From 69cac988f2d8506d0b479c5ae7903b9067d7641d Mon Sep 17 00:00:00 2001 From: Grant Grundler Date: Sat, 8 Mar 2008 18:33:16 -0700 Subject: 2.6.25-rc4 de_stop_rxtx polling wrong This untested patch _should_ fix: "(net de2104x) Kernel panic with de2104x tulip driver on boot" http://bugzilla.kernel.org/show_bug.cgi?id=3156 But the bug submitter isn't responding. Same fix has been applied to tulip.c (several years ago) and uli526x.c (Feb 2008) drivers. [ The panic reported in the bug report was removed in a recently (march 2008) accepted patch from Ondrej Zary. ] Signed-off-by: Grant Grundler Signed-off-by: Jeff Garzik --- drivers/net/tulip/de2104x.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) (limited to 'drivers/net') diff --git a/drivers/net/tulip/de2104x.c b/drivers/net/tulip/de2104x.c index 567c62757e9..1b5edd646a8 100644 --- a/drivers/net/tulip/de2104x.c +++ b/drivers/net/tulip/de2104x.c @@ -842,7 +842,7 @@ static inline int de_is_running (struct de_private *de) static void de_stop_rxtx (struct de_private *de) { u32 macmode; - unsigned int work = 1000; + unsigned int i = 1300/100; macmode = dr32(MacMode); if (macmode & RxTx) { @@ -850,10 +850,14 @@ static void de_stop_rxtx (struct de_private *de) dr32(MacMode); } - while (--work > 0) { + /* wait until in-flight frame completes. + * Max time @ 10BT: 1500*8b/10Mbps == 1200us (+ 100us margin) + * Typically expect this loop to end in < 50 us on 100BT. + */ + while (--i) { if (!de_is_running(de)) return; - cpu_relax(); + udelay(100); } printk(KERN_WARNING "%s: timeout expired stopping DMA\n", de->dev->name); -- cgit v1.2.3