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| author | Geert Uytterhoeven <geert+renesas@linux-m68k.org> | 2014-02-25 11:40:16 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2014-02-27 13:50:33 +0900 |
| commit | e6456186cae76f80446ba911f77eb2f85d3d927e (patch) | |
| tree | 0dc81d3d47f8c7e7611c3fdb66068cd6ee8d6944 /drivers | |
| parent | 925d16a209b40a3e7202a4f867991fb608834d36 (diff) | |
| download | linux-e6456186cae76f80446ba911f77eb2f85d3d927e.tar.gz linux-e6456186cae76f80446ba911f77eb2f85d3d927e.tar.bz2 linux-e6456186cae76f80446ba911f77eb2f85d3d927e.zip | |
spi: spidev: Restore all SPI mode flags on ioctl failure
In commit f477b7fb13df2b843997559ff34e87d054ba6538 ("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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/spi/spidev.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c index d7c6e36021e8..2abc0f5a82be 100644 --- a/drivers/spi/spidev.c +++ b/drivers/spi/spidev.c @@ -374,7 +374,7 @@ spidev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) case SPI_IOC_WR_MODE: retval = __get_user(tmp, (u8 __user *)arg); if (retval == 0) { - u8 save = spi->mode; + u32 save = spi->mode; if (tmp & ~SPI_MODE_MASK) { retval = -EINVAL; @@ -393,7 +393,7 @@ spidev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) case SPI_IOC_WR_LSB_FIRST: retval = __get_user(tmp, (__u8 __user *)arg); if (retval == 0) { - u8 save = spi->mode; + u32 save = spi->mode; if (tmp) spi->mode |= SPI_LSB_FIRST; |