mailbox: bcm-ferxrm-mailbox: Use default primary handler

request_threaded_irq() is invoked with a primary and a secondary handler
and no flags are passed. The primary handler is the same as
irq_default_primary_handler() so there is no need to have an identical
copy.

The lack of the IRQF_ONESHOT flag can be dangerous because the interrupt
source is not masked while the threaded handler is active. This means,
especially on LEVEL typed interrupt lines, the interrupt can fire again
before the threaded handler had a chance to run.

Use the default primary interrupt handler by specifying NULL and set
IRQF_ONESHOT so the interrupt source is masked until the secondary handler
is done.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260128095540.863589-5-bigeasy@linutronix.de

diff --git a/drivers/mailbox/bcm-flexrm-mailbox.c b/drivers/mailbox/bcm-flexrm-mailbox.c
index 41f79e51d9e5a92089a3fd798e848d837fb2775a..4255fefc3a5a056bd80e171e5869eed7e6895267 100644 (file)
--- a/drivers/mailbox/bcm-flexrm-mailbox.c
+++ b/drivers/mailbox/bcm-flexrm-mailbox.c
@@ -1173,14 +1173,6 @@ static int flexrm_debugfs_stats_show(struct seq_file *file, void *offset)
 
 /* ====== FlexRM interrupt handler ===== */
 
-static irqreturn_t flexrm_irq_event(int irq, void *dev_id)
-{
-       /* We only have MSI for completions so just wakeup IRQ thread */
-       /* Ring related errors will be informed via completion descriptors */
-
-       return IRQ_WAKE_THREAD;
-}
-
 static irqreturn_t flexrm_irq_thread(int irq, void *dev_id)
 {
        flexrm_process_completions(dev_id);
@@ -1271,10 +1263,8 @@ static int flexrm_startup(struct mbox_chan *chan)
                ret = -ENODEV;
                goto fail_free_cmpl_memory;
        }
-       ret = request_threaded_irq(ring->irq,
-                                  flexrm_irq_event,
-                                  flexrm_irq_thread,
-                                  0, dev_name(ring->mbox->dev), ring);
+       ret = request_threaded_irq(ring->irq, NULL, flexrm_irq_thread,
+                                  IRQF_ONESHOT, dev_name(ring->mbox->dev), ring);
        if (ret) {
                dev_err(ring->mbox->dev,
                        "failed to request ring%d IRQ\n", ring->num);