From e5a91ee5443c05a2b484f78335d5d7d1d629f623 Mon Sep 17 00:00:00 2001 From: Sebastian Hesselbarth Date: Wed, 30 Jul 2014 10:39:37 +0200 Subject: pci: ensure device does ignore BAR mangling Disable access to PCI devices I/O and memory regions while mangling BAR registers. Signed-off-by: Sebastian Hesselbarth Acked-by: Lucas Stach Signed-off-by: Sascha Hauer --- drivers/pci/pci.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'drivers/pci') diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index f58e2c98f1..b64f25d132 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -191,6 +191,10 @@ unsigned int pci_scan_bus(struct pci_bus *bus) continue; } + pci_read_config_byte(dev, PCI_COMMAND, &cmd); + pci_write_config_byte(dev, PCI_COMMAND, + cmd & ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY)); + for (bar = 0; bar < 6; bar++) { resource_size_t last_addr; @@ -233,6 +237,7 @@ unsigned int pci_scan_bus(struct pci_bus *bus) bar++; } + pci_write_config_byte(dev, PCI_COMMAND, cmd); list_add_tail(&dev->bus_list, &bus->devices); pci_register_device(dev); } -- cgit v1.2.3