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authorMatthias Kaehlcke <mka@chromium.org>2020-01-08 13:40:32 -0800
committerMark Brown <broonie@kernel.org>2020-01-13 15:04:40 +0000
commitb8d40d7712f10475effc4552eda96b9d44822cfb (patch)
tree742bdcb7a5c47991d97108086cb88215465fa71a /drivers/spi
parent99eb0a1221ac1083b8c87932c438ef016abdaa05 (diff)
downloadlinux-b8d40d7712f10475effc4552eda96b9d44822cfb.tar.bz2
spi: spi-qcom-qspi: Use device managed memory for clk_bulk_data
Currrently the memory for the clk_bulk_data of the QSPI controller is allocated with spi_alloc_master(). The bulk data pointer is passed to devm_clk_bulk_get() which saves it in clk_bulk_devres->clks. When the device is removed later devm_clk_bulk_release() is called and uses the bulk data referenced by the pointer to release the clocks. For this driver this results in accessing memory that has already been freed, since the memory allocated with spi_alloc_master() is released by spi_controller_release(), which is called before the managed resources are released. Use device managed memory for the clock bulk data to fix the issue described above. Signed-off-by: Matthias Kaehlcke <mka@chromium.org> Reviewed-by: Douglas Anderson <dianders@chromium.org> Link: https://lore.kernel.org/r/20200108133948.1.I35ceb4db3ad8cfab78f7cd51494aeff4891339f5@changeid Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-qcom-qspi.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/spi/spi-qcom-qspi.c b/drivers/spi/spi-qcom-qspi.c
index 250fd60e1678..3c4f83bf7084 100644
--- a/drivers/spi/spi-qcom-qspi.c
+++ b/drivers/spi/spi-qcom-qspi.c
@@ -137,7 +137,7 @@ enum qspi_clocks {
struct qcom_qspi {
void __iomem *base;
struct device *dev;
- struct clk_bulk_data clks[QSPI_NUM_CLKS];
+ struct clk_bulk_data *clks;
struct qspi_xfer xfer;
/* Lock to protect xfer and IRQ accessed registers */
spinlock_t lock;
@@ -445,6 +445,13 @@ static int qcom_qspi_probe(struct platform_device *pdev)
goto exit_probe_master_put;
}
+ ctrl->clks = devm_kcalloc(dev, QSPI_NUM_CLKS,
+ sizeof(*ctrl->clks), GFP_KERNEL);
+ if (!ctrl->clks) {
+ ret = -ENOMEM;
+ goto exit_probe_master_put;
+ }
+
ctrl->clks[QSPI_CLK_CORE].id = "core";
ctrl->clks[QSPI_CLK_IFACE].id = "iface";
ret = devm_clk_bulk_get(dev, QSPI_NUM_CLKS, ctrl->clks);