usb: dwc3: omap: remove IRQ_NOAUTOEN used with shared irq

IRQ_NOAUTOEN cannot be used with shared IRQs, since commit 04c848d39879
("genirq: Warn when IRQ_NOAUTOEN is used with shared interrupts") and
kernel now throws a warn dump. But OMAP DWC3 driver uses this flag. As
per commit 12a7f17fac5b ("usb: dwc3: omap: fix race of pm runtime with
irq handler in probe") that introduced this flag, PM runtime can race
with IRQ handler when deferred probing happens due to extcon,
therefore IRQ_NOAUTOEN needs to be set so that irq is not enabled until
extcon is registered.

Remove setting of IRQ_NOAUTOEN and move the registration of
shared irq to a point after dwc3_omap_extcon_register() and
of_platform_populate(). This avoids possibility of probe deferring and
above said race condition.

Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Vignesh R <vigneshr@ti.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

1 files changed, 8 insertions, 10 deletions

diff --git a/drivers/usb/dwc3/dwc3-omap.c b/drivers/usb/dwc3/dwc3-omap.c
index 98926504b55b..f5aaa0cf3873 100644
--- a/drivers/usb/dwc3/dwc3-omap.c
+++ b/drivers/usb/dwc3/dwc3-omap.c
@@ -512,15 +512,6 @@ static int dwc3_omap_probe(struct platform_device *pdev)
 
         /* check the DMA Status */
         reg = dwc3_omap_readl(omap->base, USBOTGSS_SYSCONFIG);
-        irq_set_status_flags(omap->irq, IRQ_NOAUTOEN);
-        ret = devm_request_threaded_irq(dev, omap->irq, dwc3_omap_interrupt,
-                                        dwc3_omap_interrupt_thread, IRQF_SHARED,
-                                        "dwc3-omap", omap);
-        if (ret) {
-                dev_err(dev, "failed to request IRQ #%d --> %d\n",
-                                omap->irq, ret);
-                goto err1;
-        }
 
         ret = dwc3_omap_extcon_register(omap);
         if (ret < 0)
@@ -532,8 +523,15 @@ static int dwc3_omap_probe(struct platform_device *pdev)
                 goto err1;
         }
 
+        ret = devm_request_threaded_irq(dev, omap->irq, dwc3_omap_interrupt,
+                                        dwc3_omap_interrupt_thread, IRQF_SHARED,
+                                        "dwc3-omap", omap);
+        if (ret) {
+                dev_err(dev, "failed to request IRQ #%d --> %d\n",
+                        omap->irq, ret);
+                goto err1;
+        }
         dwc3_omap_enable_irqs(omap);
-        enable_irq(omap->irq);
         return 0;
 
 err1: