mirror of https://gitee.com/openkylin/linux.git
bfa4133795
spi_nor_read_sfdp() calls nor->read() to read the SFDP data.
When the m25p80 driver is used (pretty common case), nor->read() is then
implemented by the m25p80_read() function, which is likely to initialize a
'struct spi_transfer' from its buf argument before appending this
structure inside the 'struct spi_message' argument of spi_sync().
Besides the SPI sub-system states that both .tx_buf and .rx_buf members of
'struct spi_transfer' must point into dma-safe memory. However, two of the
three calls of spi_nor_read_sfdp() were given pointers to stack allocated
memory as buf argument, hence not in a dma-safe area.
Hopefully, the third and last call of spi_nor_read_sfdp() was already
given a kmalloc'ed buffer argument, hence dma-safe.
So this patch fixes this issue by introducing a
spi_nor_read_sfdp_dma_unsafe() function which simply wraps the existing
spi_nor_read_sfdp() function and uses some kmalloc'ed memory as a bounce
buffer.
Fixes:
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|---|---|---|
| .. | ||
| Kconfig | ||
| Makefile | ||
| aspeed-smc.c | ||
| atmel-quadspi.c | ||
| cadence-quadspi.c | ||
| fsl-quadspi.c | ||
| hisi-sfc.c | ||
| intel-spi-pci.c | ||
| intel-spi-platform.c | ||
| intel-spi.c | ||
| intel-spi.h | ||
| mtk-quadspi.c | ||
| nxp-spifi.c | ||
| spi-nor.c | ||
| stm32-quadspi.c | ||