Commit 37a76bd4 authored by Arjan van de Ven's avatar Arjan van de Ven Committed by Linus Torvalds

async: fix __lowest_in_progress()

At 37000 feet somewhere near Greenland I woke up from a half-sleep with the
realisation that __lowest_in_progress() is buggy. After landing I checked
and there were indeed 2 problems with it; this patch fixes both:
* The order of the list checks was wrong
* The locking was not correct.
Signed-off-by: default avatarArjan van de Ven <arjan@linux.intel.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent d32ad102
......@@ -90,12 +90,12 @@ extern int initcall_debug;
static async_cookie_t __lowest_in_progress(struct list_head *running)
{
struct async_entry *entry;
if (!list_empty(&async_pending)) {
entry = list_first_entry(&async_pending,
if (!list_empty(running)) {
entry = list_first_entry(running,
struct async_entry, list);
return entry->cookie;
} else if (!list_empty(running)) {
entry = list_first_entry(running,
} else if (!list_empty(&async_pending)) {
entry = list_first_entry(&async_pending,
struct async_entry, list);
return entry->cookie;
} else {
......@@ -104,6 +104,17 @@ static async_cookie_t __lowest_in_progress(struct list_head *running)
}
}
static async_cookie_t lowest_in_progress(struct list_head *running)
{
unsigned long flags;
async_cookie_t ret;
spin_lock_irqsave(&async_lock, flags);
ret = __lowest_in_progress(running);
spin_unlock_irqrestore(&async_lock, flags);
return ret;
}
/*
* pick the first pending entry and run it
*/
......@@ -229,7 +240,7 @@ void async_synchronize_cookie_special(async_cookie_t cookie, struct list_head *r
starttime = ktime_get();
}
wait_event(async_done, __lowest_in_progress(running) >= cookie);
wait_event(async_done, lowest_in_progress(running) >= cookie);
if (initcall_debug && system_state == SYSTEM_BOOTING) {
endtime = ktime_get();
......
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