Re: [PATCH 08/12] rtc: omap: restore irq state after reading TC registers

Felipe Balbi
2014-10-10T18:02:31Z

[-- Attachment #1.1: Type: text/plain, Size: 1019 bytes --]

Hi,

On Thu, Oct 09, 2014 at 09:06:30PM +0200, Johan Hovold wrote:
> Make sure to restore local irq state when reading the timer/calendar
> (TC) registers, so that omap_rtc_read_time() can be called with
> interrupts disabled.
>
> Signed-off-by: Johan Hovold <johan@kernel.org>
> ---
> drivers/rtc/rtc-omap.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c
> index 0ef016553a97..62e2e9a9887a 100644
> --- a/drivers/rtc/rtc-omap.c
> +++ b/drivers/rtc/rtc-omap.c
> @@ -239,8 +239,10 @@ static void bcd2tm(struct rtc_time *tm)
>
> static int omap_rtc_read_time(struct device *dev, struct rtc_time *tm)
> {
> + unsigned long flags;
> +
> /* we don't report wday/yday/isdst ... */
> - local_irq_disable();
> + local_irq_save(flags);

you should really convert these to a real spin_lock_irq*(), that's
because local_irq* do not get re-written with RT patchset, so this
pretty much "breaks" RT.

--
balbi

[-- Attachment #1.2: Digital signature --]
[-- Type: application/pgp-signature, Size: 819 bytes --]

[-- Attachment #2: Type: text/plain, Size: 176 bytes --]

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org