Change in coreboot[master]: device: Enable bus mastering on system-class devices conditionally

[Patrick Georgi (Code Review)]

Patrick Georgi has submitted this change. ( https://review.coreboot.org/c/coreboot/+/45151 )

Change subject: device: Enable bus mastering on system-class devices conditionally
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device: Enable bus mastering on system-class devices conditionally

Devices of class type "system" are arbitrary devices and it's not clear
which of them need bus mastering. Therefore, enable bus mastering
conditionally based on Kconfig option PCI_ALLOW_BUS_MASTER_ANY_DEVICE.

Change-Id: Ia04e83606a0a081c0758ec59e52627aa1dbd2622
Signed-off-by: Felix Singer 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45151
Tested-by: build bot (Jenkins) 
Reviewed-by: Nico Huber 
---
M src/device/pci_device.c
1 file changed, 2 insertions(+), 1 deletion(-)

Approvals:
  build bot (Jenkins): Verified
  Nico Huber: Looks good to me, approved

diff --git a/src/device/pci_device.c b/src/device/pci_device.c
index f4608fc..c3f3564 100644
--- a/src/device/pci_device.c
+++ b/src/device/pci_device.c
@@ -1129,7 +1129,8 @@
    dev->class = class >> 8;

/* Architectural/System devices always need to be bus masters. */
-	if ((dev->class >> 16) == PCI_BASE_CLASS_SYSTEM)
+	if ((dev->class >> 16) == PCI_BASE_CLASS_SYSTEM &&
+	    CONFIG(PCI_ALLOW_BUS_MASTER_ANY_DEVICE))
    	dev->command |= PCI_COMMAND_MASTER;

/*