linux-kernel - Re: [patch 00/47] Sparse irq rework

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Message-ID: <alpine.LFD.2.00.1010070050410.17015@localhost6.localdomain6>
Date:	Thu, 7 Oct 2010 00:52:43 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Yinghai Lu <yinghai@...nel.org>
cc:	Grant Likely <grant.likely@...retlab.ca>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	LKML <linux-kernel@...r.kernel.org>, linux-arch@...r.kernel.org,
	Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...ux-foundation.org>, x86@...nel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [patch 00/47] Sparse irq rework

On Wed, 6 Oct 2010, Yinghai Lu wrote:

> On 10/05/2010 03:22 AM, Thomas Gleixner wrote:
> > On Sun, 3 Oct 2010, Thomas Gleixner wrote:
> >> On Sun, 3 Oct 2010, Grant Likely wrote:
> >>> Okay, patch 14 looks good to me too (including Yinghai's comment).
> >>> The new allocator seems sane, and I didn't see any obvious errors in
> >>> patches 16-47.  I've not tested any of this yet.  Hopefully I'll be
> >>> able to carve out some time to do so early this week.
> >>
> >> Wait until I pushed out a fixed tree. In meantime I found out how I
> >> managed to screw up the quilt series :(
> >>
> >> Will post, once it's ready.
> > 
> > Pushed out an updated tree to
> > 
> >  git://git.kernel.org/pub/scm/linux/kernel/git/tglx/linux-2.6-sparse-irq.git master
> > 
> 
> test it together with tip, it seems all io apic routing is not set rightly. MSI is ok...
> 
> [  200.290040] ehci_hcd 0000:00:1d.7: PCI INT A -> GSI 23 (level, low) -> IRQ 23
> [  200.290991] ehci_hcd 0000:00:1d.7: setting latency timer to 64
> [  200.310002] ehci_hcd 0000:00:1d.7: EHCI Host Controller
> [  200.310455] ehci_hcd 0000:00:1d.7: new USB bus registered, assigned bus number 1
> [  200.330127] ehci_hcd 0000:00:1d.7: debug port 1
> [  200.334395] ehci_hcd 0000:00:1d.7: cache line size of 256 is not supported
> [  200.350042] ehci_hcd 0000:00:1d.7: request interrupt 23 failed
> [  200.350491] ehci_hcd 0000:00:1d.7: USB bus 1 deregistered
> [  200.372257] ehci_hcd 0000:00:1d.7: PCI INT A disabled
> [  200.372644] ehci_hcd 0000:00:1d.7: init 0000:00:1d.7 fail, -38
> [  200.389916] ehci_hcd: probe of 0000:00:1d.7 failed with error -38

Yep. Ingo's testing found that already. Does the patch below fix it ?

Thanks,

	tglx
---
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 2f171df..eb3d01d 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -252,11 +252,15 @@ static struct irq_cfg *alloc_irq_and_cfg_at(unsigned int at, int node)
 static struct irq_cfg *get_irq_cfg_at(unsigned int at, int node)
 {
 	int res = irq_alloc_desc_at(at, node);
+	struct irq_data *data;
 
 	if (res < 0 && res != -EEXIST)
 		return NULL;
 
-	return get_irq_chip_data(at);
+	data = irq_get_irq_data(at);
+	if (res >= 0 && !data->chip_data)
+		data->chip_data = alloc_irq_cfg(at, node);
+	return data->chip_data;
 }
 
 static int alloc_irq_from(unsigned int from, int node)
--
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