path: root/drivers/hwtracing
diff options
authorAndy Shevchenko <>2021-04-15 12:15:55 +0300
committerGreg Kroah-Hartman <>2021-04-16 07:26:50 +0200
commit41c9f7fb64f8423750b0ccd916a8a3cf4f5c99c1 (patch)
treea464ac628be498ffbde8b963041c70a36df3dd64 /drivers/hwtracing
parent48cb17531b15967d9d3f34c770a25cc6c4ca6ad1 (diff)
stm class: Use correct UUID APIs
It appears that the STM code didn't manage to accurately decypher the delicate inner workings of an alternative thought process behind the UUID API and directly called generate_random_uuid() that clearly needs to be a static function in lib/uuid.c. At the same time, said STM code is poking directly at the byte array inside the uuid_t when it uses the UUID for its internal purposes. Fix these two transgressions by using intended APIs instead. Signed-off-by: Andy Shevchenko <> [ash: changed back to uuid_t and updated the commit message] Signed-off-by: Alexander Shishkin <> Link: Signed-off-by: Greg Kroah-Hartman <>
Diffstat (limited to 'drivers/hwtracing')
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/hwtracing/stm/p_sys-t.c b/drivers/hwtracing/stm/p_sys-t.c
index 360b5c03df95..8254971c02e7 100644
--- a/drivers/hwtracing/stm/p_sys-t.c
+++ b/drivers/hwtracing/stm/p_sys-t.c
@@ -92,7 +92,7 @@ static void sys_t_policy_node_init(void *priv)
struct sys_t_policy_node *pn = priv;
- generate_random_uuid(pn->uuid.b);
+ uuid_gen(&pn->uuid);
static int sys_t_output_open(void *priv, struct stm_output *output)
@@ -292,6 +292,7 @@ static ssize_t sys_t_write(struct stm_data *data, struct stm_output *output,
unsigned int m = output->master;
const unsigned char nil = 0;
u32 header = DATA_HEADER;
+ u8 uuid[UUID_SIZE];
ssize_t sz;
/* We require an existing policy node to proceed */
@@ -322,7 +323,8 @@ static ssize_t sys_t_write(struct stm_data *data, struct stm_output *output,
return sz;
/* GUID */
- sz = stm_data_write(data, m, c, false, op->node.uuid.b, UUID_SIZE);
+ export_uuid(uuid, &op->node.uuid);
+ sz = stm_data_write(data, m, c, false, uuid, sizeof(op->node.uuid));
if (sz <= 0)
return sz;