On Thu, Jun 16, 2011 at 10:28:29AM -0400, Konrad Rzeszutek Wilk wrote:
>
> And as mentioned, the other patch that just deals with pstates.
>
> From 0f3bc30b6bc7dad62e3b77063b69df44ca9a9f8e Mon Sep 17 00:00:00 2001
> From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> Date: Wed, 15 Jun 2011 11:08:02 -0400
> Subject: [PATCH] [CPUFREQ] powernow-k8: Don't try to transition if the pstate is incorrect or there is no freq for it.
>
> This patch auguments the pstate transition code to error out
augments
> (instead of returning 0) when a incorrect pstate is provided.
an
> It also checks whether the frequency for the pstate is
> incorrect and if so errors out.
>
> Suggested-by: Borislav Petkov <bp@xxxxxxxxx>
> CC: andre.przywara@xxxxxxx
> CC: Mark.Langsdorf@xxxxxxx
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> ---
> drivers/cpufreq/powernow-k8.c | 6 +++++-
> 1 files changed, 5 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/cpufreq/powernow-k8.c b/drivers/cpufreq/powernow-k8.c
> index fe53572..047c7b11 100644
> --- a/drivers/cpufreq/powernow-k8.c
> +++ b/drivers/cpufreq/powernow-k8.c
> @@ -1103,11 +1103,15 @@ static int transition_frequency_pstate(struct powernow_k8_data *data,
> /* get MSR index for hardware pstate transition */
> pstate = index & HW_PSTATE_MASK;
> if (pstate > data->max_hw_pstate)
> - return 0;
> + return -EINVAL;
> +
Hehe, this was a bug, actually, good catch!
powernowk8_target is actually considering ret = 0 a success and ret != 0
a failure but we were returning a 0 when our target pstate is bogus.
> freqs.old = find_khz_freq_from_pstate(data->powernow_table,
> data->currpstate);
> freqs.new = find_khz_freq_from_pstate(data->powernow_table, pstate);
>
> + if (freqs.new == CPUFREQ_ENTRY_INVALID)
> + return -EINVAL;
> +
No need for that since freqs.new is determined from pstate and you're
checking pstate above.
> for_each_cpu(i, data->available_cores) {
> freqs.cpu = i;
> cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
Thanks.
--
Regards/Gruss,
Boris.
Advanced Micro Devices GmbH
Einsteinring 24, 85609 Dornach
General Managers: Alberto Bozzo, Andrew Bowd
Registration: Dornach, Gemeinde Aschheim, Landkreis Muenchen
Registergericht Muenchen, HRB Nr. 43632
--
To unsubscribe from this list: send the line "unsubscribe cpufreq" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
