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Message-Id: <20240209-cdns-qspi-pm-fix-v3-1-540ac222f26b@bootlin.com>
Date: Fri, 09 Feb 2024 14:55:50 +0100
From: Théo Lebrun <theo.lebrun@...tlin.com>
To: Mark Brown <broonie@...nel.org>, Apurva Nandan <a-nandan@...com>,
Dhruva Gole <d-gole@...com>
Cc: linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
Gregory CLEMENT <gregory.clement@...tlin.com>,
Vladimir Kondratiev <vladimir.kondratiev@...ileye.com>,
Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
Tawfik Bayouk <tawfik.bayouk@...ileye.com>,
Théo Lebrun <theo.lebrun@...tlin.com>
Subject: [PATCH v3 1/4] spi: cadence-qspi: fix pointer reference in runtime
PM hooks
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")
Signed-off-by: Théo Lebrun <theo.lebrun@...tlin.com>
---
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,
--
2.43.0
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