linux-kernel - [ 67/79] ARM: footbridge: fix overlapping PCI mappings

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Date:	Fri, 26 Jul 2013 13:47:57 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Mike Frysinger <vapier@...too.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Olof Johansson <olof@...om.net>
Subject: [ 67/79] ARM: footbridge: fix overlapping PCI mappings

3.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mike Frysinger <vapier@...too.org>

commit 6287e7319870ec949fb809e4eb4154c2b05b221f upstream.

Commit 8ef6e6201b26cb9fde79c1baa08145af6aca2815 (ARM: footbridge: use
fixed PCI i/o mapping) broke booting on my netwinder.  Before that,
everything boots fine.  Since then, it crashes on boot.

With earlyprintk, I see it BUG-ing like so:
kernel BUG at lib/ioremap.c:27!
Internal error: Oops - BUG: 0 [#1] ARM
...
[<c0139b54>] (ioremap_page_range+0x128/0x154) from [<c02e6a6c>] (dc21285_setup+0xd0/0x114)
[<c02e6a6c>] (dc21285_setup+0xd0/0x114) from [<c02e4874>] (pci_common_init+0xa0/0x298)
[<c02e4874>] (pci_common_init+0xa0/0x298) from [<c02e793c>] (netwinder_pci_init+0xc/0x18)
[<c02e793c>] (netwinder_pci_init+0xc/0x18) from [<c02e27d0>] (do_one_initcall+0xb4/0x180)
...

Russell points out it's because of overlapping PCI mappings that was
added with the aforementioned commit.  Rob thought the code would re-use
the static mapping, but that turns out to not be the case and instead
hits the BUG further down.

After deleting this hunk as suggested by Russel, the system boots up fine
again and all my PCI devices work (IDE, ethernet, the DC21285).

Signed-off-by: Mike Frysinger <vapier@...too.org>
Acked-by: Rob Herring <rob.herring@...xeda.com>
Signed-off-by: Olof Johansson <olof@...om.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm/mach-footbridge/dc21285.c |    2 --
 1 file changed, 2 deletions(-)

--- a/arch/arm/mach-footbridge/dc21285.c
+++ b/arch/arm/mach-footbridge/dc21285.c
@@ -276,8 +276,6 @@ int __init dc21285_setup(int nr, struct
 
 	sys->mem_offset  = DC21285_PCI_MEM;
 
-	pci_ioremap_io(0, DC21285_PCI_IO);
-
 	pci_add_resource_offset(&sys->resources, &res[0], sys->mem_offset);
 	pci_add_resource_offset(&sys->resources, &res[1], sys->mem_offset);
 


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