Author: hselasky
Date: Fri Jun 5 06:23:03 2015
New Revision: 284012
URL: https://svnweb.freebsd.org/changeset/base/284012
Log:
Disable VGA PCI interrupts until a chipset driver is loaded for VGA
PCI devices. Else unhandled display adapter interrupts might freeze
the CPU or consume a lot of CPU.
PR: 156596
MFC after: 1 week
Modified:
head/sys/dev/pci/vga_pci.c
Modified: head/sys/dev/pci/vga_pci.c
==============================================================================
--- head/sys/dev/pci/vga_pci.c Fri Jun 5 06:06:07 2015 (r284011)
+++ head/sys/dev/pci/vga_pci.c Fri Jun 5 06:23:03 2015 (r284012)
@@ -126,6 +126,13 @@ vga_pci_is_boot_display(device_t dev)
if ((config & (PCIM_CMD_PORTEN | PCIM_CMD_MEMEN)) == 0)
return (0);
+ /*
+ * Disable interrupts until a chipset driver is loaded for
+ * this PCI device. Else unhandled display adapter interrupts
+ * might freeze the CPU.
+ */
+ pci_write_config(dev, PCIR_COMMAND, config | PCIM_CMD_INTxDIS, 2);
+
/* This video card is the boot display: record its unit number. */
vga_pci_default_unit = unit;
device_set_flags(dev, 1);
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