4.8-stable review patch. If anyone has any objections, please let me know.
------------------ From: Arnd Bergmann <a...@arndb.de> commit 5c0ba57744b1422d528f19430dd66d6803cea86f upstream. 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: 6319a68011b8 ("spi/fsl-espi: avoid infinite loops on fsl_espi_cpu_irq()") Signed-off-by: Arnd Bergmann <a...@arndb.de> Signed-off-by: Mark Brown <broo...@kernel.org> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> --- drivers/spi/spi-fsl-espi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/spi/spi-fsl-espi.c +++ b/drivers/spi/spi-fsl-espi.c @@ -581,7 +581,7 @@ void fsl_espi_cpu_irq(struct mpc8xxx_spi mspi->len -= rx_nr_bytes; - if (mspi->rx) + if (rx_nr_bytes && mspi->rx) mspi->get_rx(rx_data, mspi); }