Since commit 
1c6c69525b40eb76de8adf039409722015927dc3 ("genirq: Reject
bogus threaded irq requests") threaded IRQs without a primary handler
need to be requested with IRQF_ONESHOT, otherwise the request will fail.
So pass the IRQF_ONESHOT flag in this case.
The semantic patch that makes this change is available
in scripts/coccinelle/misc/irqf_oneshot.cocci.
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
 
                if (wm8994->micdet_irq)
                        ret = request_threaded_irq(wm8994->micdet_irq, NULL,
                                                   wm8994_mic_irq,
-                                                  IRQF_TRIGGER_RISING,
+                                                  IRQF_TRIGGER_RISING |
+                                                  IRQF_ONESHOT,
                                                   "Mic1 detect",
                                                   wm8994);
                 else
                if (wm8994->micdet_irq) {
                        ret = request_threaded_irq(wm8994->micdet_irq, NULL,
                                                   wm8958_mic_irq,
-                                                  IRQF_TRIGGER_RISING,
+                                                  IRQF_TRIGGER_RISING |
+                                                  IRQF_ONESHOT,
                                                   "Mic detect",
                                                   wm8994);
                        if (ret != 0)