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platform/x86: dell-wmi-sysman: work around for BIOS bug 

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>
Link: https://lore.kernel.org/r/20201202131935.307372-1-divya.bharathi@dell.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Divya Bharathi 2020-12-02 18:49:35 +05:30 committed by Hans de Goede
parent eca6ba20f3
commit 1f7cb4665d
1 changed files with 7 additions and 1 deletions
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8
drivers/platform/x86/dell-wmi-sysman/int-attributes.c
View File

@ -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;
}