linux-kernel - [42/98] p54pci: fix bugs in p54p_check_tx

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Message-Id: <20100510223538.195128270@kvm.kroah.org>
Date:	Mon, 10 May 2010 15:34:54 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Christian Lamparter <chunkeey@...glemail.com>,
	"John W. Linville" <linville@...driver.com>
Subject: [42/98] p54pci: fix bugs in p54p_check_tx_ring

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Hans de Goede <hdegoede@...hat.com>

commit 0250ececdf6813457c98719e2d33b3684881fde0 upstream.

Hans de Goede identified a bug in p54p_check_tx_ring:

there are two ring indices. 1 => tx data and 3 => tx management.
But the old code had a constant "1" and this resulted in spurious
dma unmapping failures.

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=583623
Bug-Identified-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Christian Lamparter <chunkeey@...glemail.com>
Signed-off-by: John W. Linville <linville@...driver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/net/wireless/p54/p54pci.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/wireless/p54/p54pci.c
+++ b/drivers/net/wireless/p54/p54pci.c
@@ -237,7 +237,7 @@ static void p54p_check_tx_ring(struct ie
 	u32 idx, i;

 	i = (*index) % ring_limit;
-	(*index) = idx = le32_to_cpu(ring_control->device_idx[1]);
+	(*index) = idx = le32_to_cpu(ring_control->device_idx[ring_index]);
 	idx %= ring_limit;

 	while (i != idx) {

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