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uio: use threaded interrupts

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Split the existing uio_interrupt into a hardirq handler and a thread
function. The hardirq handler deals with the interrupt source in
hardware, the thread function notifies userspace that there is an event
to be handled.

Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Link: https://lore.kernel.org/r/20240408234050.2056374-3-chris.packham@alliedtelesis.co.nz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chris Packham 2024-04-09 11:40:49 +12:00 • committed by Greg Kroah-Hartman
parent 90fa028055
commit f8a27dfa4b
1 changed files with 13 additions and 4 deletions
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17
drivers/uio/uio.c
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@ -442,18 +442,27 @@ EXPORT_SYMBOL_GPL(uio_event_notify);
* @irq: IRQ number, can be UIO_IRQ_CYCLIC for cyclic timer * @irq: IRQ number, can be UIO_IRQ_CYCLIC for cyclic timer
* @dev_id: Pointer to the devices uio_device structure * @dev_id: Pointer to the devices uio_device structure
*/ */
static irqreturn_t uio_interrupt(int irq, void *dev_id) static irqreturn_t uio_interrupt_handler(int irq, void *dev_id)
{ {
struct uio_device *idev = (struct uio_device *)dev_id; struct uio_device *idev = (struct uio_device *)dev_id;
irqreturn_t ret; irqreturn_t ret;
ret = idev->info->handler(irq, idev->info); ret = idev->info->handler(irq, idev->info);
if (ret == IRQ_HANDLED) if (ret == IRQ_HANDLED)
uio_event_notify(idev->info); ret = IRQ_WAKE_THREAD;
return ret; return ret;
} }
static irqreturn_t uio_interrupt_thread(int irq, void *dev_id)
{
struct uio_device *idev = (struct uio_device *)dev_id;
uio_event_notify(idev->info);
return IRQ_HANDLED;
}
struct uio_listener { struct uio_listener {
struct uio_device *dev; struct uio_device *dev;
s32 event_count; s32 event_count;
@ -1024,8 +1033,8 @@ int __uio_register_device(struct module *owner,
* FDs at the time of unregister and therefore may not be * FDs at the time of unregister and therefore may not be
* freed until they are released. * freed until they are released.
*/ */
ret = request_irq(info->irq, uio_interrupt, ret = request_threaded_irq(info->irq, uio_interrupt_handler, uio_interrupt_thread,
info->irq_flags, info->name, idev); info->irq_flags, info->name, idev);
if (ret) { if (ret) {
info->uio_dev = NULL; info->uio_dev = NULL;
goto err_request_irq; goto err_request_irq;