linux-kernel - [PATCH 4.0 57/58] of/pci: Fix pci_address_to_pio() conversion of CPU address to I/O port

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Date:	Sun, 19 Jul 2015 12:11:35 -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, Zhichang Yuan <yuanzhichang@...ilicon.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Liviu Dudau <Liviu.Dudau@....com>
Subject: [PATCH 4.0 57/58] of/pci: Fix pci_address_to_pio() conversion of CPU address to I/O port

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

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

From: Zhichang Yuan <yuanzhichang@...ilicon.com>

commit 5dbb4c6167229c8d4f528e8ec26699a7305000a3 upstream.

41f8bba7f555 ("of/pci: Add pci_register_io_range() and
pci_pio_to_address()") added support for systems with several I/O ranges
described by OF bindings.  It modified pci_address_to_pio() look up the
io_range for a given CPU physical address, but the conversion was wrong.

Fix the conversion of address to I/O port.

[bhelgaas: changelog]
Fixes: 41f8bba7f555 ("of/pci: Add pci_register_io_range() and pci_pio_to_address()")
Signed-off-by: Zhichang Yuan <yuanzhichang@...ilicon.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Acked-by: Liviu Dudau <Liviu.Dudau@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/of/address.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -765,7 +765,7 @@ unsigned long __weak pci_address_to_pio(
 	spin_lock(&io_range_lock);
 	list_for_each_entry(res, &io_range_list, list) {
 		if (address >= res->start && address < res->start + res->size) {
-			addr = res->start - address + offset;
+			addr = address - res->start + offset;
 			break;
 		}
 		offset += res->size;


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