mfd: hi6421: calling irq_create_mapping in irq handler can cause failuretracking-hilt-ll-regulator-1206

irq_create_mapping() is called in hi6421's irq handler. When irq_create_mapping
returns at irq_find_mapping, it is safe. However, when a mapping doesn't exist
and it needs to allocate a irq_desc, the call path is like below, failing at
mutex_lock().

hi6421_irq_handler()
 |-> hi6421_to_irq()
  |-> irq_create_mapping()
   |-> irq_alloc_desc_from()
    |-> __irq_alloc_descs()
     |-> mutex_lock(&sparse_irq_lock);

The solution is to call irq_create_mapping for each of HI6421_NR_IRQ at _probe
time. And use irq_find_mapping in irq handler.

Signed-off-by: Guodong Xu <guodong.xu@linaro.org>

0 files changed, 0 insertions, 0 deletions