[PATCH] apm: clean up module initalization

Clean up module initalization for apm.c.  I had started by auditing for
proper return code checks in misc_register, but I found that in the event
of an initalization failure, a proc file and a kernel thread were left
hanging out.  this patch properly cleans up those loose ends on any
initalization failure.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Acked-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 8 insertions, 1 deletions

diff --git a/arch/i386/kernel/apm.c b/arch/i386/kernel/apm.c
index 8591f2fa920c..24fd577861f1 100644
--- a/arch/i386/kernel/apm.c
+++ b/arch/i386/kernel/apm.c
@@ -2339,6 +2339,7 @@ static int __init apm_init(void)
         ret = kernel_thread(apm, NULL, CLONE_KERNEL | SIGCHLD);
         if (ret < 0) {
                 printk(KERN_ERR "apm: disabled - Unable to start kernel thread.\n");
+                remove_proc_entry("apm", NULL);
                 return -ENOMEM;
         }
 
@@ -2348,7 +2349,13 @@ static int __init apm_init(void)
                 return 0;
         }
 
-        misc_register(&apm_device);
+        /*
+         * Note we don't actually care if the misc_device cannot be registered.
+         * this driver can do its job without it, even if userspace can't
+         * control it.  just log the error
+         */
+        if (misc_register(&apm_device))
+                printk(KERN_WARNING "apm: Could not register misc device.\n");
 
         if (HZ != 100)
                 idle_period = (idle_period * HZ) / 100;