mtd: spi-nor: fsl-quadspi: Don't let -EINVAL on the bus
commit 00041227 upstream. fsl_qspi_get_seqid() may return -EINVAL, but fsl_qspi_init_ahb_read() doesn't check for error codes with the result that -EINVAL could find itself signalled over the bus. In conjunction with the LS1046A SoC's A-009283 errata ("Illegal accesses to SPI flash memory can result in a system hang") this illegal access to SPI flash memory results in a system hang if userspace attempts reading later on. Avoid this by always checking fsl_qspi_get_seqid()'s return value and bail out otherwise. Fixes: e46ecda7 ("mtd: spi-nor: Add Freescale QuadSPI driver") Cc: stable@vger.kernel.org Signed-off-by: NAhmad Fatoum <a.fatoum@pengutronix.de> Signed-off-by: NBoris Brezillon <boris.brezillon@bootlin.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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