From: Alan Stern <stern@rowland.harvard.edu>
Date: Tue, 16 May 2017 15:47:29 +0000 (-0400)
Subject: USB: ene_usb6250: fix DMA to the stack
X-Git-Tag: v3.2.93~96
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ab8f1df1e68713eb52ad216117b41de3207fa844;p=pandora-kernel.git

USB: ene_usb6250: fix DMA to the stack

commit 628c2893d44876ddd11602400c70606ade62e129 upstream.

The ene_usb6250 sub-driver in usb-storage does USB I/O to buffers on
the stack, which doesn't work with vmapped stacks.  This patch fixes
the problem by allocating a separate 512-byte buffer at probe time and
using it for all of the offending I/O operations.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Reported-and-tested-by: Andreas Hartmann <andihartmann@01019freenet.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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