PCI: fix hotplug get_##name return value problem

Currently, get_##name in pci_hotplug_core.c will return 0 if module
unload wins the race between unload & reading the hotplug file.  Fix
that case to return -ENODEV like it should.

Reviewed-by: Alex Chiang <achiang@hp.com>
Reviewed-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Yu Zhao <yu.zhao@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

diff --git a/drivers/pci/hotplug/pci_hotplug_core.c b/drivers/pci/hotplug/pci_hotplug_core.c
index 5f85b1b120e3ddc12c350e2b821c18946ec90e27..27d2b6fe5d532e156697290e3c4eaa380787b030 100644 (file)
--- a/drivers/pci/hotplug/pci_hotplug_core.c
+++ b/drivers/pci/hotplug/pci_hotplug_core.c
@@ -102,13 +102,13 @@ static int get_##name (struct hotplug_slot *slot, type *value)            \
 {                                                                      \
        struct hotplug_slot_ops *ops = slot->ops;                       \
        int retval = 0;                                                 \
-       if (try_module_get(ops->owner)) {                               \
-               if (ops->get_##name)                                    \
-                       retval = ops->get_##name(slot, value);          \
-               else                                                    \
-                       *value = slot->info->name;                      \
-               module_put(ops->owner);                                 \
-       }                                                               \
+       if (try_module_get(ops->owner))                                 \
+               return -ENODEV;                                         \
+       if (ops->get_##name)                                            \
+               retval = ops->get_##name(slot, value);                  \
+       else                                                            \
+               *value = slot->info->name;                              \
+       module_put(ops->owner);                                         \
        return retval;                                                  \
 }