Messages in this thread | | | Date | Mon, 3 Jul 2017 23:19:45 +0200 | From | Maxime Ripard <> | Subject | Re: [PATCH] iio: adc: sun4i-gpadc-iio: fix unbalanced irq enable/disable |
| |
On Mon, Jul 03, 2017 at 03:09:26PM +0200, Quentin Schulz wrote: > When initializing interrupts, the devm_request_any_context_irq will > enable them right away. An atomic flag was set in sun4i_irq_init and read > in the interrupt handler to make sure no unwanted interrupts were > handled. If an unwanted interrupt occurred, the handler would disable > the irq and return IRQ_HANDLED. However, at the end of sun4i_irq_init, > the irq would be disabled as well, resulting in an unbalanced enable > (since there are more disables than enables, the code enabling the > interrupt would never be called). > > When reading the ADC or the temperature, the respective irq would be > enabled in the read function and disabled in the irq handler. In the > read function, we would wait for a completion (with a timeout) that will > be set in the irq handler. However, if the completion is never set or if > the wait for completion times out, the irq would not be disabled in the > read function resulting in an unbalanced enable once the read function > is called again (since there are 2+ enables for no disable). > > Moving disable_irq from the irq handler to the read function get rid of > these two cases of unbalanced enable. > > Fixes: d1caa9905538 ("iio: adc: add support for Allwinner SoCs ADC") > > Reported-by: Andreas Färber <afaerber@suse.de> > Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Thanks! Maxime
-- Maxime Ripard, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com [unhandled content-type:application/pgp-signature] | |