed & (IEEE80211_CONF_CHANGE_PS | IEEE80211_CONF_CHANGE_IDLE)) {
                 il->power_data.ps_disabled = !(conf->flags & IEEE80211_CONF_PS);
+                if (!il->power_data.ps_disabled)
+                        IL_WARN_ONCE("Enabling power save might cause firmware crashes\n");
                 ret = il_power_update_mode(il, false);
                 if (ret)
                         D_MAC80211("Error setting sleep level\n");