From patchwork Mon Apr 22 15:36:07 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sergei Antonov X-Patchwork-Id: 13638643 Received: from mail-lf1-f49.google.com (mail-lf1-f49.google.com [209.85.167.49]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DF6D7224D5; Mon, 22 Apr 2024 15:36:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.49 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713800173; cv=none; b=nhHgYurnJcA8FkxU7czQgO/bNmmDubrXBXSaQoxTrBxhUxjnA6GjDQCW2SwoDJ2AKAaBATg1ejS9qts5jeE/Gu6xqji0x+zfWuHOqxocGLfYW6npTEAIMwkYoPPnsH67InOg9BiJSYbrq6u667liduvFEtk/duye94iai024thI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713800173; c=relaxed/simple; bh=u9HCdteMB+HMYRjR4arnujnff9oEN5NosNpH3UJ9++w=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=B/BgzMMDL9sZ/f+Zbo46JYu4W2MaTo2lw207EWO3GPPc37533HL36TxnrAc67eMhats+SUwiJnmR1WXVHBfKVS8kyJMdXTJdb5rWft0prrpqwKVo8plHOkZXHr8zEnoc6de4XpQskSdf6DsEoCODCUYJhA+9qAxTT6VP9JXXncQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=jb8bYD4R; arc=none smtp.client-ip=209.85.167.49 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="jb8bYD4R" Received: by mail-lf1-f49.google.com with SMTP id 2adb3069b0e04-518a3e0d2ecso6819077e87.3; Mon, 22 Apr 2024 08:36:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1713800170; x=1714404970; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=4Pvm+9Ih6B15UM0NoHUWNBzlKXdp28/1dMYo2uad5Ts=; b=jb8bYD4Rl+pG+Hg2GLGvFcOj2N+1/TbGc6Bh5O/fiVYwq+AaguJLrTlPqhP/VTVxJr 7BbMgz0QPDygSc3BUK3cJPeBmkMK+Fba0q3XZCTAbDQ7Wy1v8o5wLhZrPAj45PM31kxk PbBwvjinufHrW/gUjLwcbSPkJBORZg9QFJNKwuXkrHH1GtnHJ5WE9VlWxhX+/IWt0Fjr ksDjAEGqBNpPJXcMDjDeJ7jDKqyVgBG1Z59xmT0UGcI1jIJzJj9iTs+oPuxqivSX0UIB HkU+rLRCkKjYAMrAqXxkDprCW4CFgc8Thn1IZaN3QyehFMZEBHxpMO3D9RvLbNtQ8wKA +N0w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1713800170; x=1714404970; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=4Pvm+9Ih6B15UM0NoHUWNBzlKXdp28/1dMYo2uad5Ts=; b=laiBG133WfwXkm+DyY0HIwmCujGiilsgvg83UMGd9Cs2JzFgiX0R0RzpxFv/TseQ+7 uV+z0GZgn2BBot9gvadbeYbnCoNdupAj3ub46du9Af94LWK6cfRJvEeth3lEsWAK42Tn XmP/x340U1FbVzrnXpEoBGD2/TBuUjc21FhvzasUQfCu6wVML+8J3Y6+s6PSuDbhpUOU qy04UNCfYFi3KnTbvrCdL9GQ1z0PTj3D8Q8T1PZ1k5n/jrodhCCT10pCnFyRAbC5KO84 H8rCQEJXbzxlWFXpdkW4gWI6DrBEnXyyh+9mR0symC0V8Sm5OKlDYKHLqGBBEjGFr86W vNNg== X-Forwarded-Encrypted: i=1; AJvYcCVirAZX3rXLLUsQHfC1CvYUR4qIo+/dhVqJZGFoKVvIzV9BFNr7RiqKTQEs7vqZD+Z8hRTT50whRyIhGw9o6rQmh9zsU9akM/4ZgJw= X-Gm-Message-State: AOJu0YwMusVQu8qwfdxllth2X5FuSLI3QdjpY1cFy8VWezrM8fhkzrgz 92uXjKhnd3G9zVlFgOqE/h/yopATYD8v5zwf4UKKx/YDsBbTa3eztPWzBQ== X-Google-Smtp-Source: AGHT+IH8oYNV+froVxZZBfVcUz0Gswh4HvKplEEaUMXLrUNqo0BUjkfbera210zCHANfwadlpH/y4Q== X-Received: by 2002:a05:6512:3d24:b0:51a:df97:cc8d with SMTP id d36-20020a0565123d2400b0051adf97cc8dmr9213871lfv.26.1713800169781; Mon, 22 Apr 2024 08:36:09 -0700 (PDT) Received: from saproj-Latitude-5501.yandex.net ([2a02:6b8:0:51e:bc0d:8fdc:ab42:84e7]) by smtp.gmail.com with ESMTPSA id k8-20020a192d08000000b0051ac9a297aasm1269612lfj.141.2024.04.22.08.36.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 22 Apr 2024 08:36:09 -0700 (PDT) From: Sergei Antonov To: linux-mmc@vger.kernel.org, linux-block@vger.kernel.org Cc: linus.walleij@linaro.org, Sergei Antonov Subject: [PATCH] mmc: moxart: fix handling of sgm->consumed, otherwise WARN_ON triggers Date: Mon, 22 Apr 2024 18:36:07 +0300 Message-Id: <20240422153607.963672-1-saproj@gmail.com> X-Mailer: git-send-email 2.40.1 Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 When e.g. 8 bytes are to be read, sgm->consumed equals 8 immediately after sg_miter_next() call. The driver then increments it as bytes are read, so sgm->consumed becomes 16 and this warning triggers in sg_miter_stop(): WARN_ON(miter->consumed > miter->length); WARNING: CPU: 0 PID: 28 at lib/scatterlist.c:925 sg_miter_stop+0x2c/0x10c CPU: 0 PID: 28 Comm: kworker/0:2 Tainted: G W 6.9.0-rc5-dirty #249 Hardware name: Generic DT based system Workqueue: events_freezable mmc_rescan Call trace:. unwind_backtrace from show_stack+0x10/0x14 show_stack from dump_stack_lvl+0x44/0x5c dump_stack_lvl from __warn+0x78/0x16c __warn from warn_slowpath_fmt+0xb0/0x160 warn_slowpath_fmt from sg_miter_stop+0x2c/0x10c sg_miter_stop from moxart_request+0xb0/0x468 moxart_request from mmc_start_request+0x94/0xa8 mmc_start_request from mmc_wait_for_req+0x60/0xa8 mmc_wait_for_req from mmc_app_send_scr+0xf8/0x150 mmc_app_send_scr from mmc_sd_setup_card+0x1c/0x420 mmc_sd_setup_card from mmc_sd_init_card+0x12c/0x4dc mmc_sd_init_card from mmc_attach_sd+0xf0/0x16c mmc_attach_sd from mmc_rescan+0x1e0/0x298 mmc_rescan from process_scheduled_works+0x2e4/0x4ec process_scheduled_works from worker_thread+0x1ec/0x24c worker_thread from kthread+0xd4/0xe0 kthread from ret_from_fork+0x14/0x38 This patch adds initial zeroing of sgm->consumed. It is then incremented as bytes are read or written. Signed-off-by: Sergei Antonov Cc: Linus Walleij Fixes: 3ee0e7c3e67c ("mmc: moxart-mmc: Use sg_miter for PIO") Reviewed-by: Linus Walleij --- drivers/mmc/host/moxart-mmc.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/mmc/host/moxart-mmc.c b/drivers/mmc/host/moxart-mmc.c index b88d6dec209f..9a5f75163aca 100644 --- a/drivers/mmc/host/moxart-mmc.c +++ b/drivers/mmc/host/moxart-mmc.c @@ -300,6 +300,7 @@ static void moxart_transfer_pio(struct moxart_host *host) remain = sgm->length; if (remain > host->data_len) remain = host->data_len; + sgm->consumed = 0; if (data->flags & MMC_DATA_WRITE) { while (remain > 0) {