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dpll: export __dpll_device_change_ntf() for use under dpll_lock

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Export __dpll_device_change_ntf() so that drivers can send device
change notifications from within device callbacks, which are already
called under dpll_lock. Using dpll_device_change_ntf() in that
context would deadlock.

Add lockdep_assert_held() to catch misuse without the lock held.

Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Link: https://patch.msgid.link/20260526074525.1451008-2-ivecera@redhat.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Ivan Vecera 2026-05-26 09:45:23 +02:00 committed by Paolo Abeni
parent 1af2af707f
commit 20040b2a3c
2 changed files with 12 additions and 2 deletions
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13
drivers/dpll/dpll_netlink.c
View File

@ -829,12 +829,21 @@ int dpll_device_delete_ntf(struct dpll_device *dpll)
return dpll_device_event_send(DPLL_CMD_DEVICE_DELETE_NTF, dpll);
}
static int
__dpll_device_change_ntf(struct dpll_device *dpll)
/**
* __dpll_device_change_ntf - notify that the dpll device has been changed
* @dpll: registered dpll pointer
*
* Context: caller must hold dpll_lock. Suitable for use inside device
* callbacks which are already invoked under dpll_lock.
* Return: 0 if succeeds, error code otherwise.
*/
int __dpll_device_change_ntf(struct dpll_device *dpll)
{
lockdep_assert_held(&dpll_lock);
dpll_device_notify(dpll, DPLL_DEVICE_CHANGED);
return dpll_device_event_send(DPLL_CMD_DEVICE_CHANGE_NTF, dpll);
}
EXPORT_SYMBOL_GPL(__dpll_device_change_ntf);
/**
* dpll_device_change_ntf - notify that the dpll device has been changed

1
include/linux/dpll.h
View File

@ -284,6 +284,7 @@ void dpll_pin_on_pin_unregister(struct dpll_pin *parent, struct dpll_pin *pin,
int dpll_pin_ref_sync_pair_add(struct dpll_pin *pin,
struct dpll_pin *ref_sync_pin);
int __dpll_device_change_ntf(struct dpll_device *dpll);
int dpll_device_change_ntf(struct dpll_device *dpll);
int __dpll_pin_change_ntf(struct dpll_pin *pin);