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| author | Lee Jones <lee.jones@linaro.org> | 2019-09-05 09:25:55 +0100 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2019-09-06 11:08:08 +0200 |
| commit | 8928e917aeafaf38d65cc5cbc1f11e952dbed062 (patch) | |
| tree | 1377f055ac7fc00a5474bf87306ca751b2694c63 | |
| parent | 13212a648f3142a5fa893b1f66baa7eb95f3e3a8 (diff) | |
| download | linux-stable-8928e917aeafaf38d65cc5cbc1f11e952dbed062.tar.gz linux-stable-8928e917aeafaf38d65cc5cbc1f11e952dbed062.tar.bz2 linux-stable-8928e917aeafaf38d65cc5cbc1f11e952dbed062.zip | |
soc: qcom: geni: Provide parameter error checking
When booting with ACPI, the Geni Serial Engine is not set as the I2C/SPI
parent and thus, the wrapper (parent device) is unassigned. This causes
the kernel to crash with a null dereference error.
Link: https://lore.kernel.org/r/20190905082555.15020-1-lee.jones@linaro.org
Fixes: 8bc529b25354 ("soc: qcom: geni: Add support for ACPI")
Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
| -rw-r--r-- | drivers/soc/qcom/qcom-geni-se.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/soc/qcom/qcom-geni-se.c b/drivers/soc/qcom/qcom-geni-se.c index d5cf953b4337..7d622ea1274e 100644 --- a/drivers/soc/qcom/qcom-geni-se.c +++ b/drivers/soc/qcom/qcom-geni-se.c @@ -630,6 +630,9 @@ int geni_se_tx_dma_prep(struct geni_se *se, void *buf, size_t len, struct geni_wrapper *wrapper = se->wrapper; u32 val; + if (!wrapper) + return -EINVAL; + *iova = dma_map_single(wrapper->dev, buf, len, DMA_TO_DEVICE); if (dma_mapping_error(wrapper->dev, *iova)) return -EIO; @@ -663,6 +666,9 @@ int geni_se_rx_dma_prep(struct geni_se *se, void *buf, size_t len, struct geni_wrapper *wrapper = se->wrapper; u32 val; + if (!wrapper) + return -EINVAL; + *iova = dma_map_single(wrapper->dev, buf, len, DMA_FROM_DEVICE); if (dma_mapping_error(wrapper->dev, *iova)) return -EIO; |