From nobody Mon Feb 9 00:02:36 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C085EC7EE24 for ; Tue, 6 Jun 2023 07:00:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235684AbjFFHAE (ORCPT ); Tue, 6 Jun 2023 03:00:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55354 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235732AbjFFG74 (ORCPT ); Tue, 6 Jun 2023 02:59:56 -0400 Received: from first.geanix.com (first.geanix.com [116.203.34.67]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9AB81E43; Mon, 5 Jun 2023 23:59:52 -0700 (PDT) Received: from xps.geanix.com (unknown [87.54.11.140]) by first.geanix.com (Postfix) with ESMTPSA id D467D4E2838; Tue, 6 Jun 2023 06:59:49 +0000 (UTC) Authentication-Results: ORIGINATING; auth=pass smtp.auth=martin@geanix.com smtp.mailfrom=martin@geanix.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=geanix.com; s=first; t=1686034790; bh=PWNQ09ijoe1DVvYJBNyrmhSiGQflwUabh55Y0/h4L1c=; h=From:To:Cc:Subject:Date; b=f8lJ5bAdZwyI7auhIQ7ItkEZ4qysN5Dl+emu2B7RywGiKcr3FFMQWPvER1ZA6ScK7 2tnmbKnDC4/vRbcWkRmz6ShT3zFghuRUp/vVvrlQieZz53HFdVO/U5IodZsBQHxaeS QMdeEw4GhEDmKcLejFIS3OK7LVxg/Ktc/i/6uqiMK7J4eSK+Eucv8TVLBuKuOyhGLW XhI/n7LDvTcC0xsV/OGLZfJE6gAd3BZ+g0Q6oSJEyo9yDsSaaxmxzQWvv5BVHb3u2A qMKeQEPbvZaUoXKmzN1nWqrbZQqztvBhga7Z+jgyaTuKRbIDVMUJkMOi6sw+V2ctXI 6DUSHPVs5Naeg== From: =?UTF-8?q?Martin=20Hundeb=C3=B8ll?= To: Ulf Hansson , Neil Armstrong , Kevin Hilman , Jerome Brunet , Martin Blumenstingl Cc: =?UTF-8?q?Martin=20Hundeb=C3=B8ll?= , stable@vger.kernel.org, =?UTF-8?q?Martin=20Hundeb=C3=B8ll?= , linux-mmc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH] mmc: meson: move mmc_request_done() call to irq thread Date: Tue, 6 Jun 2023 08:59:17 +0200 Message-Id: <20230606065918.460866-1-martin@geanix.com> X-Mailer: git-send-email 2.40.1 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Martin Hundeb=C3=B8ll The call to mmc_request_done() can schedule, so it cannot be called from irq context. Wake the irq thread if it needs to be called, and call it from there instead. Fixes the following kernel bug, which appears when running an RT patched kernel on the AmLogic Meson AXG A113X SoC: [ 11.111407] BUG: scheduling while atomic: kworker/0:1H/75/0x00010001 [ 11.111438] Modules linked in: [ 11.111451] CPU: 0 PID: 75 Comm: kworker/0:1H Not tainted 6.4.0-rc3-rt2-= rtx-00081-gfd07f41ed6b4-dirty #1 [ 11.111461] Hardware name: RTX AXG A113X Linux Platform Board (DT) [ 11.111469] Workqueue: kblockd blk_mq_run_work_fn [ 11.111492] Call trace: [ 11.111497] dump_backtrace+0xac/0xe8 [ 11.111510] show_stack+0x18/0x28 [ 11.111518] dump_stack_lvl+0x48/0x60 [ 11.111530] dump_stack+0x18/0x24 [ 11.111537] __schedule_bug+0x4c/0x68 [ 11.111548] __schedule+0x80/0x574 [ 11.111558] schedule_loop+0x2c/0x50 [ 11.111567] schedule_rtlock+0x14/0x20 [ 11.111576] rtlock_slowlock_locked+0x468/0x730 [ 11.111587] rt_spin_lock+0x40/0x64 [ 11.111596] __wake_up_common_lock+0x5c/0xc4 [ 11.111610] __wake_up+0x18/0x24 [ 11.111620] mmc_blk_mq_req_done+0x68/0x138 [ 11.111633] mmc_request_done+0x104/0x118 [ 11.111644] meson_mmc_request_done+0x38/0x48 [ 11.111654] meson_mmc_irq+0x128/0x1f0 [ 11.111663] __handle_irq_event_percpu+0x70/0x114 [ 11.111674] handle_irq_event_percpu+0x18/0x4c [ 11.111683] handle_irq_event+0x80/0xb8 [ 11.111691] handle_fasteoi_irq+0xa4/0x120 [ 11.111704] handle_irq_desc+0x20/0x38 [ 11.111712] generic_handle_domain_irq+0x1c/0x28 [ 11.111721] gic_handle_irq+0x8c/0xa8 [ 11.111735] call_on_irq_stack+0x24/0x4c [ 11.111746] do_interrupt_handler+0x88/0x94 [ 11.111757] el1_interrupt+0x34/0x64 [ 11.111769] el1h_64_irq_handler+0x18/0x24 [ 11.111779] el1h_64_irq+0x64/0x68 [ 11.111786] __add_wait_queue+0x0/0x4c [ 11.111795] mmc_blk_rw_wait+0x84/0x118 [ 11.111804] mmc_blk_mq_issue_rq+0x5c4/0x654 [ 11.111814] mmc_mq_queue_rq+0x194/0x214 [ 11.111822] blk_mq_dispatch_rq_list+0x3ac/0x528 [ 11.111834] __blk_mq_sched_dispatch_requests+0x340/0x4d0 [ 11.111847] blk_mq_sched_dispatch_requests+0x38/0x70 [ 11.111858] blk_mq_run_work_fn+0x3c/0x70 [ 11.111865] process_one_work+0x17c/0x1f0 [ 11.111876] worker_thread+0x1d4/0x26c [ 11.111885] kthread+0xe4/0xf4 [ 11.111894] ret_from_fork+0x10/0x20 Fixes: 51c5d8447bd71b ("MMC: meson: initial support for GX platforms") Cc: stable@vger.kernel.org Signed-off-by: Martin Hundeb=C3=B8ll --- drivers/mmc/host/meson-gx-mmc.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mm= c.c index b8514d9d5e736..77b2c23084566 100644 --- a/drivers/mmc/host/meson-gx-mmc.c +++ b/drivers/mmc/host/meson-gx-mmc.c @@ -991,11 +991,8 @@ static irqreturn_t meson_mmc_irq(int irq, void *dev_id) =20 if (data && !cmd->error) data->bytes_xfered =3D data->blksz * data->blocks; - if (meson_mmc_bounce_buf_read(data) || - meson_mmc_get_next_command(cmd)) - ret =3D IRQ_WAKE_THREAD; - else - ret =3D IRQ_HANDLED; + + ret =3D IRQ_WAKE_THREAD; } =20 out: @@ -1007,9 +1004,6 @@ static irqreturn_t meson_mmc_irq(int irq, void *dev_i= d) writel(start, host->regs + SD_EMMC_START); } =20 - if (ret =3D=3D IRQ_HANDLED) - meson_mmc_request_done(host->mmc, cmd->mrq); - return ret; } =20 @@ -1040,6 +1034,13 @@ static irqreturn_t meson_mmc_irq_thread(int irq, voi= d *dev_id) if (WARN_ON(!cmd)) return IRQ_NONE; =20 + if (!meson_mmc_bounce_buf_read(cmd->data) && + !meson_mmc_get_next_command(cmd)) { + meson_mmc_request_done(host->mmc, cmd->mrq); + + return IRQ_HANDLED; + } + if (cmd->error) { meson_mmc_wait_desc_stop(host); meson_mmc_request_done(host->mmc, cmd->mrq); --=20 2.40.1