torvalds/linux
3
0
Fork 0
mirror of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-04-04 05:29:15 +08:00
Code Issues Packages Projects Releases Wiki Activity

PM: runtime: Introduce __rpm_get_driver_callback()

Browse Source 
Add a special function for computing the address of the runtime PM
callback given by an offset relative to the start of the device
driver's struct dev_pm_ops and use it to obtain the driver callback
in __rpm_get_callback().

Also put the shared part of the callback address computation into a
separate helper function to avoid code duplication and explicit
pointer type casts.

The new __rpm_get_driver_callback() will be used subsequently for
implementing callback lookup in pm_runtime_force_suspend/resume().

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Link: https://patch.msgid.link/2054356.usQuhbGJ8B@rjwysocki.net
This commit is contained in:
Rafael J. Wysocki
2025-06-27 21:20:40 +02:00
parent ab5ce09709
commit 2b2dcf0811
1 changed files with 18 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
drivers/base/power/runtime.c
View File

@@ -19,10 +19,24 @@
typedef int (*pm_callback_t)(struct device *);
static inline pm_callback_t get_callback_ptr(const void *start, size_t offset)
{
return *(pm_callback_t *)(start + offset);
}
static pm_callback_t __rpm_get_driver_callback(struct device *dev,
size_t cb_offset)
{
if (dev->driver && dev->driver->pm)
return get_callback_ptr(dev->driver->pm, cb_offset);
return NULL;
}
static pm_callback_t __rpm_get_callback(struct device *dev, size_t cb_offset)
{
pm_callback_t cb;
const struct dev_pm_ops *ops;
pm_callback_t cb = NULL;
if (dev->pm_domain)
ops = &dev->pm_domain->ops;
@@ -36,12 +50,10 @@ static pm_callback_t __rpm_get_callback(struct device *dev, size_t cb_offset)
ops = NULL;
if (ops)
cb = *(pm_callback_t *)((void *)ops + cb_offset);
else
cb = NULL;
cb = get_callback_ptr(ops, cb_offset);
if (!cb && dev->driver && dev->driver->pm)
cb = *(pm_callback_t *)((void *)dev->driver->pm + cb_offset);
if (!cb)
cb = __rpm_get_driver_callback(dev, cb_offset);
return cb;
}