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Subject[PATCH] dax: fix memory leak when rmmod dax.ko
When I repeatedly modprobe and rmmod dax.ko, kmemleak report a
memory leak as follows:

unreferenced object 0xffff9a5588c05088 (size 8):
comm "modprobe", pid 261, jiffies 4294693644 (age 42.063s)
[<00000000e007ced0>] kstrdup+0x35/0x70
[<000000002ae73897>] kstrdup_const+0x3d/0x50
[<000000002b00c9c3>] kvasprintf_const+0xbc/0xf0
[<000000008023282f>] kobject_set_name_vargs+0x3b/0xd0
[<00000000d2cbaa4e>] kobject_set_name+0x62/0x90
[<00000000202e7a22>] bus_register+0x7f/0x2b0
[<000000000b77792c>] 0xffffffffc02840f7
[<000000002d5be5ac>] 0xffffffffc02840b4
[<00000000dcafb7cd>] do_one_initcall+0x58/0x240
[<00000000049fe480>] do_init_module+0x56/0x1e2
[<0000000022671491>] load_module+0x2517/0x2840
[<000000001a2201cb>] __do_sys_finit_module+0x9c/0xe0
[<000000003eb304e7>] do_syscall_64+0x33/0x40
[<0000000051c5fd06>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

When rmmod dax is executed, dax_bus_exit() is missing. This patch
can fix this bug.

Fixes: 9567da0b408a ("device-dax: Introduce bus + driver model")
Reported-by: Hulk Robot <>
Signed-off-by: Wang Hai <>
drivers/dax/super.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/dax/super.c b/drivers/dax/super.c
index edc279be3e59..cadbd0a1a1ef 100644
--- a/drivers/dax/super.c
+++ b/drivers/dax/super.c
@@ -752,6 +752,7 @@ static int __init dax_core_init(void)

static void __exit dax_core_exit(void)
+ dax_bus_exit();
unregister_chrdev_region(dax_devt, MINORMASK+1);
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