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platform/x86: wmi: make GUID block packed

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The `guid_block` struct is overlaid onto a buffer
coming from the _WDG ACPI object of the device.
For this reason mark the struct packed and add
assertions about sizes.

Signed-off-by: Barnabás Pőcze <pobrn@protonmail.com>
Link: https://lore.kernel.org/r/20210904175450.156801-16-pobrn@protonmail.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Barnabás Pőcze 2021-09-04 17:55:42 +00:00 committed by Hans de Goede
parent 67f472fdac
commit dea878d88f
1 changed files with 5 additions and 1 deletions
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6
drivers/platform/x86/wmi.c
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@ -18,6 +18,7 @@
#include <linux/acpi.h>
#include <linux/bits.h>
#include <linux/build_bug.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/kernel.h>
@ -50,7 +51,10 @@ struct guid_block {
};
u8 instance_count;
u8 flags;
};
} __packed;
static_assert(sizeof(typeof_member(struct guid_block, guid)) == 16);
static_assert(sizeof(struct guid_block) == 20);
static_assert(__alignof__(struct guid_block) == 1);
struct wmi_block {
struct wmi_device dev;