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char: misc: remove usage of list iterator past the loop body

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

Link: https://lore.kernel.org/all/YhdfEIwI4EdtHdym@kroah.com/
Signed-off-by: Jakob Koschel <jakobkoschel@gmail.com>
Link: https://lore.kernel.org/r/20220319201454.2511733-1-jakobkoschel@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jakob Koschel 2022-03-19 21:14:54 +01:00 committed by Greg Kroah-Hartman
parent a8a570c6d0
commit 3a5e65023f
1 changed files with 13 additions and 11 deletions
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24
drivers/char/misc.c
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@ -100,17 +100,18 @@ static const struct seq_operations misc_seq_ops = {
static int misc_open(struct inode *inode, struct file *file)
{
int minor = iminor(inode);
struct miscdevice *c;
struct miscdevice *c = NULL, *iter;
int err = -ENODEV;
const struct file_operations *new_fops = NULL;
mutex_lock(&misc_mtx);
list_for_each_entry(c, &misc_list, list) {
if (c->minor == minor) {
new_fops = fops_get(c->fops);
break;
}
list_for_each_entry(iter, &misc_list, list) {
if (iter->minor != minor)
continue;
c = iter;
new_fops = fops_get(iter->fops);
break;
}
if (!new_fops) {
@ -118,11 +119,12 @@ static int misc_open(struct inode *inode, struct file *file)
request_module("char-major-%d-%d", MISC_MAJOR, minor);
mutex_lock(&misc_mtx);
list_for_each_entry(c, &misc_list, list) {
if (c->minor == minor) {
new_fops = fops_get(c->fops);
break;
}
list_for_each_entry(iter, &misc_list, list) {
if (iter->minor != minor)
continue;
c = iter;
new_fops = fops_get(iter->fops);
break;
}
if (!new_fops)
goto fail;