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author | Daniel Vetter <daniel.vetter@ffwll.ch> | 2015-07-15 16:36:50 +0200 |
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committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2015-07-15 16:36:50 +0200 |
commit | aae2c59be8b1c95876946285d83c8163412367d4 (patch) | |
tree | 8fb05d773ddcfd7739de5c7291bc5fad9a42b2bd /crypto/scatterwalk.c | |
parent | 8becc9953f7f8b7980106ced51ec8ed67ccc09f9 (diff) | |
parent | 2d361b75fadcca0a45fc1dccc96c3c74ce80dd6c (diff) | |
download | linux-crypto-aae2c59be8b1c95876946285d83c8163412367d4.tar.gz linux-crypto-aae2c59be8b1c95876946285d83c8163412367d4.zip |
Merge tag 'drm-intel-fixes-2015-07-15' into drm-intel-next-queued
Backmerge fixes since it's getting out of hand again with the massive
split due to atomic between -next and 4.2-rc. All the bugfixes in
4.2-rc are addressed already (by converting more towards atomic
instead of minimal duct-tape) so just always pick the version in next
for the conflicts in modeset code.
All the other conflicts are just adjacent lines changed.
Conflicts:
drivers/gpu/drm/i915/i915_drv.h
drivers/gpu/drm/i915/i915_gem_gtt.c
drivers/gpu/drm/i915/intel_display.c
drivers/gpu/drm/i915/intel_drv.h
drivers/gpu/drm/i915/intel_ringbuffer.h
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Diffstat (limited to '')
-rw-r--r-- | crypto/scatterwalk.c | 45 |
1 files changed, 34 insertions, 11 deletions
diff --git a/crypto/scatterwalk.c b/crypto/scatterwalk.c index 3bd749c7..ea5815c5 100644 --- a/crypto/scatterwalk.c +++ b/crypto/scatterwalk.c @@ -54,7 +54,11 @@ static void scatterwalk_pagedone(struct scatter_walk *walk, int out, struct page *page; page = sg_page(walk->sg) + ((walk->offset - 1) >> PAGE_SHIFT); - if (!PageSlab(page)) + /* Test ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE first as + * PageSlab cannot be optimised away per se due to + * use of volatile pointer. + */ + if (ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE && !PageSlab(page)) flush_dcache_page(page); } @@ -104,22 +108,18 @@ void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg, unsigned int start, unsigned int nbytes, int out) { struct scatter_walk walk; - unsigned int offset = 0; + struct scatterlist tmp[2]; if (!nbytes) return; - for (;;) { - scatterwalk_start(&walk, sg); - - if (start < offset + sg->length) - break; + sg = scatterwalk_ffwd(tmp, sg, start); - offset += sg->length; - sg = sg_next(sg); - } + if (sg_page(sg) == virt_to_page(buf) && + sg->offset == offset_in_page(buf)) + return; - scatterwalk_advance(&walk, start - offset); + scatterwalk_start(&walk, sg); scatterwalk_copychunks(buf, &walk, nbytes, out); scatterwalk_done(&walk, out, 0); } @@ -146,3 +146,26 @@ int scatterwalk_bytes_sglen(struct scatterlist *sg, int num_bytes) return n; } EXPORT_SYMBOL_GPL(scatterwalk_bytes_sglen); + +struct scatterlist *scatterwalk_ffwd(struct scatterlist dst[2], + struct scatterlist *src, + unsigned int len) +{ + for (;;) { + if (!len) + return src; + + if (src->length > len) + break; + + len -= src->length; + src = sg_next(src); + } + + sg_init_table(dst, 2); + sg_set_page(dst, sg_page(src), src->length - len, src->offset + len); + scatterwalk_crypto_chain(dst, sg_next(src), 0, 2); + + return dst; +} +EXPORT_SYMBOL_GPL(scatterwalk_ffwd); |