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powerpc: Disable /dev/port interface on systems without an ISA bridge

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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>
This commit is contained in:
Haren Myneni
2012-07-11 15:18:44 +10:00
committed by Benjamin Herrenschmidt
parent 475d009429
commit e1612de9e4
3 changed files with 27 additions and 1 deletions
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8
arch/powerpc/include/asm/io.h
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@@ -20,6 +20,14 @@ extern int check_legacy_ioport(unsigned long base_port);
#define _PNPWRP 0xa79
#define PNPBIOS_BASE 0xf000
#if defined(CONFIG_PPC64) && defined(CONFIG_PCI)
extern struct pci_dev *isa_bridge_pcidev;
/*
* has legacy ISA devices ?
*/
#define arch_has_dev_port() (isa_bridge_pcidev != NULL)
#endif
#include <linux/device.h>
#include <linux/io.h>