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SubjectRe: ucc_geth broken in 2.6.32 by 864fdf884e82bacbe8ca5e93bd43393a61d2e2b4
On Wed, Dec 23, 2009 at 12:40:19PM -0500, Lennart Sorensen wrote:
> We use the ucc_geth for 6 ports (4 100Mbit and 2 Gbit ports) on an
> mpc8360e. Up to 2.6.31 this worked fine. 2.6.32 on the other hand
> crashes very quickly after boot.

Hm. Just curious, what CPU revision you use? So that I could try
to reproduce the issue... I have MPC8360E-MDS boards, rev 2.0 and
rev rev 2.1 CPUs, Marvell PHYs. I also have MPC8360E-RDK (rev 2.1).
And I didn't see any issues with this patch.

> I managed to see the same crash when I was selectively trying to add newer
> ucc_geth patches to the 2.6.31 kernel a couple of months ago, and the same
> patch that caused a crash then seems suspect. If I revert the patch the
> system runs completely stable. Amusingly, the excact error message the
> patch claims to fix is in fact the error it causes to happen in my case.
>
> So preferably 864fdf884e82bacbe8ca5e93bd43393a61d2e2b4 could be reverted

I don't see any point in reverting, because it will surely break my boards.
So, we need to fix this, not just hide.

> unless someone can fix it.

Well, I'm ready to help you with debugging.

> Now I must add that I run with the xenomai/adeos-ipipe patches as well,
> which do change interrupt handling a little,

It could be that it takes too long to stop the UCC, and xenomai
makes the timings worse, so the watchdog triggers.

Can you try the following patch?

diff --git a/drivers/net/ucc_geth.c b/drivers/net/ucc_geth.c
index afaf088..2f73e3f 100644
--- a/drivers/net/ucc_geth.c
+++ b/drivers/net/ucc_geth.c
@@ -1563,6 +1563,8 @@ static int ugeth_disable(struct ucc_geth_private *ugeth, enum comm_dir mode)

static void ugeth_quiesce(struct ucc_geth_private *ugeth)
{
+ netif_device_detach(ugeth->ndev);
+
/* Wait for and prevent any further xmits. */
netif_tx_disable(ugeth->ndev);

@@ -1577,7 +1579,7 @@ static void ugeth_activate(struct ucc_geth_private *ugeth)
{
napi_enable(&ugeth->napi);
enable_irq(ugeth->ug_info->uf_info.irq);
- netif_tx_wake_all_queues(ugeth->ndev);
+ netif_device_attach(ugeth->ndev);
}

/* Called every time the controller might need to be made

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