spi: spidev: Restore all SPI mode flags on ioctl failure

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In commit f477b7fb13 ("spi: DUAL and QUAD
support"), spi_device.mode was enlarged from 8 to 16 bits.

However, the spidev code still only saved 8 bits of data. If a spidev
SPI_IOC_WR_MODE or SPI_IOC_WR_LSB_FIRST request failed, only the lower 8
bits of the SPI mode were restored, inadvertently clearing the upper 8
bits, possibly disabling Quad or Dual SPI transfers for the device.

Save up to 32 bits to fix this.

For SPI_IOC_WR_MODE this is probably not so important, as it doesn't allow
setting Quad or Dual mode anyway, but SPI_IOC_WR_LSB_FIRST is used to just
set or clear a single bit.

Signed-off-by: Geert Uytterhoeven <geert+renesas@linux-m68k.org>
Signed-off-by: Mark Brown <broonie@linaro.org>

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This commit is contained in:

Geert Uytterhoeven 2014-02-25 11:40:16 +01:00 • committed by Mark Brown

parent 925d16a209

commit e6456186ca

1 changed files with 2 additions and 2 deletions

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drivers/spi/spidev.c

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