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authorFrancois Romieu <romieu@fr.zoreil.com>2007-06-16 23:28:45 +0200
committerJeff Garzik <jeff@garzik.org>2007-07-08 22:16:43 -0400
commit4ae47c2ddc55e3c571bb55fca921cfe9b02a685f (patch)
treeab36ce4084f19e952ac2e14d27df857a6366adb5 /drivers/net/r8169.c
parent15d317587e17dcb96484e46b17b6e826a1f97661 (diff)
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r8169: de-obfuscate modulo arithmetic
The former style suggests a modulo arithmetic misuse but the expression should never be < 0. Even if it does, the driver will simply loop longer than expected (not that the remaining parts of the system will necessarily appreciate it...). Let's warn the user when something goes wrong and try to go over it. Signed-off-by: Francois Romieu <romieu@fr.zoreil.com> Cc: Edward Hsu <edward_hsu@realtek.com.tw>
Diffstat (limited to 'drivers/net/r8169.c')
-rw-r--r--drivers/net/r8169.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c
index 4586446..1f7fb54 100644
--- a/drivers/net/r8169.c
+++ b/drivers/net/r8169.c
@@ -2040,10 +2040,12 @@ static u32 rtl8169_rx_fill(struct rtl8169_private *tp, struct net_device *dev,
{
u32 cur;
- for (cur = start; end - cur > 0; cur++) {
+ for (cur = start; end - cur != 0; cur++) {
struct sk_buff *skb;
unsigned int i = cur % NUM_RX_DESC;
+ WARN_ON((s32)(end - cur) < 0);
+
if (tp->Rx_skbuff[i])
continue;