From: Michal Kazior <michal.kazior@tieto.com>
Date: Wed, 31 Jul 2013 08:55:11 +0000 (+0200)
Subject: ath10k: prevent using invalid ringbuffer indexes
X-Git-Tag: v3.12-rc1~132^2~84^2^2~109^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=432358ed1d18c19dbf89008325ff6ba662d0996e;p=pandora-kernel.git

ath10k: prevent using invalid ringbuffer indexes

If the device is removed and hotplug fails
ioread32() will return 0xFFFFFFFF. In that case
reading ringbuffer during device bringup led to
out-of-bounds addressing of a ringbuffer array
that in turn led to a paging failure.

This could be reproduced by the following:
 * boot without acpi/prevent hotplug from working
 * insert and manually detect (pci rescan) the device
 * remove the device physically
 * load ath10k driver
 * kernel crashed

Ringbuffer index reading is now protected by using
an appropriate mask to prevent addressing an
invalid array index.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
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