carl9170: fix sleep in softirq context

This patch fixes the following bug:

usb 1-1.1: restart device (8)
BUG: sleeping function called from invalid context at drivers/usb/core/urb.c:654
in_atomic(): 1, irqs_disabled(): 0, pid: 0, name: swapper
 (usb_poison_urb+0x1c/0xf8)
 (usb_poison_anchored_urbs+0x48/0x78)
 (carl9170_usb_handle_tx_err+0x128/0x150)
 (carl9170_usb_reset+0xc/0x20)
 (carl9170_handle_command_response+0x298/0xea8)
 (carl9170_usb_tasklet+0x68/0x184)
 (tasklet_hi_action+0x84/0xdc)

this only happens if the device is plugged in an USB port,
the driver is loaded but inactive (e.g. the wlan interface
is down). If the device is active everything is fine.

Signed-off-by: Ronald Wahl <ronald.wahl@raritan.com>
Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 15 insertions, 15 deletions

diff --git a/drivers/net/wireless/ath/carl9170/carl9170.h b/drivers/net/wireless/ath/carl9170/carl9170.h
index 2aa4a59c72c8..2df17f1e49ef 100644
--- a/drivers/net/wireless/ath/carl9170/carl9170.h
+++ b/drivers/net/wireless/ath/carl9170/carl9170.h
@@ -303,6 +303,7 @@ struct ar9170 {
         unsigned long queue_stop_timeout[__AR9170_NUM_TXQ];
         unsigned long max_queue_stop_timeout[__AR9170_NUM_TXQ];
         bool needs_full_reset;
+        bool force_usb_reset;
         atomic_t pending_restarts;
 
         /* interface mode settings */
diff --git a/drivers/net/wireless/ath/carl9170/main.c b/drivers/net/wireless/ath/carl9170/main.c
index 67997b39aba7..25a1e2f4f738 100644
--- a/drivers/net/wireless/ath/carl9170/main.c
+++ b/drivers/net/wireless/ath/carl9170/main.c
@@ -465,27 +465,26 @@ static void carl9170_restart_work(struct work_struct *work)
 {
         struct ar9170 *ar = container_of(work, struct ar9170,
                                          restart_work);
-        int err;
+        int err = -EIO;
 
         ar->usedkeys = 0;
         ar->filter_state = 0;
         carl9170_cancel_worker(ar);
 
         mutex_lock(&ar->mutex);
-        err = carl9170_usb_restart(ar);
-        if (net_ratelimit()) {
-                if (err) {
-                        dev_err(&ar->udev->dev, "Failed to restart device "
-                                " (%d).\n", err);
-                 } else {
-                        dev_info(&ar->udev->dev, "device restarted "
-                                 "successfully.\n");
+        if (!ar->force_usb_reset) {
+                err = carl9170_usb_restart(ar);
+                if (net_ratelimit()) {
+                        if (err)
+                                dev_err(&ar->udev->dev, "Failed to restart device (%d).\n", err);
+                        else
+                                dev_info(&ar->udev->dev, "device restarted successfully.\n");
                 }
         }
-
         carl9170_zap_queues(ar);
         mutex_unlock(&ar->mutex);
-        if (!err) {
+
+        if (!err && !ar->force_usb_reset) {
                 ar->restart_counter++;
                 atomic_set(&ar->pending_restarts, 0);
 
@@ -526,10 +525,10 @@ void carl9170_restart(struct ar9170 *ar, const enum carl9170_restart_reasons r)
         if (!ar->registered)
                 return;
 
-        if (IS_ACCEPTING_CMD(ar) && !ar->needs_full_reset)
-                ieee80211_queue_work(ar->hw, &ar->restart_work);
-        else
-                carl9170_usb_reset(ar);
+        if (!IS_ACCEPTING_CMD(ar) || ar->needs_full_reset)
+                ar->force_usb_reset = true;
+
+        ieee80211_queue_work(ar->hw, &ar->restart_work);
 
         /*
          * At this point, the device instance might have vanished/disabled.