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SubjectRe: [RFC][PATCH] cpufreq: e_powersaver: Fix checking brand for EPS_BRAND_C3

> Do not return -ENODEV for EPS_BRAND_C3.
>
> Signed-off-by: Axel Lin<axel.lin@gmail.com>
> ---
> I just found the code is suspect.
> I don't have this hardware handy.
> Anyone can help to confirm and test if this patch works?
> Axel
>
> drivers/cpufreq/e_powersaver.c | 3 ++-
> 1 files changed, 2 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/cpufreq/e_powersaver.c b/drivers/cpufreq/e_powersaver.c
> index 35a257d..637f055 100644
> --- a/drivers/cpufreq/e_powersaver.c
> +++ b/drivers/cpufreq/e_powersaver.c
> @@ -199,8 +199,9 @@ static int eps_cpu_init(struct cpufreq_policy *policy)
> break;
> case EPS_BRAND_C3:
> printk(KERN_CONT "C3\n");
> - return -ENODEV;
> break;
> + default:
> + return -ENODEV;
> }
> /* Enable Enhanced PowerSaver */
> rdmsrl(MSR_IA32_MISC_ENABLE, val);
EPS_BRAND_C3 isn't handled by this driver. So you have to return -ENODEV
for it. Why this code is suspect?
If you looking for an error it is probably in:
> rdmsr(0x1154, lo, hi);
> brand = (((lo >> 4) ^ (lo >> 2))) & 0x000000ff;
which was added later to this driver. Probably & 0xff should be replaced
by & 3.

Best regards
Rafał Bilski


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