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authorGeert Uytterhoeven <geert+renesas@glider.be>2015-04-07 21:39:19 +0300
committerMark Brown <broonie@kernel.org>2015-04-07 21:41:32 +0300
commitff61eb422024a4614f898c1c73625e222b219a5d (patch)
treeccb5274cf076e8b0473c7dfa2408da63b51ec5c4 /include
parentb716c4ffc6a2b0bfbcf9619880f335be11b65708 (diff)
downloadlinux-ff61eb422024a4614f898c1c73625e222b219a5d.tar.xz
spi: Make master->handle_err() callback optional to avoid crashes
If a driver doesn't implement the master->handle_err() callback and an SPI transfer fails, the kernel will crash with a NULL pointer dereference: Unable to handle kernel NULL pointer dereference at virtual address 00000000 pgd = c0003000 [00000000] *pgd=80000040004003, *pmd=00000000 Internal error: Oops: 80000206 [#1] SMP ARM Modules linked in: CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.0.0-rc7-koelsch-05861-g1fc9fdd4add4f783 #1046 Hardware name: Generic R8A7791 (Flattened Device Tree) task: eec359c0 ti: eec54000 task.ti: eec54000 PC is at 0x0 LR is at spi_transfer_one_message+0x1cc/0x1f0 Make the master->handle_err() callback optional to avoid the crash. Also fix a spelling mistake in the callback documentation while we're at it. Fixes: b716c4ffc6a2b0bf ("spi: introduce master->handle_err() callback") Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/spi/spi.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 4eaac3a5227b..5685af84a64d 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -294,7 +294,7 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv)
* transfer_one_message are mutually exclusive; when both
* are set, the generic subsystem does not call your
* transfer_one callback.
- * @handle_err: the subsystem calls the driver to handle and error that occurs
+ * @handle_err: the subsystem calls the driver to handle an error that occurs
* in the generic implementation of transfer_one_message().
* @unprepare_message: undo any work done by prepare_message().
* @cs_gpios: Array of GPIOs to use as chip select lines; one per CS