linux-kernel - [PATCH 3.8 121/166] tg3: Expand 4g_overflow_test workaround to skb fragments of any size.

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Message-Id: <1389822780-4729-122-git-send-email-kamal@canonical.com>
Date:	Wed, 15 Jan 2014 13:52:15 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Nithin Nayak Sujir <nsujir@...adcom.com>,
	Michael Chan <mchan@...adcom.com>,
	"David S. Miller" <davem@...emloft.net>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.8 121/166] tg3: Expand 4g_overflow_test workaround to skb fragments of any size.

3.8.13.16 -stable review patch.  If anyone has any objections, please let me know.

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

From: Nithin Sujir <nsujir@...adcom.com>

commit 375679104ab3ccfd18dcbd7ba503734fb9a2c63a upstream.

The current driver assumes that an skb fragment can only be upto jumbo
size. Presumably this was a fast-path optimization. This assumption is
no longer true as fragments can be upto 32k.

v2: Remove unnecessary parantheses per Eric Dumazet.

Signed-off-by: Nithin Nayak Sujir <nsujir@...adcom.com>
Signed-off-by: Michael Chan <mchan@...adcom.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/net/ethernet/broadcom/tg3.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index 79096af..3149f5b 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -7030,7 +7030,7 @@ static inline int tg3_4g_overflow_test(dma_addr_t mapping, int len)
 {
 	u32 base = (u32) mapping & 0xffffffff;
 
-	return (base > 0xffffdcc0) && (base + len + 8 < base);
+	return base + len + 8 < base;
 }
 
 /* Test for DMA addresses > 40-bit */
-- 
1.8.3.2

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