It looks like an unlock may be missing before the returnon line 81.
julia
tree: git://git.infradead.org/users/dvhart/linux-platform-drivers-x86.git testing
head: 9b0d7c8018708b798c0bd6d4fe9512754c1e8c18
commit: d183a21a0df57d187dbccd710ebb5a5e457251f4 [4/7] platform/x86: Add custom surface3 platform device for controlling LID
:::::: branch date: 84 minutes ago
:::::: commit date: 2 hours ago
>> drivers/platform/x86/surface3-wmi.c:81:2-8: preceding lock on line 68
git remote add platform-drivers-x86 git://git.infradead.org/users/dvhart/linux-platform-drivers-x86.git
git remote update platform-drivers-x86
git checkout d183a21a0df57d187dbccd710ebb5a5e457251f4
vim +81 drivers/platform/x86/surface3-wmi.c
d183a21a Benjamin Tissoires 2016-11-25 62 {
d183a21a Benjamin Tissoires 2016-11-25 63 acpi_status status;
d183a21a Benjamin Tissoires 2016-11-25 64 union acpi_object *obj;
d183a21a Benjamin Tissoires 2016-11-25 65
d183a21a Benjamin Tissoires 2016-11-25 66 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
d183a21a Benjamin Tissoires 2016-11-25 67
d183a21a Benjamin Tissoires 2016-11-25 @68 mutex_lock(&s3_wmi_lock);
d183a21a Benjamin Tissoires 2016-11-25 69 status = wmi_query_block(guid, instance, &output);
d183a21a Benjamin Tissoires 2016-11-25 70
d183a21a Benjamin Tissoires 2016-11-25 71 obj = output.pointer;
d183a21a Benjamin Tissoires 2016-11-25 72
d183a21a Benjamin Tissoires 2016-11-25 73 if (!obj || obj->type != ACPI_TYPE_INTEGER) {
d183a21a Benjamin Tissoires 2016-11-25 74 if (obj) {
d183a21a Benjamin Tissoires 2016-11-25 75 pr_err("query block returned object type: %d - buffer length:%d\n",
d183a21a Benjamin Tissoires 2016-11-25 76 obj->type,
d183a21a Benjamin Tissoires 2016-11-25 77 obj->type == ACPI_TYPE_BUFFER ?
d183a21a Benjamin Tissoires 2016-11-25 78 obj->buffer.length : 0);
d183a21a Benjamin Tissoires 2016-11-25 79 }
d183a21a Benjamin Tissoires 2016-11-25 80 kfree(obj);
d183a21a Benjamin Tissoires 2016-11-25 @81 return -EINVAL;
d183a21a Benjamin Tissoires 2016-11-25 82 }
d183a21a Benjamin Tissoires 2016-11-25 83 *ret = obj->integer.value;
d183a21a Benjamin Tissoires 2016-11-25 84 kfree(obj);
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