Hello Kshitiz, On 29.07.22 12:02, Kshitiz Varshney wrote: > Issue: > While servicing interrupt, trying to access variable rng_op_done, > which is not yet initalized hence causing kernel to crash > while booting. > > Fix: > Moving initialization of rng_op_done before request_irq. > > Fixes: 1d5449445bd0 (hwrng: mx-rngc - add a driver for Freescale RNGC) > Signed-off-by: Kshitiz Varshney <kshitiz.varshney@xxxxxxx> Thanks for your patch. > + init_completion(&rngc->rng_op_done); > + > ret = devm_request_irq(&pdev->dev, > irq, imx_rngc_irq, 0, pdev->name, (void *)rngc); This should probably be moved below imx_rngc_irq_mask_clear(rngc). init_completion can stay where it is. That way: - You initialize rngc fully before registering the IRQ handler - You don't handle pending IRQs that you want to dismiss anyway - If the IRQ happens to be because of a SEED_DONE due to a previous boot stage, you don't end up completing the completion prematurely. Cheers, Ahmad > if (ret) { > @@ -277,7 +279,6 @@ static int imx_rngc_probe(struct platform_device *pdev) > goto err; > } > > - init_completion(&rngc->rng_op_done); > > rngc->rng.name = pdev->name; > rngc->rng.init = imx_rngc_init; -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |