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| author | Zhou Wang <wangzhou1@hisilicon.com> | 2019-07-24 11:54:23 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-08-08 07:45:01 -0600 |
| commit | 79e178f4383a3a645f76bc2dd44c477b361c6a98 (patch) | |
| tree | c414e76b0d0eb6bd2d251f8f1f18198bcf5d5bca | |
| parent | ba6f7da99aaf00042b4ed2d8850ed7534492009e (diff) | |
| download | linux-79e178f4383a3a645f76bc2dd44c477b361c6a98.tar.gz linux-79e178f4383a3a645f76bc2dd44c477b361c6a98.tar.bz2 linux-79e178f4383a3a645f76bc2dd44c477b361c6a98.zip | |
lib: scatterlist: Fix to support no mapped sg
In function sg_split, the second sg_calculate_split will return -EINVAL
when in_mapped_nents is 0.
Indeed there is no need to do second sg_calculate_split and sg_split_mapped
when in_mapped_nents is 0, as in_mapped_nents indicates no mapped entry in
original sgl.
Signed-off-by: Zhou Wang <wangzhou1@hisilicon.com>
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | lib/sg_split.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/lib/sg_split.c b/lib/sg_split.c index 9982c63d1063..60a0babebf2e 100644 --- a/lib/sg_split.c +++ b/lib/sg_split.c @@ -176,11 +176,13 @@ int sg_split(struct scatterlist *in, const int in_mapped_nents, * The order of these 3 calls is important and should be kept. */ sg_split_phys(splitters, nb_splits); - ret = sg_calculate_split(in, in_mapped_nents, nb_splits, skip, - split_sizes, splitters, true); - if (ret < 0) - goto err; - sg_split_mapped(splitters, nb_splits); + if (in_mapped_nents) { + ret = sg_calculate_split(in, in_mapped_nents, nb_splits, skip, + split_sizes, splitters, true); + if (ret < 0) + goto err; + sg_split_mapped(splitters, nb_splits); + } for (i = 0; i < nb_splits; i++) { out[i] = splitters[i].out_sg; |