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spi: fsl-espi: avoid processing uninitalized data on error 

When we get a spurious interrupt in fsl_espi_irq, we end up
processing four uninitalized bytes of data, as shown in this
warning message:

   drivers/spi/spi-fsl-espi.c: In function 'fsl_espi_irq':
   drivers/spi/spi-fsl-espi.c:462:4: warning: 'rx_data' may be used uninitialized in this function [-Wmaybe-uninitialized]

This adds another check so we skip the data in this case.

Fixes: 6319a68011 ("spi/fsl-espi: avoid infinite loops on fsl_espi_cpu_irq()")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
This commit is contained in:
Arnd Bergmann 2016-10-25 22:57:10 +02:00 committed by Mark Brown
parent 1001354ca3
commit 5c0ba57744
1 changed files with 1 additions and 1 deletions
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2
drivers/spi/spi-fsl-espi.c
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@ -458,7 +458,7 @@ static void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
mspi->len -= rx_nr_bytes;
if (mspi->rx)
if (rx_nr_bytes && mspi->rx)
mspi->get_rx(rx_data, mspi);
}