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authorTom Lendacky <thomas.lendacky@amd.com>2015-06-01 11:15:25 -0500
committerHerbert Xu <herbert@gondor.apana.org.au>2015-06-03 10:51:27 +0800
commitcfaed10d1f27d036b72bbdc6b1e59ea28c38ec7f (patch)
tree41afa11a44a4486966af9f1b89025bc9f8e2c8e7 /scripts
parent160544075f2a4028209721723a51f16add7b08b9 (diff)
downloadlinux-cfaed10d1f27d036b72bbdc6b1e59ea28c38ec7f.tar.bz2
scatterlist: introduce sg_nents_for_len
When performing a dma_map_sg() call, the number of sg entries to map is required. Using sg_nents to retrieve the number of sg entries will return the total number of entries in the sg list up to the entry marked as the end. If there happen to be unused entries in the list, these will still be counted. Some dma_map_sg() implementations will not handle the unused entries correctly (lib/swiotlb.c) and execute a BUG_ON. The sg_nents_for_len() function will traverse the sg list and return the number of entries required to satisfy the supplied length argument. This can then be supplied to the dma_map_sg() call to successfully map the sg. Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'scripts')
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