irq/work: Use llist_for_each_entry_safe

irq/work: Use llist_for_each_entry_safe

The llist_for_each_entry() loop in irq_work_run_list() is unsafe because
once the works PENDING bit is cleared it can be requeued on another CPU.

Use llist_for_each_entry_safe() instead.

Fixes: 16c0890dc66d ("irq/work: Don't reinvent the wheel but use existing llist API")
Reported-by:Chris Wilson <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Byungchul Park <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Petri Latvala <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]