[patch 19/40] MSI: Use correct data offset for 32-bit MSI in read_msi_msg()

[Greg Kroah-Hartman <gregkh@suse.de>]

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

------------------
From: Roland Dreier <roland@digitalvampire.org>

patch cbf5d9e6b9bcf03291cbb51db144b3e2773a8a2d in mainline.

While reading the MSI code trying to find a reason why MSI wouldn't
work for devices that have a 32-bit MSI address capability, I noticed
that read_msi_msg() seems to read the message data from the wrong
offset in this case.

Signed-off-by: Roland Dreier <roland@digitalvampire.org>
Acked-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

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

--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -132,7 +132,7 @@ void read_msi_msg(unsigned int irq, stru
 			pci_read_config_word(dev, msi_data_reg(pos, 1), &data);
 		} else {
 			msg->address_hi = 0;
-			pci_read_config_word(dev, msi_data_reg(pos, 1), &data);
+			pci_read_config_word(dev, msi_data_reg(pos, 0), &data);
 		}
 		msg->data = data;
 		break;

-- 
-
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