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 <alan.cox@intel.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Reviewed-by: Laurent Fert <laurent.fert@intel.com>

1 files 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);
         }