iwlwifi: pcie: fix TX queue locking

When updating the write pointer, the TX queue should be locked
to get consistent state, fix that in the interrupt handler.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/net/wireless/iwlwifi/pcie/rx.c b/drivers/net/wireless/iwlwifi/pcie/rx.c
index 57e98cca4e97..152c763082b4 100644
--- a/drivers/net/wireless/iwlwifi/pcie/rx.c
+++ b/drivers/net/wireless/iwlwifi/pcie/rx.c
@@ -1042,8 +1042,11 @@ irqreturn_t iwl_pcie_irq_handler(int irq, void *dev_id)
         if (inta & CSR_INT_BIT_WAKEUP) {
                 IWL_DEBUG_ISR(trans, "Wakeup interrupt\n");
                 iwl_pcie_rxq_check_wrptr(trans);
-                for (i = 0; i < trans->cfg->base_params->num_of_queues; i++)
+                for (i = 0; i < trans->cfg->base_params->num_of_queues; i++) {
+                        spin_lock(&trans_pcie->txq[i].lock);
                         iwl_pcie_txq_inc_wr_ptr(trans, &trans_pcie->txq[i]);
+                        spin_unlock(&trans_pcie->txq[i].lock);
+                }
 
                 isr_stats->wakeup++;