From 5cac1f67ea0363d463a58ec2d9118268fe2ba5d6 Mon Sep 17 00:00:00 2001 From: Heiner Kallweit Date: Thu, 7 Jul 2016 03:17:39 -0300 Subject: [PATCH] [media] rc: nuvoton: fix hang if chip is configured for alternative EFM IO address MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit If a system configures the Nuvoton chip to use the alternative EFM IO address (CR_EFIR2) then after probing the primary EFM IO address (CR_EFIR) this region is not released. If a driver for another function of the Nuvoton Super I/O chip uses the same probing mechanism then it will hang if loaded after the nuvoton-cir driver. This was reported for the nct6775 hwmon driver. Fix this by properly releasing the region after probing CR_EFIR. This regression was introduced with kernel 4.6 so cc it to stable. Reported-by: Antti Seppälä Signed-off-by: Heiner Kallweit Tested-by: Antti Seppälä Cc: # 4.6.x- Signed-off-by: Mauro Carvalho Chehab --- drivers/media/rc/nuvoton-cir.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/media/rc/nuvoton-cir.c b/drivers/media/rc/nuvoton-cir.c index 36abfc2800f0..00215f343819 100644 --- a/drivers/media/rc/nuvoton-cir.c +++ b/drivers/media/rc/nuvoton-cir.c @@ -393,6 +393,7 @@ static int nvt_hw_detect(struct nvt_dev *nvt) /* Check if we're wired for the alternate EFER setup */ nvt->chip_major = nvt_cr_read(nvt, CR_CHIP_ID_HI); if (nvt->chip_major == 0xff) { + nvt_efm_disable(nvt); nvt->cr_efir = CR_EFIR2; nvt->cr_efdr = CR_EFDR2; nvt_efm_enable(nvt);