[PATCH RFC 3/4] kernel/resource: Make ioport_resource.start configurable

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Make IO space base address to be configurable through IO_SPACE_BASE.

This will allow architectures which do not natively support IO ports -
like arm64 - to harden against legacy ISA-based drivers which use
hardcoded addresses to access IO ports.

Any attempts for these drivers to request a resource region will now fail
for architectures with set IO_SPACE_BASE above legacy ISA IO port region
(0xffff).

Signed-off-by: John Garry <john.garry@xxxxxxxxxx>
---
 kernel/resource.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/resource.c b/kernel/resource.c
index 3ae2f56cc79d..d191c4d796c7 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -29,7 +29,7 @@
 
 struct resource ioport_resource = {
 	.name	= "PCI IO",
-	.start	= 0,
+	.start	= IO_SPACE_BASE,
 	.end	= IO_SPACE_LIMIT,
 	.flags	= IORESOURCE_IO,
 };
-- 
2.26.2




[Index of Archives]     [Linux Kernel]     [Kernel Newbies]     [x86 Platform Driver]     [Netdev]     [Linux Wireless]     [Netfilter]     [Bugtraq]     [Linux Filesystems]     [Yosemite Discussion]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Samba]     [Device Mapper]

  Powered by Linux