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tracing: Remove usage of list iterator variable after the loop

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In preparation to limit the scope of a list iterator to the list
traversal loop, use a dedicated pointer to point to the found element
[1].

Link: https://lore.kernel.org/all/CAHk-=wgRr_D8CB-D9Kg-c=EHreAsk5SqXPwr9Y7k9sA6cWXJ6w@mail.gmail.com/ [1]
Link: https://lkml.kernel.org/r/20220427170734.819891-3-jakobkoschel@gmail.com

Cc: Ingo Molnar <mingo@redhat.com>
Signed-off-by: Jakob Koschel <jakobkoschel@gmail.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Jakob Koschel 2022-04-27 19:07:32 +02:00 committed by Steven Rostedt (Google)
parent 1da27a2505
commit 99d8ae4ec8
1 changed files with 7 additions and 8 deletions
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15
kernel/trace/trace_events.c
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@ -1723,9 +1723,9 @@ static LIST_HEAD(event_subsystems);
static int subsystem_open(struct inode *inode, struct file *filp)
{
struct trace_subsystem_dir *dir = NULL, *iter_dir;
struct trace_array *tr = NULL, *iter_tr;
struct event_subsystem *system = NULL;
struct trace_subsystem_dir *dir = NULL; /* Initialize for gcc */
struct trace_array *tr;
int ret;
if (tracing_is_disabled())
@ -1734,10 +1734,12 @@ static int subsystem_open(struct inode *inode, struct file *filp)
/* Make sure the system still exists */
mutex_lock(&event_mutex);
mutex_lock(&trace_types_lock);
list_for_each_entry(tr, &ftrace_trace_arrays, list) {
list_for_each_entry(dir, &tr->systems, list) {
if (dir == inode->i_private) {
list_for_each_entry(iter_tr, &ftrace_trace_arrays, list) {
list_for_each_entry(iter_dir, &iter_tr->systems, list) {
if (iter_dir == inode->i_private) {
/* Don't open systems with no events */
tr = iter_tr;
dir = iter_dir;
if (dir->nr_events) {
__get_system_dir(dir);
system = dir->subsystem;
@ -1753,9 +1755,6 @@ static int subsystem_open(struct inode *inode, struct file *filp)
if (!system)
return -ENODEV;
/* Some versions of gcc think dir can be uninitialized here */
WARN_ON(!dir);
/* Still need to increment the ref count of the system */
if (trace_array_get(tr) < 0) {
put_system(dir);