linux-stable.git/crypto/scatterwalk.c, branch linux-4.2.y

crypto: scatterwalk - Hide PageSlab call to optimise away flush_dcache_page

2015-06-03T02:51:25+00:00

On architectures where flush_dcache_page is not needed, we will
end up generating all the code up to the PageSlab call.  This is
because PageSlab operates on a volatile pointer and thus cannot
be optimised away.

This patch works around this by checking whether flush_dcache_page
is needed before we call PageSlab which then allows PageSlab to be
compiled awy.

Signed-off-by: Herbert Xu

crypto: scatterwalk - Add missing sg_init_table to scatterwalk_ffwd

2015-05-28T03:23:17+00:00

We need to call sg_init_table as otherwise the first entry may
inadvertently become the last.

Signed-off-by: Herbert Xu

crypto: scatterwalk - Check for same address in map_and_copy

2015-05-22T03:25:55+00:00

This patch adds a check for in scatterwalk_map_and_copy to avoid
copying from the same address to the same address.  This is going
to be used for IV copying in AEAD IV generators.

There is no provision for partial overlaps.

This patch also uses the new scatterwalk_ffwd instead of doing
it by hand in scatterwalk_map_and_copy.

Signed-off-by: Herbert Xu

crypto: scatterwalk - Add scatterwalk_ffwd helper

2015-05-22T03:25:50+00:00

This patch adds the scatterwalk_ffwd helper which can create an
SG list that starts in the middle of an existing SG list.  The
new list may either be part of the existing list or be a chain
that latches onto part of the existing list.

Signed-off-by: Herbert Xu

crypto: replace scatterwalk_sg_next with sg_next

2015-01-26T00:34:22+00:00

Modify crypto drivers to use the generic SG helper since
both of them are equivalent and the one from crypto is redundant.

See also:
  468577abe37ff7b453a9ac613e0ea155349203ae   reverted in
  b2ab4a57b018aafbba35bff088218f5cc3d2142e

Signed-off-by: Cristian Stoica 
Signed-off-by: Herbert Xu

crypto: scatterwalk - Add support for calculating number of SG elements

2013-08-21T11:27:58+00:00

Crypto layer only passes nbytes to encrypt but in omap-aes driver we need to
know number of SG elements to pass to dmaengine slave API.  We add function for
the same to scatterwalk library.

Signed-off-by: Joel Fernandes 
Signed-off-by: Herbert Xu

crypto: remove the second argument of k[un]map_atomic()

2012-03-20T13:48:16+00:00

Signed-off-by: Cong Wang

crypto: scatterwalk - Fix scatterwalk_done() test

2010-05-19T04:06:29+00:00

We are done with the scattergather entry when the walk offset goes
past sg->offset + sg->length, not when it crosses a page boundary.

There is a similarly queer test in the second half of
scatterwalk_pagedone() that probably needs some scrutiny.

Signed-off-by: David S. Miller 
Signed-off-by: Herbert Xu

crypto: scatterwalk - Avoid flush_dcache_page on slab pages

2009-02-09T03:30:25+00:00

It's illegal to call flush_dcache_page on slab pages on a number
of architectures.  So this patch avoids doing so if PageSlab is
true.

In future we can move the flush_dcache_page call to those page
cache users that actually need it.

Reported-by: David S. Miller 
Signed-off-by: Herbert Xu

[CRYPTO] scatterwalk: Handle zero nbytes in scatterwalk_map_and_copy

2008-01-10T21:16:54+00:00

It's better to return silently than crash and burn when someone feeds us
a zero length.  In particular the null digest algorithm when used as part
of authenc will do that to us.

Signed-off-by: Herbert Xu