From: Kenji Kaneshige Date: Wed, 7 Oct 2009 16:28:56 +0000 (-0700) Subject: PCI: Prevent AER driver from being loaded on non-root port PCIE devices X-Git-Tag: v2.6.31.7~5 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0823e602ad9d28d54fa6346289ff13ae84ad2c34;p=thirdparty%2Fkernel%2Fstable.git PCI: Prevent AER driver from being loaded on non-root port PCIE devices commit 30fc24b5cbc55f9e6c686e2710cc812419bddc0c upstream. A bug was seen on boards using a PLX 8518 switch device which advertises AER on each of it's transparent bridges. The AER driver was loaded for each bridge and this driver tried to access the AER source ID register whenever an interrupt occured on the shared PCI INTX lines. The source ID register does not exist on non root port PCIE device's which advertise AER and trying to access this register causes a unsupported request error on the bridge. Thus, when the next interrupt occurs, another error is found and the non existent source ID register is accessed again, and so it goes on. The result is a spammed dmesg with unsupported request PCI express errors on the bridge device that the AER driver is loaded against. Reported-by: Malcolm Crossley Signed-off-by: Kenji Kaneshige Tested-by: Malcolm Crossley Signed-off-by: Jesse Barnes Cc: Jean Delvare Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/pci/pcie/aer/aerdrv.c b/drivers/pci/pcie/aer/aerdrv.c index 4770f13b3ca18..e2504be1fa8d4 100644 --- a/drivers/pci/pcie/aer/aerdrv.c +++ b/drivers/pci/pcie/aer/aerdrv.c @@ -52,7 +52,7 @@ static struct pci_error_handlers aer_error_handlers = { static struct pcie_port_service_driver aerdriver = { .name = "aer", - .port_type = PCIE_ANY_PORT, + .port_type = PCIE_RC_PORT, .service = PCIE_PORT_SERVICE_AER, .probe = aer_probe,