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spi: spi-fsl-dspi: Fix issue with uninitialized dma_slave_config

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[ Upstream commit 209ab223ad5b18e437289235e3bde12593b94ac4 ]

Depending on the DMA driver being used, the struct dma_slave_config may
need to be initialized to zero for the unused data.

For example, we have three DMA drivers using src_port_window_size and
dst_port_window_size. If these are left uninitialized, it can cause DMA
failures.

For spi-fsl-dspi, this is probably not currently an issue but is still
good to fix though.

Fixes: 90ba37033c ("spi: spi-fsl-dspi: Add DMA support for Vybrid")
Cc: Sanchayan Maity <[email protected]>
Cc: Vladimir Oltean <[email protected]>
Cc: Peter Ujfalusi <[email protected]>
Cc: Vinod Koul <[email protected]>
Signed-off-by: Tony Lindgren <[email protected]>
Acked-by: Vladimir Oltean <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
Tony Lindgren 2021-08-10 11:17:26 +03:00 • committed by Greg Kroah-Hartman
commit b29593d069
1 changed files with 1 additions and 0 deletions
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1
drivers/spi/spi-fsl-dspi.c
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@ -423,6 +423,7 @@ static int dspi_request_dma(struct fsl_dspi *dspi, phys_addr_t phy_addr)
goto err_rx_dma_buf;
}
memset(&cfg, 0, sizeof(cfg));
cfg.src_addr = phy_addr + SPI_POPR;
cfg.dst_addr = phy_addr + SPI_PUSHR;
cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;