From: Kshitiz Varshney kshitiz.varshney@nxp.com
[ Upstream commit 10a2199caf437e893d9027d97700b3c6010048b7 ]
Issue: While servicing interrupt, if the IRQ happens to be because of a SEED_DONE due to a previous boot stage, you end up completing the completion prematurely, hence causing kernel to crash while booting.
Fix: Moving IRQ handler registering after imx_rngc_irq_mask_clear()
Fixes: 1d5449445bd0 (hwrng: mx-rngc - add a driver for Freescale RNGC) Signed-off-by: Kshitiz Varshney kshitiz.varshney@nxp.com Signed-off-by: Herbert Xu herbert@gondor.apana.org.au Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/char/hw_random/imx-rngc.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-)
--- a/drivers/char/hw_random/imx-rngc.c +++ b/drivers/char/hw_random/imx-rngc.c @@ -272,13 +272,6 @@ static int imx_rngc_probe(struct platfor goto err; }
- ret = devm_request_irq(&pdev->dev, - irq, imx_rngc_irq, 0, pdev->name, (void *)rngc); - if (ret) { - dev_err(rngc->dev, "Can't get interrupt working.\n"); - goto err; - } - init_completion(&rngc->rng_op_done);
rngc->rng.name = pdev->name; @@ -292,6 +285,13 @@ static int imx_rngc_probe(struct platfor
imx_rngc_irq_mask_clear(rngc);
+ ret = devm_request_irq(&pdev->dev, + irq, imx_rngc_irq, 0, pdev->name, (void *)rngc); + if (ret) { + dev_err(rngc->dev, "Can't get interrupt working.\n"); + return ret; + } + if (self_test) { ret = imx_rngc_self_test(rngc); if (ret) {