Re: [Bugme-new] [Bug 9721] New: wake on lan fails with sky2 module

On Sun, 13 Jan 2008 16:08:38 +0100 supersud501 [off-list ref] wrote:

supersud501 wrote:

quoted

Rafael J. Wysocki wrote:

quoted

Since it seems to be 100% reproducible, it would be very helpful if 
you could
use git-bisect to identify the offending commit.

allright, bisect found the offending commit, here's what i've done:

first i started bisect with the following command (since i assumed it is 
a net-driver problem):

git-bisect start 'v2.6.24-rc6' 'v2.6.23' '--' 'drivers/net/'

after building many kernels and saying good/bad if wol worked/didn't 
work etc. it identified the following commit:

# bad: [ac93a3946b676025fa55356180e8321639744b31] sky2: enable PCI 
config writes

and refs/bisect/bad gives:

14:16:53 /usr/src/linux-2.6/.git # cat refs/bisect/bad
ac93a3946b676025fa55356180e8321639744b31


need some more info?

i just checked it: commented out the passage of the commit in kernel 
2.6.24-rc7-git4 and compiled it: wol WORKS. so this one line is causing 
my wol-disturbance...

So simply reverting this:

commit ac93a3946b676025fa55356180e8321639744b31
Author: Stephen Hemminger [off-list ref]
Date:   Mon Nov 5 15:52:08 2007 -0800

    sky2: enable PCI config writes
    
    On some boards, PCI configuration space access is turned off by default.
    The 2.6.24 driver doesn't turn it on, and should have.
    
    Signed-off-by: Stephen Hemminger [off-list ref]
    Signed-off-by: Jeff Garzik [off-list ref]

diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index c27c7d6..4f41a94 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c

@@ -2791,6 +2791,9 @@ static void sky2_reset(struct sky2_hw *hw)
 	sky2_write8(hw, B0_CTST, CS_RST_SET);
 	sky2_write8(hw, B0_CTST, CS_RST_CLR);
 
+	/* allow writes to PCI config */
+	sky2_write8(hw, B2_TST_CTRL1, TST_CFG_WRITE_ON);
+
 	/* clear PCI errors, if any */
 	pci_read_config_word(pdev, PCI_STATUS, &status);
 	status |= PCI_STATUS_ERROR_BITS;

fixes this regression?

If so, we should revert that change.

but i noticed another "bug" on 2.6.24-rc7-git with sky2: dmesg shows a 
lot of lines every 5 seconds:

[...]
[  357.400462] sky2 0000:02:00.0: error interrupt status=0xc0000000
[  362.442039] printk: 41 messages suppressed.
[  362.442043] sky2 0000:02:00.0: error interrupt status=0x80000000
[  367.439151] printk: 18 messages suppressed.
[  367.439156] sky2 0000:02:00.0: error interrupt status=0x80000000
[  372.436267] printk: 30 messages suppressed.
[  372.436271] sky2 0000:02:00.0: error interrupt status=0x80000000
[  377.350236] printk: 19 messages suppressed.
[...]

since i do not notice any errors (yet) i'll wait till next rc, maybe it 
will be gone then...

That's not good.  is this new behaviour?