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(p200300ea8f1fbb00fd2ca424dc3dffa1.dip0.t-ipconnect.de. [2003:ea:8f1f:bb00:fd2c:a424:dc3d:ffa1]) by smtp.googlemail.com with ESMTPSA id t23sm7536601wra.50.2021.03.19.03.43.09 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 19 Mar 2021 03:43:12 -0700 (PDT) To: Luca Coelho , Kalle Valo , Johannes Berg Cc: Jakub Kicinski , linux-wireless@vger.kernel.org, David Miller , "netdev@vger.kernel.org" From: Heiner Kallweit Subject: Problem in iwl_pcie_gen2_enqueue_hcmd if irqs are disabled Message-ID: <0af0ac51-1e13-8406-221e-db2c31b3695e@gmail.com> Date: Fri, 19 Mar 2021 11:43:04 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org I get the following error on linux-next when bringing the device up. It's such an obvious error that I wonder how it could pass your QA. led_trigger_event() disables interrupts, and spin_unlock_bh() complains about this. The following fixes the warning for me. I'd say this means also commit "iwlwifi: pcie: don't disable interrupts for reg_lock" is wrong. diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/tx-gen2.c b/drivers/net/wireless/intel/iwlwifi/pcie/tx-gen2.c index 4456abb9a..34bde8c87 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);