ath9k: use per-device struct for pm_qos_* operations

The ath9k driver uses a shared pm_qos_request_list structure for all
devices. This causes the following warning if more than one device is
present in the system:

WARNING: at kernel/pm_qos_params.c:234 ath9k_init_device+0x5e8/0x6b0()
pm_qos_add_request() called for already added request
Modules linked in:
Call Trace:
[<802b1cdc>] dump_stack+0x8/0x34
[<8007dd90>] warn_slowpath_common+0x78/0xa4
[<8007de44>] warn_slowpath_fmt+0x2c/0x38
[<801b0828>] ath9k_init_device+0x5e8/0x6b0
[<801bc508>] ath_pci_probe+0x2dc/0x39c
[<80176254>] pci_device_probe+0x64/0xa4
[<8019471c>] driver_probe_device+0xbc/0x188
[<80194854>] __driver_attach+0x6c/0xa4
[<80193e20>] bus_for_each_dev+0x60/0xb0
[<80193580>] bus_add_driver+0xcc/0x268
[<80194c08>] driver_register+0xe0/0x198
[<801764e0>] __pci_register_driver+0x50/0xe0
[<80365f48>] ath9k_init+0x3c/0x6c
[<8006050c>] do_one_initcall+0xfc/0x1d8
[<80355340>] kernel_init+0xd4/0x174
[<800639a4>] kernel_thread_helper+0x10/0x18

---[ end trace 5345fc6f870564a6 ]---

This patch fixes that warning by using a separate pm_qos_request_list
sructure for each device.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

3 files changed, 7 insertions, 9 deletions

diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index 170d44a35ccb..0d0bec3628ec 100644
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -21,6 +21,7 @@
 #include <linux/device.h>
 #include <linux/leds.h>
 #include <linux/completion.h>
+#include <linux/pm_qos_params.h>
 
 #include "debug.h"
 #include "common.h"
@@ -646,6 +647,8 @@ struct ath_softc {
         struct ath_descdma txsdma;
 
         struct ath_ant_comb ant_comb;
+
+        struct pm_qos_request_list pm_qos_req;
 };
 
 struct ath_wiphy {
@@ -675,7 +678,6 @@ static inline void ath_read_cachesize(struct ath_common *common, int *csz)
 }
 
 extern struct ieee80211_ops ath9k_ops;
-extern struct pm_qos_request_list ath9k_pm_qos_req;
 extern int modparam_nohwcrypt;
 extern int led_blink;
 
diff --git a/drivers/net/wireless/ath/ath9k/init.c b/drivers/net/wireless/ath/ath9k/init.c
index 92bc5c5f4876..c29eea26a777 100644
--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c
@@ -15,7 +15,6 @@
  */
 
 #include <linux/slab.h>
-#include <linux/pm_qos_params.h>
 
 #include "ath9k.h"
 
@@ -180,8 +179,6 @@ static const struct ath_ops ath9k_common_ops = {
         .write = ath9k_iowrite32,
 };
 
-struct pm_qos_request_list ath9k_pm_qos_req;
-
 /**************************/
 /*     Initialization     */
 /**************************/
@@ -759,7 +756,7 @@ int ath9k_init_device(u16 devid, struct ath_softc *sc, u16 subsysid,
         ath_init_leds(sc);
         ath_start_rfkill_poll(sc);
 
-        pm_qos_add_request(&ath9k_pm_qos_req, PM_QOS_CPU_DMA_LATENCY,
+        pm_qos_add_request(&sc->pm_qos_req, PM_QOS_CPU_DMA_LATENCY,
                            PM_QOS_DEFAULT_VALUE);
 
         return 0;
@@ -830,7 +827,7 @@ void ath9k_deinit_device(struct ath_softc *sc)
         }
 
         ieee80211_unregister_hw(hw);
-        pm_qos_remove_request(&ath9k_pm_qos_req);
+        pm_qos_remove_request(&sc->pm_qos_req);
         ath_rx_cleanup(sc);
         ath_tx_cleanup(sc);
         ath9k_deinit_softc(sc);
diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index 25d3ef4c338e..1cdbdbe33ab5 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -15,7 +15,6 @@
  */
 
 #include <linux/nl80211.h>
-#include <linux/pm_qos_params.h>
 #include "ath9k.h"
 #include "btcoex.h"
 
@@ -1244,7 +1243,7 @@ static int ath9k_start(struct ieee80211_hw *hw)
                         ath9k_btcoex_timer_resume(sc);
         }
 
-        pm_qos_update_request(&ath9k_pm_qos_req, 55);
+        pm_qos_update_request(&sc->pm_qos_req, 55);
 
 mutex_unlock:
         mutex_unlock(&sc->mutex);
@@ -1423,7 +1422,7 @@ static void ath9k_stop(struct ieee80211_hw *hw)
 
         sc->sc_flags |= SC_OP_INVALID;
 
-        pm_qos_update_request(&ath9k_pm_qos_req, PM_QOS_DEFAULT_VALUE);
+        pm_qos_update_request(&sc->pm_qos_req, PM_QOS_DEFAULT_VALUE);
 
         mutex_unlock(&sc->mutex);