The two EFM ioports are accessed by drivers for other parts of the Nuvoton
Super-IO chips too. Therefore access to these ioports needs to be
protected by using request_muxed_region (like it's implemented e.g. in
hwmon/nct6775 already).
Signed-off-by: Heiner Kallweit <hkallweit1@xxxxxxxxx>
---
drivers/media/rc/nuvoton-cir.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/media/rc/nuvoton-cir.c b/drivers/media/rc/nuvoton-cir.c
index 081435c..62c82c5 100644
--- a/drivers/media/rc/nuvoton-cir.c
+++ b/drivers/media/rc/nuvoton-cir.c
@@ -80,17 +80,24 @@ static inline void nvt_clear_reg_bit(struct nvt_dev *nvt, u8 val, u8 reg)
}
/* enter extended function mode */
-static inline void nvt_efm_enable(struct nvt_dev *nvt)
+static inline int nvt_efm_enable(struct nvt_dev *nvt)
{
+ if (!request_muxed_region(nvt->cr_efir, 2, NVT_DRIVER_NAME))
+ return -EBUSY;
+
/* Enabling Extended Function Mode explicitly requires writing 2x */
outb(EFER_EFM_ENABLE, nvt->cr_efir);
outb(EFER_EFM_ENABLE, nvt->cr_efir);
+
+ return 0;
}
/* exit extended function mode */
static inline void nvt_efm_disable(struct nvt_dev *nvt)
{
outb(EFER_EFM_DISABLE, nvt->cr_efir);
+
+ release_region(nvt->cr_efir, 2);
}
/*
--
2.6.4
--
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