Jiri Kosina <jikos@xxxxxxxxxx> wrote:
> From: Jiri Kosina <jkosina@xxxxxxx>
>
> Analogically to what we did in 2800aadc18a6 ("iwlwifi: Fix softirq/hardirq
> disabling in iwl_pcie_enqueue_hcmd()"), we must apply the same fix to
> iwl_pcie_gen2_enqueue_hcmd(), as it's being called from exactly the same
> contexts.
>
> Reported-by: Heiner Kallweit <hkallweit1@xxxxxxxxx
> Signed-off-by: Jiri Kosina <jkosina@xxxxxxx>
>
> diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/tx-gen2.c b/drivers/net/wireless/intel/iwlwifi/pcie/tx-gen2.c
> index 4456abb9a074..34bde8c87324 100644
> --- a/drivers/net/wireless/intel/iwlwifi/pcie/tx-gen2.c
> +++ b/drivers/net/wireless/intel/iwlwifi/pcie/tx-gen2.c
> @@ -40,6 +40,7 @@ int iwl_pcie_gen2_enqueue_hcmd(struct iwl_trans *trans,
> const u8 *cmddata[IWL_MAX_CMD_TBS_PER_TFD];
> u16 cmdlen[IWL_MAX_CMD_TBS_PER_TFD];
> struct iwl_tfh_tfd *tfd;
> + unsigned long flags;
>
> copy_size = sizeof(struct iwl_cmd_header_wide);
> cmd_size = sizeof(struct iwl_cmd_header_wide);
> @@ -108,14 +109,14 @@ int iwl_pcie_gen2_enqueue_hcmd(struct iwl_trans *trans,
> goto free_dup_buf;
> }
>
> - spin_lock_bh(&txq->lock);
> + spin_lock_irqsave(&txq->lock, flags);
>
> idx = iwl_txq_get_cmd_index(txq, txq->write_ptr);
> tfd = iwl_txq_get_tfd(trans, txq, txq->write_ptr);
> memset(tfd, 0, sizeof(*tfd));
>
> if (iwl_txq_space(trans, txq) < ((cmd->flags & CMD_ASYNC) ? 2 : 1)) {
> - spin_unlock_bh(&txq->lock);
> + spin_unlock_irqrestore(&txq->lock, flags);
>
> IWL_ERR(trans, "No space in command queue\n");
> iwl_op_mode_cmd_queue_full(trans->op_mode);
> @@ -250,7 +251,7 @@ int iwl_pcie_gen2_enqueue_hcmd(struct iwl_trans *trans,
> spin_unlock(&trans_pcie->reg_lock);
>
> out:
> - spin_unlock_bh(&txq->lock);
> + spin_unlock_irqrestore(&txq->lock, flags);
> free_dup_buf:
> if (idx < 0)
> kfree(dup_buf);
Patch applied to wireless-drivers.git, thanks.
e7020bb068d8 iwlwifi: Fix softirq/hardirq disabling in iwl_pcie_gen2_enqueue_hcmd()
--
https://patchwork.kernel.org/project/linux-wireless/patch/nycvar.YFH.7.76.2104171112390.18270@xxxxxxxxxxxxx/
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
