On Tue, Mar 14, 2017 at 10:37:29AM +0100, Michael Olbrich wrote:
> Some EFI implementations have a even slower tick rate and the meassured
> frequency may be zero.
>
> Signed-off-by: Michael Olbrich <m.olbrich@xxxxxxxxxxxxxx>
> Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@xxxxxxxxxxxx>
> ---
> drivers/clocksource/efi.c | 4 ++++
> 1 file changed, 4 insertions(+)
Applied, thanks
Sascha
>
> diff --git a/drivers/clocksource/efi.c b/drivers/clocksource/efi.c
> index 89906c452eb7..fb5b7ca63de9 100644
> --- a/drivers/clocksource/efi.c
> +++ b/drivers/clocksource/efi.c
> @@ -71,6 +71,10 @@ static int efi_cs_init(struct clocksource *cs)
> uint64_t nb_100ns;
>
> freq = ticks_freq_x86();
> + if (freq == 0) {
> + BS->close_event(efi_cs_evt);
> + return -ENODEV;
> + }
> nb_100ns = 10 * 1000 * 1000 / freq;
> pr_warn("EFI Event timer too slow freq = %llu Hz\n", freq);
> efiret = BS->set_timer(efi_cs_evt, EFI_TIMER_PERIODIC, nb_100ns);
> --
> 2.11.0
>
>
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