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Date:   Mon, 03 May 2021 11:22:01 +0000
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
From:   Jari Ruusu <jariruusu@protonmail.com>
Cc:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "stable@vger.kernel.org" <stable@vger.kernel.org>,
        Jiri Kosina <jkosina@suse.cz>,
        Kalle Valo <kvalo@codeaurora.org>
Reply-To: Jari Ruusu <jariruusu@protonmail.com>
Subject: Re: [PATCH 5.10 1/2] iwlwifi: Fix softirq/hardirq disabling in iwl_pcie_gen2_enqueue_hcmd()
Message-ID: <l1Axpsjmxpj3fqrMq1HbCjH-acZIdr5UE3cL5BVihuEQkDz0WjqckZo0n-tbI5_LcrtdLsL9tpPwPISRmo_q02bo7pW-3vHD98CQbDdv-tg=@protonmail.com>
In-Reply-To: <YI6HFNNvzuHnv5VU@kroah.com>
References: <20210430141910.473289618@linuxfoundation.org> <20210430141910.521897363@linuxfoundation.org> <608CFF6A.4BC054A3@users.sourceforge.net> <YI6HFNNvzuHnv5VU@kroah.com>
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On Sunday, May 2, 2021 2:03 PM, Greg Kroah-Hartman <gregkh@linuxfoundation.=
org> wrote:
> If you could provide backported patches to those kernels you think this
> is needed to, I can take them directly. Otherwise running sed isn't
> always the easiest thing to do on my end :)

iwlwifi: Fix softirq/hardirq disabling in iwl_pcie_gen2_enqueue_hcmd()
upstream commit e7020bb068d8be50a92f48e36b236a1a1ef9282e,
backport for linux-5.4.y and linux-4.19.y (booted and ping tested)
Signed-off-by: Jari Ruusu <jariruusu@protonmail.com>

--- a/drivers/net/wireless/intel/iwlwifi/pcie/tx-gen2.c
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/tx-gen2.c
@@ -705,6 +705,7 @@ static int iwl_pcie_gen2_enqueue_hcmd(struct iwl_trans =
*trans,
 =09const u8 *cmddata[IWL_MAX_CMD_TBS_PER_TFD];
 =09u16 cmdlen[IWL_MAX_CMD_TBS_PER_TFD];
 =09struct iwl_tfh_tfd *tfd;
+=09unsigned long flags2;

 =09copy_size =3D sizeof(struct iwl_cmd_header_wide);
 =09cmd_size =3D sizeof(struct iwl_cmd_header_wide);
@@ -773,14 +774,14 @@ static int iwl_pcie_gen2_enqueue_hcmd(struct iwl_tran=
s *trans,
 =09=09goto free_dup_buf;
 =09}

-=09spin_lock_bh(&txq->lock);
+=09spin_lock_irqsave(&txq->lock, flags2);

 =09idx =3D iwl_pcie_get_cmd_index(txq, txq->write_ptr);
 =09tfd =3D iwl_pcie_get_tfd(trans, txq, txq->write_ptr);
 =09memset(tfd, 0, sizeof(*tfd));

 =09if (iwl_queue_space(trans, txq) < ((cmd->flags & CMD_ASYNC) ? 2 : 1)) {
-=09=09spin_unlock_bh(&txq->lock);
+=09=09spin_unlock_irqrestore(&txq->lock, flags2);

 =09=09IWL_ERR(trans, "No space in command queue\n");
 =09=09iwl_op_mode_cmd_queue_full(trans->op_mode);
@@ -915,7 +916,7 @@ static int iwl_pcie_gen2_enqueue_hcmd(struct iwl_trans =
*trans,
 =09spin_unlock_irqrestore(&trans_pcie->reg_lock, flags);

 out:
-=09spin_unlock_bh(&txq->lock);
+=09spin_unlock_irqrestore(&txq->lock, flags2);
 free_dup_buf:
 =09if (idx < 0)
 =09=09kfree(dup_buf);

--
Jari Ruusu=C2=A0 4096R/8132F189 12D6 4C3A DCDA 0AA4 27BD=C2=A0 ACDF F073 3C=
80 8132 F189