[PATCH 3.12 083/144] tg3: Expand 4g_overflow_test workaround to skb fragments of any size.

From: Greg Kroah-Hartman
Date: Mon Jan 06 2014 - 18:55:12 EST

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


From: Nithin Sujir <nsujir@xxxxxxxxxxxx>

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@xxxxxxxxxxxx>
Signed-off-by: Michael Chan <mchan@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

drivers/net/ethernet/broadcom/tg3.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -7608,7 +7608,7 @@ static inline int tg3_4g_overflow_test(d
u32 base = (u32) mapping & 0xffffffff;

- return (base > 0xffffdcc0) && (base + len + 8 < base);
+ return base + len + 8 < base;

/* Test for TSO DMA buffers that cross into regions which are within MSS bytes

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