From: Steve Wise <swise@opengridcomputing.com>
Date: Mon, 2 Oct 2006 09:17:00 +0000 (-0700)
Subject: [PATCH] LIB: add gen_pool_destroy()
X-Git-Tag: v2.6.19-rc1~488
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=322acc96d4bd3debea11cd0160b18bd5d7ff0d73;p=linux-2.6

[PATCH] LIB: add gen_pool_destroy()

Modules using the genpool allocator need to be able to destroy the data
structure when unloading.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Cc: Randy Dunlap <rdunlap@xenotime.net>
Cc: Dean Nelson <dcn@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/include/linux/genalloc.h b/include/linux/genalloc.h
index 690c42803d..9869ef3674 100644
--- a/include/linux/genalloc.h
+++ b/include/linux/genalloc.h
@@ -31,5 +31,6 @@ struct gen_pool_chunk {
 
 extern struct gen_pool *gen_pool_create(int, int);
 extern int gen_pool_add(struct gen_pool *, unsigned long, size_t, int);
+extern void gen_pool_destroy(struct gen_pool *);
 extern unsigned long gen_pool_alloc(struct gen_pool *, size_t);
 extern void gen_pool_free(struct gen_pool *, unsigned long, size_t);
diff --git a/lib/genalloc.c b/lib/genalloc.c
index 71338b48e8..7d16ecabba 100644
--- a/lib/genalloc.c
+++ b/lib/genalloc.c
@@ -70,6 +70,36 @@ int gen_pool_add(struct gen_pool *pool, unsigned long addr, size_t size,
 EXPORT_SYMBOL(gen_pool_add);
 
 
+/*
+ * Destroy a memory pool. Verifies that there are no outstanding allocations.
+ *
+ * @pool: pool to destroy
+ */
+void gen_pool_destroy(struct gen_pool *pool)
+{
+	struct list_head *_chunk, *_next_chunk;
+	struct gen_pool_chunk *chunk;
+	int order = pool->min_alloc_order;
+	int bit, end_bit;
+
+
+	write_lock(&pool->lock);
+	list_for_each_safe(_chunk, _next_chunk, &pool->chunks) {
+		chunk = list_entry(_chunk, struct gen_pool_chunk, next_chunk);
+		list_del(&chunk->next_chunk);
+
+		end_bit = (chunk->end_addr - chunk->start_addr) >> order;
+		bit = find_next_bit(chunk->bits, end_bit, 0);
+		BUG_ON(bit < end_bit);
+
+		kfree(chunk);
+	}
+	kfree(pool);
+	return;
+}
+EXPORT_SYMBOL(gen_pool_destroy);
+
+
 /*
  * Allocate the requested number of bytes from the specified pool.
  * Uses a first-fit algorithm.