[PATCH linux-2.6-14-mm2] block: problem unloading I/O-Scheduler Module

[Dirk Henning Gerdes <mail@dirk-gerdes.de>]

If you have compiled an I/O-Scheduler as module you cannot unload it,
because of a memory-error.

Signed-off-by: Dirk Gerdes mail@dirk-gerdes.de

--- linux-2.6.14-mm2-pagecache/block/elevator.c	2005-11-17
12:37:10.000000000 +0100
+++ linux-2.6.14-mm2-pagecache_fix/block/elevator.c	2005-11-17
14:05:41.000000000 +0100
@@ -656,7 +656,7 @@
 		struct io_context *ioc = p->io_context;
 		struct cfq_io_context *cic;
 
-		if (ioc->cic_root.rb_node != NULL) {
+		if (ioc != NULL && ioc->cic_root.rb_node != NULL) {
 			cic = rb_entry(rb_first(&ioc->cic_root), struct cfq_io_context,
rb_node);
 			cic->exit(ioc);
 			cic->dtor(ioc);


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