x86/ioapic: Return suitable error code in mp_map_gsi_to_irq()

mp_map_gsi_to_irq() in some cases might return legacy -1, which would be
wrongly interpreted as -EPERM.

Correct those cases to return proper error code.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: http://lkml.kernel.org/r/20170119192425.189899-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 945e512a112a321771797869b39c496d7f5c2b8f..f62c38d325da85304508663dd1cc5236e0fb6d66 100644 (file)
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -1107,12 +1107,12 @@ int mp_map_gsi_to_irq(u32 gsi, unsigned int flags, struct irq_alloc_info *info)
 
        ioapic = mp_find_ioapic(gsi);
        if (ioapic < 0)
-               return -1;
+               return -ENODEV;
 
        pin = mp_find_ioapic_pin(ioapic, gsi);
        idx = find_irq_entry(ioapic, pin, mp_INT);
        if ((flags & IOAPIC_MAP_CHECK) && idx < 0)
-               return -1;
+               return -ENODEV;
 
        return mp_map_pin_to_irq(gsi, idx, ioapic, pin, flags, info);
 }