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 D4A1045BF1 for ; Wed, 15 Nov 2023 22:02:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="r5PDXbsV" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 83E52C433C7; Wed, 15 Nov 2023 22:02:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1700085776; bh=PCewESNMSe6KZqLZ5t4XXt7BYlFw6GvTkz74ce1IcT4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=r5PDXbsVQTGVt9ya3XGCtd8txxFDSwfc4TNHfH1aP9zLjVV4dqCSmznvX618Vh5Ho vGQxlTIr/OQdwn+skiQFs7QilYSjFU1f3k9gFDiMQrv/GN/8z49ZLCLqhSzOdrI7As bh6Nthbu4Ssmj0JNW9FR3kS624f8yW5TQMFuwUy4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , Bjorn Andersson , Sasha Levin Subject: [PATCH 5.4 047/119] soc: qcom: llcc: Handle a second device without data corruption Date: Wed, 15 Nov 2023 17:00:37 -0500 Message-ID: <20231115220134.094018747@linuxfoundation.org> X-Mailer: git-send-email 2.42.1 In-Reply-To: <20231115220132.607437515@linuxfoundation.org> References: <20231115220132.607437515@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore 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 5.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Uwe Kleine-König [ Upstream commit f1a1bc8775b26345aba2be278118999e7f661d3d ] Usually there is only one llcc device. But if there were a second, even a failed probe call would modify the global drv_data pointer. So check if drv_data is valid before overwriting it. Signed-off-by: Uwe Kleine-König Fixes: a3134fb09e0b ("drivers: soc: Add LLCC driver") Link: https://lore.kernel.org/r/20230926083229.2073890-1-u.kleine-koenig@pengutronix.de Signed-off-by: Bjorn Andersson Signed-off-by: Sasha Levin --- drivers/soc/qcom/llcc-qcom.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/soc/qcom/llcc-qcom.c b/drivers/soc/qcom/llcc-qcom.c index 19039f19af971..431b214975c85 100644 --- a/drivers/soc/qcom/llcc-qcom.c +++ b/drivers/soc/qcom/llcc-qcom.c @@ -356,6 +356,9 @@ static int qcom_llcc_probe(struct platform_device *pdev, int ret, i; struct platform_device *llcc_edac; + if (!IS_ERR(drv_data)) + return -EBUSY; + drv_data = devm_kzalloc(dev, sizeof(*drv_data), GFP_KERNEL); if (!drv_data) { ret = -ENOMEM; -- 2.42.0