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spi: Fix scatterlist elements size in spi_map_buf
commit ce99319 upstream. When SPI transfers can be offloaded using DMA, the SPI core need to build a scatterlist to make sure that the buffer to be transferred is dma-able. This patch fixes the scatterlist entry size computation in the case where the maximum acceptable scatterlist entry supported by the DMA controller is less than PAGE_SIZE, when the buffer is vmalloced. For each entry, the actual size is given by the minimum between the desc_len (which is the max buffer size supported by the DMA controller) and the remaining buffer length until we cross a page boundary. Fixes: 65598c1 ("spi: Fix per-page mapping of unaligned vmalloc-ed buffer") Signed-off-by: Maxime Chevallier <[email protected]> Signed-off-by: Mark Brown <[email protected]> Cc: [email protected] Signed-off-by: Greg Kroah-Hartman <[email protected]>
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