path: root/include/linux/io.h
diff options
authorHaren Myneni <haren@us.ibm.com>2012-07-11 15:18:44 +1000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2012-07-11 18:22:32 +1000
commite1612de9e4cdf375c3cf1c72434ab8abdcb3927e (patch)
treed2bf73a13ea6e92c9c79d4300294584ef82767c2 /include/linux/io.h
parent475d0094293b51353e342d1198377967dbc48169 (diff)
powerpc: Disable /dev/port interface on systems without an ISA bridge
Some power systems do not have legacy ISA devices. So, /dev/port is not a valid interface on these systems. User level tools such as kbdrate is trying to access the device using this interface which is causing the system crash. This patch will fix this issue by not creating this interface on these powerpc systems. Signed-off-by: Haren Myneni <haren@us.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'include/linux/io.h')
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/io.h b/include/linux/io.h
index 7fd2d2138bf..069e4075f87 100644
--- a/include/linux/io.h
+++ b/include/linux/io.h
@@ -67,4 +67,13 @@ int check_signature(const volatile void __iomem *io_addr,
const unsigned char *signature, int length);
void devm_ioremap_release(struct device *dev, void *res);
+ * Some systems do not have legacy ISA devices.
+ * /dev/port is not a valid interface on these systems.
+ * So for those archs, <asm/io.h> should define the following symbol.
+ */
+#ifndef arch_has_dev_port
+#define arch_has_dev_port() (1)
#endif /* _LINUX_IO_H */