lkml.org 
[lkml]   [2013]   [Mar]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
SubjectBug in ks8851.c
From
Date


----- Forwarded by Max Nekludov/USE/Elster on 28.03.2013 22:29 -----
|------------>
| From: |
|------------>
>--------------------------------------------------------------------------------------------------------------------------------------------------|
|Max Nekludov/USE/Elster |
>--------------------------------------------------------------------------------------------------------------------------------------------------|
|------------>
| To: |
|------------>
>--------------------------------------------------------------------------------------------------------------------------------------------------|
|torvalds@osdl.org |
>--------------------------------------------------------------------------------------------------------------------------------------------------|
|------------>
| Cc: |
|------------>
>--------------------------------------------------------------------------------------------------------------------------------------------------|
|linux-kernel@vger.kernel.org, trivial@rustcorp.com.au |
>--------------------------------------------------------------------------------------------------------------------------------------------------|
|------------>
| Date: |
|------------>
>--------------------------------------------------------------------------------------------------------------------------------------------------|
|28.03.2013 22:25 |
>--------------------------------------------------------------------------------------------------------------------------------------------------|
|------------>
| Subject: |
|------------>
>--------------------------------------------------------------------------------------------------------------------------------------------------|
|Bug in ks8851.c |
>--------------------------------------------------------------------------------------------------------------------------------------------------|




According to the Datasheet (page 52):
15-12 Reserved
11-0 RXBC Receive Byte Count
This field indicates the present received frame byte size.

I suppose the code has a bug:
rxh = ks8851_rdreg32(ks, KS_RXFHSR);
rxstat = rxh & 0xffff;
rxlen = rxh >> 16; // BUG!!! 0xFFF mask should be applied

P.S.
without bit mask applied I saw rxlen equal to 15360 which is bigger then
entire RX queue size (12KB).

Thanks,
Max Nekludov

From cb3199cee4490f98d6062e32a75ca377a32b55bc Mon Sep 17 00:00:00 2001
From: Max Neklyudov <macscomp@gmail.com>
Date: Tue, 26 Mar 2013 11:46:57 +0400
Subject: [PATCH] Fix bug in ks8851 driver

---
drivers/net/ks8851.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ks8851.c b/drivers/net/ks8851.c
index 91a93cb..0dc03da 100644
--- a/drivers/net/ks8851.c
+++ b/drivers/net/ks8851.c
@@ -553,7 +553,7 @@ static void ks8851_rx_pkts(struct ks8851_net *ks)
for (; rxfc != 0; rxfc--) {
rxh = ks8851_rdreg32(ks, KS_RXFHSR);
rxstat = rxh & 0xffff;
- rxlen = rxh >> 16;
+ rxlen = (rxh >> 16) & 0xFFF;

netif_dbg(ks, rx_status, ks->netdev,
"rx: stat 0x%04x, len 0x%04x\n", rxstat, rxlen);
--
1.7.10.4


\
 
 \ /
  Last update: 2013-03-28 20:21    [W:0.026 / U:1.024 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site