[PATCH 5.6 21/38] hwrng: imx-rngc - fix an error path

Greg Kroah-Hartman
2020-04-11T12:21:02Z

From: Martin Kaiser <martin@kaiser.cx>

commit 47a1f8e8b3637ff5f7806587883d7d94068d9ee8 upstream.

Make sure that the rngc interrupt is masked if the rngc self test fails.
Self test failure means that probe fails as well. Interrupts should be
masked in this case, regardless of the error.

Cc: stable@vger.kernel.org
Fixes: 1d5449445bd0 ("hwrng: mx-rngc - add a driver for Freescale RNGC")
Reviewed-by: PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com>
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/char/hw_random/imx-rngc.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/char/hw_random/imx-rngc.c
+++ b/drivers/char/hw_random/imx-rngc.c
@@ -105,8 +105,10 @@ static int imx_rngc_self_test(struct imx
return -ETIMEDOUT;
}

- if (rngc->err_reg != 0)
+ if (rngc->err_reg != 0) {
+ imx_rngc_irq_mask_clear(rngc);
return -EIO;
+ }

return 0;
}