linux-kernel - Re: 2.6.24-rc8-mm1

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Message-ID: <20080118014223.GB25389@linux-os.sc.intel.com>
Date:	Thu, 17 Jan 2008 17:42:23 -0800
From:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
To:	Balbir Singh <balbir@...ux.vnet.ibm.com>
Cc:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Linux ACPI mailing list <linux-acpi@...r.kernel.org>,
	Intel E/100 mailing list <e1000-devel@...ts.sourceforge.net>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>, andreas.herrmann3@....com
Subject: Re: 2.6.24-rc8-mm1

On Thu, Jan 17, 2008 at 03:04:03PM -0800, Balbir Singh wrote:
> I think I found the root cause of the problem and a fix for it.
> The fix works for me.
> 

Thanks Balbir. But the appended fix is more clean and appropriate. Can you
please check if it works.
---

>From Balbir Singh:
> With the introduction of reserve_mattr() and free_mattr(), the ioremap*
> routines
> started exploiting it. The recent 2.6.24-rc8-mm1 kernel has a peculiar
> problem
> where in, certain devices disappear. In my case for example
>
> e100: Intel(R) PRO/100 Network Driver, 3. 5.23-k4-NAPI
> e100: Copyright(c) 1999-2006 Intel Corporation
> ACPI: PCI Interrupt 0000:04:08.0[A] -> GSI 20 (level, low) -> IRQ 20
> modprobe:2584 conflicting cache attribute 50000000-50001000
> uncached<->default
> e100: 0000:04:08.0: e100_probe: Cannot map device registers, aborting.
> ACPI: PCI interrupt for device 0000:04:08.0 disabled
>
> On further analysis, it was discovered that quirk_e100_interrupt() calls
> ioremap(), which reserves memory attributes for the e100 card, but
> iounmap()
> does not free it.

Fix the iounmap() to call free_matrr() unconditionally.

Signed-off-by: Suresh Siddha <suresh.b.siddha@...el.com>
Signed-off-by: Balbir Singh <balbir@...ux.vnet.ibm.com>
---

diff --git a/arch/x86/mm/ioremap_32.c b/arch/x86/mm/ioremap_32.c
index ae9c8b3..4d5bea8 100644
--- a/arch/x86/mm/ioremap_32.c
+++ b/arch/x86/mm/ioremap_32.c
@@ -201,12 +201,11 @@ void iounmap(volatile void __iomem *addr)
 		return;
 	}
 
+	free_mattr(p->phys_addr, p->phys_addr + get_vm_area_size(p),
+	           p->flags>>20);
 	/* Reset the direct mapping. Can block */
-	if (p->flags >> 20) {
-		free_mattr(p->phys_addr, p->phys_addr + get_vm_area_size(p),
-		           p->flags>>20);
+	if (p->flags >> 20)
 		ioremap_change_attr(p->phys_addr, get_vm_area_size(p), 0);
-	}
 
 	/* Finally remove it */
 	o = remove_vm_area((void *)addr);
diff --git a/arch/x86/mm/ioremap_64.c b/arch/x86/mm/ioremap_64.c
index 022b645..c766327 100644
--- a/arch/x86/mm/ioremap_64.c
+++ b/arch/x86/mm/ioremap_64.c
@@ -183,12 +183,11 @@ void iounmap(volatile void __iomem *addr)
 		return;
 	}
 
+	free_mattr(p->phys_addr, p->phys_addr + get_vm_area_size(p),
+	           p->flags>>20);
 	/* Reset the direct mapping. Can block */
-	if (p->flags >> 20) {
-		free_mattr(p->phys_addr, p->phys_addr + get_vm_area_size(p),
-		           p->flags>>20);
+	if (p->flags >> 20)
 		ioremap_change_attr(p->phys_addr, get_vm_area_size(p), 0);
-	}
 
 	/* Finally remove it */
 	o = remove_vm_area((void *)addr);
--
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