Re: VFS locking & HFS problems (2.4.6pre6)

[Andrew Morton <andrewm@uow.edu.au>]

Benjamin Herrenschmidt wrote:
> 
> I've had a deadlock twice with 2.4.6pre6 today. It's an SMP kernel
> running on an UP box (a PowerBook Pismo).
> 
> The deadlock happen in the HFS filesystem in hfs_cat_put(), apparently
> (quickly looking at addresses) in spin_lock().
> 

Please test this:

Index: fs/hfs/catalog.c
===================================================================
RCS file: /opt/cvs/lk/fs/hfs/catalog.c,v
retrieving revision 1.2
diff -u -r1.2 catalog.c
--- fs/hfs/catalog.c	2001/02/17 01:44:39	1.2
+++ fs/hfs/catalog.c	2001/06/29 15:54:17
@@ -549,7 +549,7 @@
 		   entry->state &= ~HFS_LOCK;
 		   hfs_wake_up(&entry->wait);
 		}
-
+		spin_lock(&entry_lock);
 		return entry;
 	}
 
@@ -559,7 +559,6 @@
 	if (grow_entries())
 	        goto add_new_entry;
 
-	spin_unlock(&entry_lock);
 	return NULL;
 
 read_fail: 
@@ -570,7 +569,6 @@
 	init_entry(entry);
 	list_add(&entry->list, &entry_unused);
 	entries_stat.nr_free_entries++;
-	spin_unlock(&entry_lock);
 	return NULL;
 }