[tip: irq/core] genirq: Clarify documentation for request_threaded_irq()

[tip-bot2 for Joel Savitz]

The following commit has been merged into the irq/core branch of tip:

Commit-ID:     61377ec144574313ebfbf31685895a7b9b9b7a9a
Gitweb:        https://git.kernel.org/tip/61377ec144574313ebfbf31685895a7b9b9b7a9a
Author:        Joel Savitz <jsavitz@xxxxxxxxxx>
AuthorDate:    Sat, 31 Jul 2021 01:07:40 -04:00
Committer:     Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitterDate: Tue, 10 Aug 2021 15:06:04 +02:00

genirq: Clarify documentation for request_threaded_irq()

Clarify wording and document commonly used IRQF_ONESHOT flag.

Signed-off-by: Joel Savitz <jsavitz@xxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210731050740.444454-1-jsavitz@xxxxxxxxxx

---
 kernel/irq/manage.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index ef30b47..766468a 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -2072,9 +2072,9 @@ const void *free_nmi(unsigned int irq, void *dev_id)
  *	request_threaded_irq - allocate an interrupt line
  *	@irq: Interrupt line to allocate
  *	@handler: Function to be called when the IRQ occurs.
- *		  Primary handler for threaded interrupts
- *		  If NULL and thread_fn != NULL the default
- *		  primary handler is installed
+ *		  Primary handler for threaded interrupts.
+ *		  If handler is NULL and thread_fn != NULL
+ *		  the default primary handler is installed.
  *	@thread_fn: Function called from the irq handler thread
  *		    If NULL, no irq thread is created
  *	@irqflags: Interrupt type flags
@@ -2108,6 +2108,8 @@ const void *free_nmi(unsigned int irq, void *dev_id)
  *
  *	IRQF_SHARED		Interrupt is shared
  *	IRQF_TRIGGER_*		Specify active edge(s) or level
+ *	IRQF_ONESHOT		Do not unmask interrupt line until
+ *				thread_fn returns
  *
  */
 int request_threaded_irq(unsigned int irq, irq_handler_t handler,