* Fwd: [PATCH 001/002] de2104x: force correct order when writing to rx ring
[not found] <46e1c7760902071330u10427d33p3f49e82a2e4b1ddc@mail.gmail.com>
@ 2009-02-09 7:27 ` Risto Suominen
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From: Risto Suominen @ 2009-02-09 7:27 UTC (permalink / raw)
To: netdev
[-- Attachment #1: Type: text/plain, Size: 1282 bytes --]
---------- Forwarded message ----------
From: Risto Suominen <risto.suominen@gmail.com>
Date: 2009/2/7
Subject: [PATCH 001/002] de2104x: force correct order when writing to rx ring
To: Jeff Garzik <jgarzik@pobox.com>, lkml <linux-kernel@vger.kernel.org>
DescOwn should not be set, thus allowing the chip to use the descriptor, before
everything else is set up correctly.
Signed-off-by: Risto Suominen <Risto.Suominen@gmail.com>
---
The testing is done on kernel version 2.6.18.
--- drivers/net/tulip/de2104x.c.org 2006-09-20 06:42:06.000000000 +0300
+++ drivers/net/tulip/de2104x.c 2009-02-07 15:04:04.000000000 +0200
@@ -465,13 +465,14 @@ static void de_rx (struct de_private *de
drop = 1;
rx_next:
- de->rx_ring[rx_tail].opts1 = cpu_to_le32(DescOwn);
if (rx_tail == (DE_RX_RING_SIZE - 1))
de->rx_ring[rx_tail].opts2 =
cpu_to_le32(RingEnd | de->rx_buf_sz);
else
de->rx_ring[rx_tail].opts2 = cpu_to_le32(de->rx_buf_sz);
de->rx_ring[rx_tail].addr1 = cpu_to_le32(mapping);
+ wmb();
+ de->rx_ring[rx_tail].opts1 = cpu_to_le32(DescOwn);
rx_tail = NEXT_RX(rx_tail);
}
[-- Attachment #2: de2104x-rx.patch --]
[-- Type: text/x-diff, Size: 850 bytes --]
DescOwn should not be set, thus allowing the chip to use the descriptor, before
everything else is set up correctly.
Signed-off-by: Risto Suominen <Risto.Suominen@gmail.com>
---
The testing is done on kernel version 2.6.18.
--- drivers/net/tulip/de2104x.c.org 2006-09-20 06:42:06.000000000 +0300
+++ drivers/net/tulip/de2104x.c 2009-02-07 15:04:04.000000000 +0200
@@ -465,13 +465,14 @@ static void de_rx (struct de_private *de
drop = 1;
rx_next:
- de->rx_ring[rx_tail].opts1 = cpu_to_le32(DescOwn);
if (rx_tail == (DE_RX_RING_SIZE - 1))
de->rx_ring[rx_tail].opts2 =
cpu_to_le32(RingEnd | de->rx_buf_sz);
else
de->rx_ring[rx_tail].opts2 = cpu_to_le32(de->rx_buf_sz);
de->rx_ring[rx_tail].addr1 = cpu_to_le32(mapping);
+ wmb();
+ de->rx_ring[rx_tail].opts1 = cpu_to_le32(DescOwn);
rx_tail = NEXT_RX(rx_tail);
}
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