Hi Anson,
On Wed, Mar 27, 2019 at 02:47:06AM +0000, Anson Huang wrote:
> SNVS IRQ is requested before necessary driver data initialized,
> if there is a pending IRQ during driver probe phase, kernel
> NULL pointer panic will occur in IRQ handler. To avoid such
> scenario, need to move the IRQ request to after driver data
> initialization done. This patch is inspired by NXP's internal
> kernel tree.
>
> Fixes: d3dc6e232215 ("input: keyboard: imx: add snvs power key driver")
> Signed-off-by: Anson Huang <[email protected]>
> ---
> drivers/input/keyboard/snvs_pwrkey.c | 17 ++++++++---------
> 1 file changed, 8 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/input/keyboard/snvs_pwrkey.c
> b/drivers/input/keyboard/snvs_pwrkey.c
> index effb632..6ff41fd 100644
> --- a/drivers/input/keyboard/snvs_pwrkey.c
> +++ b/drivers/input/keyboard/snvs_pwrkey.c
> @@ -148,15 +148,6 @@ static int imx_snvs_pwrkey_probe(struct platform_device
> *pdev)
> return error;
> }
>
> - error = devm_request_irq(&pdev->dev, pdata->irq,
> - imx_snvs_pwrkey_interrupt,
> - 0, pdev->name, pdev);
> -
> - if (error) {
> - dev_err(&pdev->dev, "interrupt not available.\n");
> - return error;
> - }
> -
> error = input_register_device(input);
> if (error < 0) {
> dev_err(&pdev->dev, "failed to register input device\n");
> @@ -166,6 +157,14 @@ static int imx_snvs_pwrkey_probe(struct platform_device
> *pdev)
> pdata->input = input;
> platform_set_drvdata(pdev, pdata);
>
> + error = devm_request_irq(&pdev->dev, pdata->irq,
> + imx_snvs_pwrkey_interrupt,
> + 0, pdev->name, pdev);
> + if (error) {
> + dev_err(&pdev->dev, "interrupt not available.\n");
> + return error;
> + }
Instead of moving devm_request_irq() around could you simply move
pdata->input = input assignment higher? It is perfectly fine to try
calling input_event() on input device that is allocated but not yet
registered.
> +
> device_init_wakeup(&pdev->dev, pdata->wakeup);
Unrelated suggestion:
Can you try calling dev_pm_set_wake_irq(&pdev->dev, pdata->irq) here and
I think you will be able to get rid of suspend/resume methods in the
driver.
Thanks.
--
Dmitry
