iwlwifi: don't access the HW when it is not available

[profile/ivi/kernel-adaptation-intel-automotive.git] / drivers / net / wireless / iwlwifi / pcie / rx.c

diff --git a/drivers/net/wireless/iwlwifi/pcie/rx.c b/drivers/net/wireless/iwlwifi/pcie/rx.c
index 7fc3821..6d71f51 100644 (file)
--- a/drivers/net/wireless/iwlwifi/pcie/rx.c
+++ b/drivers/net/wireless/iwlwifi/pcie/rx.c
@@ -203,6 +203,17 @@ static void iwl_rx_queue_restock(struct iwl_trans *trans)
        struct iwl_rx_mem_buffer *rxb;
        unsigned long flags;
 
+       /*
+        * If the device isn't enabled - not need to try to add buffers...
+        * This can happen when we stop the device and still have an interrupt
+        * pending. We stop the APM before we sync the interrupts / tasklets
+        * because we have to (see comment there). On the other hand, since
+        * the APM is stopped, we cannot access the HW (in particular not prph).
+        * So don't try to restock if the APM has been already stopped.
+        */
+       if (!test_bit(STATUS_DEVICE_ENABLED, &trans_pcie->status))
+               return;
+
        spin_lock_irqsave(&rxq->lock, flags);
        while ((iwl_rx_queue_space(rxq) > 0) && (rxq->free_count)) {
                /* The overwritten rxb must be a used one */