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mfd: Read wm831x AUXADC conversion results before acknowledging interrupt

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Ensure that there's no possibility of loosing an AUXADC interrupt by reading
the conversion result in the IRQ handler when using interrupts. Otherwise
it's possible that under very heavy load a new conversion could be initiated
before the acknowledgement for a previous interrupt has happened.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Mark Brown
2011-06-02 19:18:52 +01:00
committed by Samuel Ortiz
parent 5c05a8d1f0
commit c1a82780b4
2 changed files with 32 additions and 16 deletions
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include/linux/mfd/wm831x/core.h
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@@ -278,6 +278,7 @@ struct wm831x {
struct mutex auxadc_lock;
struct completion auxadc_done;
u16 auxadc_data;
/* The WM831x has a security key blocking access to certain
* registers. The mutex is taken by the accessors for locking