From: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Date: Mon, 18 Feb 2013 08:29:30 +0000 (+0200)
Subject: rtlwifi: usb: allocate URB control message setup_packet and data buffer separately
X-Git-Tag: v3.9-rc1~139^2~2^2^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bc6b89237acb3dee6af6e64e51a18255fef89cc2;p=pandora-kernel.git

rtlwifi: usb: allocate URB control message setup_packet and data buffer separately

rtlwifi allocates both setup_packet and data buffer of control message urb,
using shared kmalloc in _usbctrl_vendorreq_async_write. Structure used for
allocating is:
	struct {
		u8 data[254];
		struct usb_ctrlrequest dr;
	};

Because 'struct usb_ctrlrequest' is __packed, setup packet is unaligned and
DMA mapping of both 'data' and 'dr' confuses ARM/sunxi, leading to memory
corruptions and freezes.

Patch changes setup packet to be allocated separately.

[v2]:
 - Use WARN_ON_ONCE instead of WARN_ON

Cc: <stable@vger.kernel.org>
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
---

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