When list_for_each_entry() completes the iteration over the whole list without breaking the loop, the iterator value will be a bogus pointer computed based on the head element. While it is safe to use the pointer to determine if it was computed based on the head element, either with list_entry_is_head() or &pos->member == head, using the iterator variable after the loop should be avoided. In preparation to limiting 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@xxxxxxxxxxxxxx/ [1] Signed-off-by: Jakob Koschel <jakobkoschel@xxxxxxxxx> --- sound/soc/sprd/sprd-mcdt.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/sound/soc/sprd/sprd-mcdt.c b/sound/soc/sprd/sprd-mcdt.c index f6a55fa60c1b..6e27789a0df5 100644 --- a/sound/soc/sprd/sprd-mcdt.c +++ b/sound/soc/sprd/sprd-mcdt.c @@ -866,20 +866,19 @@ EXPORT_SYMBOL_GPL(sprd_mcdt_chan_dma_disable); struct sprd_mcdt_chan *sprd_mcdt_request_chan(u8 channel, enum sprd_mcdt_channel_type type) { - struct sprd_mcdt_chan *temp; + struct sprd_mcdt_chan *temp = NULL; + struct sprd_mcdt_chan *iter; mutex_lock(&sprd_mcdt_list_mutex); - list_for_each_entry(temp, &sprd_mcdt_chan_list, list) { - if (temp->type == type && temp->id == channel) { - list_del_init(&temp->list); + list_for_each_entry(iter, &sprd_mcdt_chan_list, list) { + if (iter->type == type && iter->id == channel) { + list_del_init(&iter->list); + temp = iter; break; } } - if (list_entry_is_head(temp, &sprd_mcdt_chan_list, list)) - temp = NULL; - mutex_unlock(&sprd_mcdt_list_mutex); return temp; -- 2.25.1
