linux-kernel - [PATCH v1 0/2] scatterlist: introduce sg_nents_for

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Message-ID: <20150601161519.729.75909.stgit@tlendack-t1.amdoffice.net>
Date:	Mon, 1 Jun 2015 11:15:19 -0500
From:	Tom Lendacky <thomas.lendacky@....com>
To:	<linux-crypto@...r.kernel.org>
CC:	David Miller <davem@...emloft.net>, <linux-kernel@...r.kernel.org>,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: [PATCH v1 0/2] scatterlist: introduce sg_nents_for_len

This series introduces and makes use of a new scatterlist function named
sg_nents_for_len. The purpose of this function is determine the number
of scatterlist entries required to satisify a specified length. The
resulting count can be used as input to the dma_map_sg function to map
only the entries needed.

This function is needed for cases where a supplied scatterlist has not
marked the last filled sg entry as the end of the scatterlist. In these
cases, the sg_nents function count includes sg entries that may not have
been filled in. When using this value in a dma_map_sg call it can result
in errors/bugs being generated.

The following patches are included in this series:
- Introduce the sg_nents_for_len function
- Update the ccp driver to use the sg_nents_for_len function

This patch series is based on cryptodev-2.6.

---

Tom Lendacky (2):
      scatterlist: introduce sg_nents_for_len
      crypto: ccp - Protect against poorly marked end of sg list

 drivers/crypto/ccp/ccp-ops.c |    7 +++++--
 include/linux/scatterlist.h  |    1 +
 lib/scatterlist.c            |   32 ++++++++++++++++++++++++++++++++
 3 files changed, 38 insertions(+), 2 deletions(-)

-- 
Tom Lendacky
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