Re: [PATCH v2] staging: fbtft: make dirty_lock IRQ-safe

[Nam Cao]

Hui Su <sh_def@xxxxxxx> writes:
> fbtft_mkdirty() can be reached from the fbcon rendering path while
> processing printk() in hardirq context. Meanwhile, dirty_lock is also
> taken by fbtft_deferred_io() in workqueue context with local interrupts
> enabled.
...
> Use spin_lock_irqsave() for fbtft_mkdirty() and spin_lock_irq() for
> fbtft_deferred_io(). They only access the dirty line range, so the
> IRQ-off regions remain short.
>
> Fixes: c296d5f9957c ("staging: fbtft: core support")
> Signed-off-by: Hui Su <sh_def@xxxxxxx>

Reviewed-by: Nam Cao <namcao@xxxxxxxxxxxxx>