From patchwork Thu Feb 22 10:12:29 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Th=C3=A9o_Lebrun?= X-Patchwork-Id: 13567018 Received: from relay7-d.mail.gandi.net (relay7-d.mail.gandi.net [217.70.183.200]) (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 ADA8A39864; Thu, 22 Feb 2024 10:12:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.200 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708596759; cv=none; b=tATfKLumMEmykV4X8GNmo82jpVup/qIjG2osBe18wncspJoLWVycbxDT9ENVW4kkT4U70qq1BOFCpQ6+j9uN5CRXJQYaFy2rAqDHDbVcb4GOV7yOBfwMc3AVrx4vqway/9J0vcv0JJo7TQV2/aa5YpxytT39a0BxP4v8DDMumv8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708596759; c=relaxed/simple; bh=pM5LYZyHZMUxJj8CsXE8e5NI/BUXEphnfuI4iyKBZ3I=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=MEWqwmOO+CcbX9N4TRwdS4GBD2VVRm/in+yc63gtHBjzxyq7bH+p+Grg4uVZP/kP0gbzwYym3yezMsQ1k55rmQSm0+HFWuP6+Cji/6CtCwjc6MHNTb+I8irOvt1f/rzzH8RE9tVcdaILQGhZXiVjN61pdMQR0ChbkzmOE8X7NkM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=C12geg+A; arc=none smtp.client-ip=217.70.183.200 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="C12geg+A" Received: by mail.gandi.net (Postfix) with ESMTPSA id CC85B20004; Thu, 22 Feb 2024 10:12:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1708596751; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=PYyfGG5F+SG8R9R5MyMBf2L1QHcp8qaW343NfMmdTxo=; b=C12geg+ATDXZAWApHIm+FM8jNWV2pVTmU59v+gb3sVRSDhDlvErRLgwTh0Uv8UIkhVzs+4 YnDYb5yCVWElbCaz7tP4LNhgwfa6O9ppsCMqWnUeC0qzFiLGe5GeclDxvWjnUtXKHFe9Gl dmG5QRnAoXHR1Z1vShl8oobqr5esxgh4PL2vEdTigvUqGbM58T7eZL0SptBIYTPZ87qQMJ 5fukdbCBjFHL3amwiG2kEZ/AZ2zb29hi8EEfwJMKvvqfcQy7sV81sGECuUB9LJRKR9IbuK Rj5Bsvn2QVdXVG6mcnO2EMKOAgdxhs15vkdxAQ1z/DtH0wGrGkkIZbXkfDESLg== From: =?utf-8?q?Th=C3=A9o_Lebrun?= Date: Thu, 22 Feb 2024 11:12:29 +0100 Subject: [PATCH v4 1/4] spi: cadence-qspi: fix pointer reference in runtime PM hooks Precedence: bulk X-Mailing-List: linux-spi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240222-cdns-qspi-pm-fix-v4-1-6b6af8bcbf59@bootlin.com> References: <20240222-cdns-qspi-pm-fix-v4-0-6b6af8bcbf59@bootlin.com> In-Reply-To: <20240222-cdns-qspi-pm-fix-v4-0-6b6af8bcbf59@bootlin.com> To: Mark Brown , Apurva Nandan , Dhruva Gole Cc: linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org, Gregory CLEMENT , Vladimir Kondratiev , Thomas Petazzoni , Tawfik Bayouk , =?utf-8?q?Th=C3=A9o_Lebrun?= X-Mailer: b4 0.13.0 X-GND-Sasl: theo.lebrun@bootlin.com dev_get_drvdata() gets used to acquire the pointer to cqspi and the SPI controller. Neither embed the other; this lead to memory corruption. On a given platform (Mobileye EyeQ5) the memory corruption is hidden inside cqspi->f_pdata. Also, this uninitialised memory is used as a mutex (ctlr->bus_lock_mutex) by spi_controller_suspend(). Fixes: 2087e85bb66e ("spi: cadence-quadspi: fix suspend-resume implementations") Reviewed-by: Dhruva Gole Signed-off-by: Théo Lebrun --- drivers/spi/spi-cadence-quadspi.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/drivers/spi/spi-cadence-quadspi.c b/drivers/spi/spi-cadence-quadspi.c index 74647dfcb86c..d19ba024c80b 100644 --- a/drivers/spi/spi-cadence-quadspi.c +++ b/drivers/spi/spi-cadence-quadspi.c @@ -1930,10 +1930,9 @@ static void cqspi_remove(struct platform_device *pdev) static int cqspi_suspend(struct device *dev) { struct cqspi_st *cqspi = dev_get_drvdata(dev); - struct spi_controller *host = dev_get_drvdata(dev); int ret; - ret = spi_controller_suspend(host); + ret = spi_controller_suspend(cqspi->host); cqspi_controller_enable(cqspi, 0); clk_disable_unprepare(cqspi->clk); @@ -1944,7 +1943,6 @@ static int cqspi_suspend(struct device *dev) static int cqspi_resume(struct device *dev) { struct cqspi_st *cqspi = dev_get_drvdata(dev); - struct spi_controller *host = dev_get_drvdata(dev); clk_prepare_enable(cqspi->clk); cqspi_wait_idle(cqspi); @@ -1953,7 +1951,7 @@ static int cqspi_resume(struct device *dev) cqspi->current_cs = -1; cqspi->sclk = 0; - return spi_controller_resume(host); + return spi_controller_resume(cqspi->host); } static DEFINE_RUNTIME_DEV_PM_OPS(cqspi_dev_pm_ops, cqspi_suspend,