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SubjectRe: [PATCH v2 2/3] auxdisplay: ht16k33: rework input device initialization
On Thu,  9 Feb 2017 10:15:52 -0800
Dmitry Torokhov <> wrote:

> This patch fixes following issues in input device (keypad) handling:
> - requesting IRQ before allocating and initializing parts of the device
> that can be referenced from IRQ handler is racy, even if we try to
> disable interrupt after requesting it. Let's move allocations around
> so that everything is ready by the time we request IRQ.
> - using threaded interrupt handler to schedule a work item it sub-optimal.
> Disabling and then re-enabling interrupts in work item and in open/close
> methods is prone to races and exactly the reason theraded interrupts were
> introduced. Let's use the infrastructure properly and keep scanning the
> matrix array in IRQ thread, stopping when there are no keys, or when told
> to do so.
> Signed-off-by: Dmitry Torokhov <>
> ---
> v2: addressed Robin's feedback - changed interrupt trigger from

Works like a charm!

Tested-by: Robin van der Gracht <>

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