On Fri, Aug 6, 2021 at 1:24 PM Loic Poulain <loic.poulain@xxxxxxxxxx> wrote:
> Lockdep detected possible interrupt unsafe locking scenario:
>
> CPU0 CPU1
> ---- ----
> lock(&mhiwwan->rx_lock);
> local_irq_disable();
> lock(&mhi_cntrl->pm_lock);
> lock(&mhiwwan->rx_lock);
> <Interrupt>
> lock(&mhi_cntrl->pm_lock);
>
> *** DEADLOCK ***
>
> To prevent this we need to disable the soft-interrupts when taking
> the rx_lock.
>
> Cc: stable@xxxxxxxxxxxxxxx
> Fixes: fa588eba632d ("net: Add Qcom WWAN control driver")
> Reported-by: Thomas Perrot <thomas.perrot@xxxxxxxxxxx>
> Signed-off-by: Loic Poulain <loic.poulain@xxxxxxxxxx>
Reviewed-by: Sergey Ryazanov <ryazanov.s.a@xxxxxxxxx>
