diff options
| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-07-01 14:07:37 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-07-03 15:16:54 +0200 |
| commit | d69d804845985c29ab5be5a4b3b1f4787893daf8 (patch) | |
| tree | da2a783fd130da553c526692669eb847972b86d4 /drivers/platform/x86/wmi.c | |
| parent | 6b521fc111a2ad5ead39776960d3d2d289ce0722 (diff) | |
driver core: have match() callback in struct bus_type take a const *
In the match() callback, the struct device_driver * should not be
changed, so change the function callback to be a const *. This is one
step of many towards making the driver core safe to have struct
device_driver in read-only memory.
Because the match() callback is in all busses, all busses are modified
to handle this properly. This does entail switching some container_of()
calls to container_of_const() to properly handle the constant *.
For some busses, like PCI and USB and HV, the const * is cast away in
the match callback as those busses do want to modify those structures at
this point in time (they have a local lock in the driver structure.)
That will have to be changed in the future if they wish to have their
struct device * in read-only-memory.
Cc: Rafael J. Wysocki <rafael@kernel.org>
Reviewed-by: Alex Elder <elder@kernel.org>
Acked-by: Sumit Garg <sumit.garg@linaro.org>
Link: https://lore.kernel.org/r/2024070136-wrongdoer-busily-01e8@gregkh
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/platform/x86/wmi.c')
| -rw-r--r-- | drivers/platform/x86/wmi.c | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c index d21f3fa25823..389e7878e937 100644 --- a/drivers/platform/x86/wmi.c +++ b/drivers/platform/x86/wmi.c @@ -727,10 +727,7 @@ char *wmi_get_acpi_device_uid(const char *guid_string) } EXPORT_SYMBOL_GPL(wmi_get_acpi_device_uid); -static inline struct wmi_driver *drv_to_wdrv(struct device_driver *drv) -{ - return container_of(drv, struct wmi_driver, driver); -} +#define drv_to_wdrv(__drv) container_of_const(__drv, struct wmi_driver, driver) /* * sysfs interface @@ -848,9 +845,9 @@ static void wmi_dev_release(struct device *dev) kfree(wblock); } -static int wmi_dev_match(struct device *dev, struct device_driver *driver) +static int wmi_dev_match(struct device *dev, const struct device_driver *driver) { - struct wmi_driver *wmi_driver = drv_to_wdrv(driver); + const struct wmi_driver *wmi_driver = drv_to_wdrv(driver); struct wmi_block *wblock = dev_to_wblock(dev); const struct wmi_device_id *id = wmi_driver->id_table; |