From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8C4806FA0 for ; Mon, 16 Jan 2023 17:15:02 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0E14FC433EF; Mon, 16 Jan 2023 17:15:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1673889302; bh=kM3EOa+KFnmuspH3WLt6fAJIWYBkxWzger0YLgg0NOw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ygVUJHNpY4EzLQO7o14UxFbbvJPYcRUBEFDd083WUcAB5u18fnfzH1qj6jJpn4HJ1 r+bvhLz2GExn20jEvMhz2Km2wMeSPgA9Q67TCvf67dGEUHN4KTWrn2ez5TzRNTJ//H KbU27agRTJHZ0PsoZIA1LZG606YgVyNKX5MsQ2fo= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ricardo Ribalda , Adam Ward , Mark Brown , Sasha Levin Subject: [PATCH 4.14 335/338] regulator: da9211: Use irq handler when ready Date: Mon, 16 Jan 2023 16:53:28 +0100 Message-Id: <20230116154835.701176415@linuxfoundation.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230116154820.689115727@linuxfoundation.org> References: <20230116154820.689115727@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Ricardo Ribalda [ Upstream commit 02228f6aa6a64d588bc31e3267d05ff184d772eb ] If the system does not come from reset (like when it is kexec()), the regulator might have an IRQ waiting for us. If we enable the IRQ handler before its structures are ready, we crash. This patch fixes: [ 1.141839] Unable to handle kernel read from unreadable memory at virtual address 0000000000000078 [ 1.316096] Call trace: [ 1.316101] blocking_notifier_call_chain+0x20/0xa8 [ 1.322757] cpu cpu0: dummy supplies not allowed for exclusive requests [ 1.327823] regulator_notifier_call_chain+0x1c/0x2c [ 1.327825] da9211_irq_handler+0x68/0xf8 [ 1.327829] irq_thread+0x11c/0x234 [ 1.327833] kthread+0x13c/0x154 Signed-off-by: Ricardo Ribalda Reviewed-by: Adam Ward Link: https://lore.kernel.org/r/20221124-da9211-v2-0-1779e3c5d491@chromium.org Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- drivers/regulator/da9211-regulator.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/drivers/regulator/da9211-regulator.c b/drivers/regulator/da9211-regulator.c index aa47280efd32..8879e315211e 100644 --- a/drivers/regulator/da9211-regulator.c +++ b/drivers/regulator/da9211-regulator.c @@ -470,6 +470,12 @@ static int da9211_i2c_probe(struct i2c_client *i2c, chip->chip_irq = i2c->irq; + ret = da9211_regulator_init(chip); + if (ret < 0) { + dev_err(chip->dev, "Failed to initialize regulator: %d\n", ret); + return ret; + } + if (chip->chip_irq != 0) { ret = devm_request_threaded_irq(chip->dev, chip->chip_irq, NULL, da9211_irq_handler, @@ -484,11 +490,6 @@ static int da9211_i2c_probe(struct i2c_client *i2c, dev_warn(chip->dev, "No IRQ configured\n"); } - ret = da9211_regulator_init(chip); - - if (ret < 0) - dev_err(chip->dev, "Failed to initialize regulator: %d\n", ret); - return ret; } -- 2.35.1