From: Paul Zimmerman <Paul.Zimmerman@synopsys.com>
Date: Sat, 12 Feb 2011 22:07:20 +0000 (-0800)
Subject: xhci: Fix errors in the running total calculations in the TRB math
X-Git-Tag: v2.6.38-rc7~33^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5807795bd4dececdf553719cc02869e633395787;p=pandora-kernel.git

xhci: Fix errors in the running total calculations in the TRB math

Calculations like

	running_total = TRB_MAX_BUFF_SIZE -
		(sg_dma_address(sg) & (TRB_MAX_BUFF_SIZE - 1));
	if (running_total != 0)
		num_trbs++;

are incorrect, because running_total can never be zero, so the if()
expression will never be true. I think the intention was that
running_total be in the range of 0 to TRB_MAX_BUFF_SIZE-1, not 1
to TRB_MAX_BUFF_SIZE. So adding a

	running_total &= TRB_MAX_BUFF_SIZE - 1;

fixes the problem.

This patch should be queued for stable kernels back to 2.6.31.

Signed-off-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: stable@kernel.org
---

Reading git-diff-tree failed