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dpll: export __dpll_pin_change_ntf() for use under dpll_lock

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

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

Acked-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Signed-off-by: Petr Oros <poros@redhat.com>
Tested-by: Alexander Nowlin <alexander.nowlin@intel.com>
Reviewed-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@intel.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Link: https://patch.msgid.link/20260427-jk-iwl-net-petr-oros-fixes-v1-9-cdcb48303fd8@intel.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Ivan Vecera 2026-04-27 22:22:21 -07:00 committed by Paolo Abeni
parent 6f9d8393c9
commit 620055cb10
3 changed files with 11 additions and 2 deletions
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10
drivers/dpll/dpll_netlink.c
View File

@ -900,11 +900,21 @@ int dpll_pin_delete_ntf(struct dpll_pin *pin)
return dpll_pin_event_send(DPLL_CMD_PIN_DELETE_NTF, pin);
}
/**
* __dpll_pin_change_ntf - notify that the pin has been changed
* @pin: registered pin pointer
*
* Context: caller must hold dpll_lock. Suitable for use inside pin
* callbacks which are already invoked under dpll_lock.
* Return: 0 if succeeds, error code otherwise.
*/
int __dpll_pin_change_ntf(struct dpll_pin *pin)
{
lockdep_assert_held(&dpll_lock);
dpll_pin_notify(pin, DPLL_PIN_CHANGED);
return dpll_pin_event_send(DPLL_CMD_PIN_CHANGE_NTF, pin);
}
EXPORT_SYMBOL_GPL(__dpll_pin_change_ntf);
/**
* dpll_pin_change_ntf - notify that the pin has been changed

2
drivers/dpll/dpll_netlink.h
View File

@ -11,5 +11,3 @@ int dpll_device_delete_ntf(struct dpll_device *dpll);
int dpll_pin_create_ntf(struct dpll_pin *pin);
int dpll_pin_delete_ntf(struct dpll_pin *pin);
int __dpll_pin_change_ntf(struct dpll_pin *pin);

1
include/linux/dpll.h
View File

@ -286,6 +286,7 @@ int dpll_pin_ref_sync_pair_add(struct dpll_pin *pin,
int dpll_device_change_ntf(struct dpll_device *dpll);
int __dpll_pin_change_ntf(struct dpll_pin *pin);
int dpll_pin_change_ntf(struct dpll_pin *pin);
int register_dpll_notifier(struct notifier_block *nb);