From c60369f011251c60de506994aab088f1afb90bf4 Mon Sep 17 00:00:00 2001 From: Seth Jennings Date: Wed, 18 Jul 2012 11:55:55 -0500 Subject: staging: zsmalloc: prevent mappping in interrupt context Because we use per-cpu mapping areas shared among the pools/users, we can't allow mapping in interrupt context because it can corrupt another users mappings. Signed-off-by: Seth Jennings Acked-by: Minchan Kim Signed-off-by: Greg Kroah-Hartman --- drivers/staging/zsmalloc/zsmalloc-main.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'drivers/staging/zsmalloc/zsmalloc-main.c') diff --git a/drivers/staging/zsmalloc/zsmalloc-main.c b/drivers/staging/zsmalloc/zsmalloc-main.c index 3c83c65ca5b8..b86133fdc2c8 100644 --- a/drivers/staging/zsmalloc/zsmalloc-main.c +++ b/drivers/staging/zsmalloc/zsmalloc-main.c @@ -75,6 +75,7 @@ #include #include #include +#include #include "zsmalloc.h" #include "zsmalloc_int.h" @@ -761,6 +762,13 @@ void *zs_map_object(struct zs_pool *pool, unsigned long handle, BUG_ON(!handle); + /* + * Because we use per-cpu mapping areas shared among the + * pools/users, we can't allow mapping in interrupt context + * because it can corrupt another users mappings. + */ + BUG_ON(in_interrupt()); + obj_handle_to_location(handle, &page, &obj_idx); get_zspage_mapping(get_first_page(page), &class_idx, &fg); class = &pool->size_class[class_idx]; -- cgit v1.2.3-55-g7522