From 118b4515aa6916ee7751f29c8b2a3af95abc9783 Mon Sep 17 00:00:00 2001 From: Alexander Shishkin Date: Fri, 4 Mar 2016 16:22:33 +0200 Subject: [PATCH] stm class: dummy_stm: Make nr_dummies parameter read-only Changing nr_dummies after the module has been loaded doesn't actually change anything, so just make it read-only. Reported-by: Alan Cox Signed-off-by: Alexander Shishkin Reviewed-by: Laurent Fert --- drivers/hwtracing/stm/dummy_stm.c | 14 +++++--------- 1 file changed, 5 insertions(+), 9 deletions(-) diff --git a/drivers/hwtracing/stm/dummy_stm.c b/drivers/hwtracing/stm/dummy_stm.c index 310adf57e7a1..a86612d989f9 100644 --- a/drivers/hwtracing/stm/dummy_stm.c +++ b/drivers/hwtracing/stm/dummy_stm.c @@ -46,9 +46,7 @@ static struct stm_data dummy_stm[DUMMY_STM_MAX]; static int nr_dummies = 4; -module_param(nr_dummies, int, 0600); - -static unsigned int dummy_stm_nr; +module_param(nr_dummies, int, 0400); static unsigned int fail_mode; @@ -65,12 +63,12 @@ static int dummy_stm_link(struct stm_data *data, unsigned int master, static int dummy_stm_init(void) { - int i, ret = -ENOMEM, __nr_dummies = ACCESS_ONCE(nr_dummies); + int i, ret = -ENOMEM; - if (__nr_dummies < 0 || __nr_dummies > DUMMY_STM_MAX) + if (nr_dummies < 0 || nr_dummies > DUMMY_STM_MAX) return -EINVAL; - for (i = 0; i < __nr_dummies; i++) { + for (i = 0; i < nr_dummies; i++) { dummy_stm[i].name = kasprintf(GFP_KERNEL, "dummy_stm.%d", i); if (!dummy_stm[i].name) goto fail_unregister; @@ -86,8 +84,6 @@ static int dummy_stm_init(void) goto fail_free; } - dummy_stm_nr = __nr_dummies; - return 0; fail_unregister: @@ -105,7 +101,7 @@ static void dummy_stm_exit(void) { int i; - for (i = 0; i < dummy_stm_nr; i++) { + for (i = 0; i < nr_dummies; i++) { stm_unregister_device(&dummy_stm[i]); kfree(dummy_stm[i].name); } -- 2.20.1