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authorMikulas Patocka <mpatocka@redhat.com>2013-12-05 17:33:29 -0500
committerMike Snitzer <snitzer@redhat.com>2013-12-10 19:13:20 -0500
commit4cb57ab4a2e61978f3a9b7d4f53988f30d61c27f (patch)
treef9060e86cc23801b02bfa98db5bf0f59206b2b93 /drivers/md/dm-bufio.c
parent088448007bb97af47ec3f05fc3e9517ffb5e9fba (diff)
downloadop-kernel-dev-4cb57ab4a2e61978f3a9b7d4f53988f30d61c27f.zip
op-kernel-dev-4cb57ab4a2e61978f3a9b7d4f53988f30d61c27f.tar.gz
dm bufio: initialize read-only module parameters
Some module parameters in dm-bufio are read-only. These parameters inform the user about memory consumption. They are not supposed to be changed by the user. However, despite being read-only, these parameters can be set on modprobe or insmod command line, for example: modprobe dm-bufio current_allocated_bytes=12345 The kernel doesn't expect that these variables can be non-zero at module initialization and if the user sets them, it results in BUG. This patch initializes the variables in the module init routine, so that user-supplied values are ignored. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Cc: stable@vger.kernel.org # 3.2+
Diffstat (limited to 'drivers/md/dm-bufio.c')
-rw-r--r--drivers/md/dm-bufio.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c
index 173cbb2..54bdd923 100644
--- a/drivers/md/dm-bufio.c
+++ b/drivers/md/dm-bufio.c
@@ -1717,6 +1717,11 @@ static int __init dm_bufio_init(void)
{
__u64 mem;
+ dm_bufio_allocated_kmem_cache = 0;
+ dm_bufio_allocated_get_free_pages = 0;
+ dm_bufio_allocated_vmalloc = 0;
+ dm_bufio_current_allocated = 0;
+
memset(&dm_bufio_caches, 0, sizeof dm_bufio_caches);
memset(&dm_bufio_cache_names, 0, sizeof dm_bufio_cache_names);
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