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author | Nicolas Saenz Julienne <nsaenzjulienne@suse.de> | 2021-02-11 19:08:20 +0100 |
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committer | Mark Brown <broonie@kernel.org> | 2021-02-12 12:41:59 +0000 |
commit | b306320322c9cfaa465bc2c7367acf6072b1ac0e (patch) | |
tree | d4b96f171e062dfe9e3a5ef8d1902b3fe3c316bb /mm/mmu_gather.c | |
parent | 386f771aad15dd535f2368b4adc9958c0160edd4 (diff) | |
download | linux-b306320322c9cfaa465bc2c7367acf6072b1ac0e.tar.gz |
spi: Skip zero-length transfers in spi_transfer_one_message()
With the introduction of 26751de25d25 ("spi: bcm2835: Micro-optimise FIFO loops") it has become apparent that some users might initiate zero-length SPI transfers. A fact the micro-optimization omitted, and which turned out to cause crashes[1]. Instead of changing the micro-optimization itself, use a bigger hammer and skip zero-length transfers altogether for drivers using the default transfer_one_message() implementation. Reported-by: Phil Elwell <phil@raspberrypi.com> Fixes: 26751de25d25 ("spi: bcm2835: Micro-optimise FIFO loops") Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> [1] https://github.com/raspberrypi/linux/issues/4100 Link: https://lore.kernel.org/r/20210211180820.25757-1-nsaenzjulienne@suse.de Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'mm/mmu_gather.c')
0 files changed, 0 insertions, 0 deletions