[PATCH] Fix proc_file_write missing ppos update

[Stefani Seibold <stefani@seibold.net>]

The following fix a long standing issue in the proc_file_write function,
which doesn't update the ppos file position pointer.

This prevent the usage of multiple sequently writes on an opened proc
file, because it is impossible to distinguish these due the offset is
always 0.

Signed-off-by: Stefani Seibold <stefani@seibold.net>

 generic.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- linux-2.6.31-rc4.orig/fs/proc/generic.c	2009-08-07 22:05:57.000000000 +0200
+++ linux-2.6.30-rc4/fs/proc/generic.c	2009-08-07 22:06:22.000000000 +0200
@@ -219,9 +219,10 @@
 		pde->pde_users++;
 		spin_unlock(&pde->pde_unload_lock);
 
-		/* FIXME: does this routine need ppos?  probably... */
 		rv = pde->write_proc(file, buffer, count, pde->data);
 		pde_users_dec(pde);
+		if (rv > 0)
+			*ppos += rv;
 	}
 	return rv;
 }