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SubjectRe: [PATCH] platform/x86: dell-wmi-sysman: work around for BIOS bug
From
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Hi,

On 12/2/20 2:19 PM, Divya Bharathi wrote:
> BIOS sets incorrect value (zero) when SET value passed for integer attribute
> with + sign. Added workaround to remove + sign before passing input to BIOS
>
> Co-developed-by: Mario Limonciello <mario.limonciello@dell.com>
> Signed-off-by: Mario Limonciello <mario.limonciello@dell.com>
> Co-developed-by: Prasanth KSR <prasanth.ksr@dell.com>
> Signed-off-by: Prasanth KSR <prasanth.ksr@dell.com>
> Signed-off-by: Divya Bharathi <divya.bharathi@dell.com>

Thank you for your patch, I've applied this patch to my review-hans
branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans

Note it will show up in my review-hans branch once I've pushed my
local branch there, which might take a while.

Once I've run some tests on this branch the patches there will be
added to the platform-drivers-x86/for-next branch and eventually
will be included in the pdx86 pull-request to Linus for the next
merge-window.

Regards,

Hans

> ---
> drivers/platform/x86/dell-wmi-sysman/int-attributes.c | 8 +++++++-
> 1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/platform/x86/dell-wmi-sysman/int-attributes.c b/drivers/platform/x86/dell-wmi-sysman/int-attributes.c
> index ea773d8e8d3a..75aedbb733be 100644
> --- a/drivers/platform/x86/dell-wmi-sysman/int-attributes.c
> +++ b/drivers/platform/x86/dell-wmi-sysman/int-attributes.c
> @@ -39,7 +39,7 @@ static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *a
> * @instance_id: The instance on which input is validated
> * @buf: Input value
> */
> -static int validate_integer_input(int instance_id, const char *buf)
> +static int validate_integer_input(int instance_id, char *buf)
> {
> int in_val;
> int ret;
> @@ -51,6 +51,12 @@ static int validate_integer_input(int instance_id, const char *buf)
> in_val > wmi_priv.integer_data[instance_id].max_value)
> return -EINVAL;
>
> + /* workaround for BIOS error.
> + * validate input to avoid setting 0 when integer input passed with + sign
> + */
> + if (*buf == '+')
> + memmove(buf, (buf + 1), strlen(buf + 1) + 1);
> +
> return ret;
> }
>
>

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