Re: [SPARC64] INO problem Re: [Bug 10273] New: Sun GEM (PCI) - network device doesn't work

[David Miller <davem@davemloft.net>]

From: Jarek Poplawski <jarkao2@gmail.com>
Date: Wed, 2 Apr 2008 20:26:55 +0200

> Nice work Jos! I forward it to the author and the lists.

I haven't forgotten about this bug report, in fact I did some
investigation and thinking about it.

I think the case being triggered in the new code is IRQ_DISABLED.

If this is the problem, I suspect that what needs to happen is that
when we re-enable the interrupt we have to forcefully hit the clear
register to put it back into transmit state.  Otherwise it can
get stuck.

Please give this patch a try (this is against 2.6.23, which is the
version you reported the bug against, let me know if another version
is more convenient).

Thanks!

diff --git a/arch/sparc64/kernel/irq.c b/arch/sparc64/kernel/irq.c
index 2395609..98b68d2 100644
--- a/arch/sparc64/kernel/irq.c
+++ b/arch/sparc64/kernel/irq.c
@@ -313,6 +313,8 @@ static void sun4u_irq_enable(unsigned int virt_irq)
 			 IMAP_AID_SAFARI | IMAP_NID_SAFARI);
 		val |= tid | IMAP_VALID;
 		upa_writeq(val, imap);
+
+		upa_writeq(ICLR_IDLE, data->iclr);
 	}
 }