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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>
This commit is contained in:
Alexander Shishkin 2016-03-04 16:22:33 +02:00
parent f57af6df6a
commit 118b4515aa
1 changed files with 5 additions and 9 deletions
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14
drivers/hwtracing/stm/dummy_stm.c
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@ -46,9 +46,7 @@ static struct stm_data dummy_stm[DUMMY_STM_MAX];
static int nr_dummies = 4; static int nr_dummies = 4;
module_param(nr_dummies, int, 0600); module_param(nr_dummies, int, 0400);
static unsigned int dummy_stm_nr;
static unsigned int fail_mode; 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) 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; 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); dummy_stm[i].name = kasprintf(GFP_KERNEL, "dummy_stm.%d", i);
if (!dummy_stm[i].name) if (!dummy_stm[i].name)
goto fail_unregister; goto fail_unregister;
@ -86,8 +84,6 @@ static int dummy_stm_init(void)
goto fail_free; goto fail_free;
} }
dummy_stm_nr = __nr_dummies;
return 0; return 0;
fail_unregister: fail_unregister:
@ -105,7 +101,7 @@ static void dummy_stm_exit(void)
{ {
int i; int i;
for (i = 0; i < dummy_stm_nr; i++) { for (i = 0; i < nr_dummies; i++) {
stm_unregister_device(&dummy_stm[i]); stm_unregister_device(&dummy_stm[i]);
kfree(dummy_stm[i].name); kfree(dummy_stm[i].name);
} }