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>

diff --git a/drivers/net/wireless/intel/iwlegacy/common.c b/drivers/net/wireless/intel/iwlegacy/common.c
index 140b6ea..8d5acda 100644 (file)
--- 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");

diff --git a/drivers/net/wireless/intel/iwlegacy/common.h b/drivers/net/wireless/intel/iwlegacy/common.h
index 3bba521..18c60c9 100644 (file)
--- a/drivers/net/wireless/intel/iwlegacy/common.h
+++ b/drivers/net/wireless/intel/iwlegacy/common.h
@@ -45,6 +45,7 @@ struct il_tx_queue;
 
 #define IL_ERR(f, a...) dev_err(&il->pci_dev->dev, f, ## a)
 #define IL_WARN(f, a...) dev_warn(&il->pci_dev->dev, f, ## a)
+#define IL_WARN_ONCE(f, a...) dev_warn_once(&il->pci_dev->dev, f, ## a)
 #define IL_INFO(f, a...) dev_info(&il->pci_dev->dev, f, ## a)
 
 #define RX_QUEUE_SIZE                         256