linux-kernel - [PATCH v2 11/11] drm/udl: Sync pending URBs at the end of suspend

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Date:   Tue,  6 Sep 2022 09:39:51 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Thomas Zimmermann <tzimmermann@...e.de>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 11/11] drm/udl: Sync pending URBs at the end of suspend

It's better to perform the sync at the very last of the suspend
instead of the pipe-disable function, so that we can catch all pending
URBs (if any).

While we're at it, drop the error code from udl_sync_pending_urb()
since we basically ignore it; instead, give a clear error message
indicating a problem.

Signed-off-by: Takashi Iwai <tiwai@...e.de>
---
 drivers/gpu/drm/udl/udl_drv.c     | 8 +++++++-
 drivers/gpu/drm/udl/udl_drv.h     | 2 +-
 drivers/gpu/drm/udl/udl_main.c    | 6 ++----
 drivers/gpu/drm/udl/udl_modeset.c | 2 --
 4 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/udl/udl_drv.c b/drivers/gpu/drm/udl/udl_drv.c
index 0ba88e5472a9..91effdcefb6d 100644
--- a/drivers/gpu/drm/udl/udl_drv.c
+++ b/drivers/gpu/drm/udl/udl_drv.c
@@ -21,8 +21,14 @@ static int udl_usb_suspend(struct usb_interface *interface,
 			   pm_message_t message)
 {
 	struct drm_device *dev = usb_get_intfdata(interface);
+	int ret;
 
-	return drm_mode_config_helper_suspend(dev);
+	ret = drm_mode_config_helper_suspend(dev);
+	if (ret)
+		return ret;
+
+	udl_sync_pending_urbs(dev);
+	return 0;
 }
 
 static int udl_usb_resume(struct usb_interface *interface)
diff --git a/drivers/gpu/drm/udl/udl_drv.h b/drivers/gpu/drm/udl/udl_drv.h
index d943684b5bbb..b4cc7cc568c7 100644
--- a/drivers/gpu/drm/udl/udl_drv.h
+++ b/drivers/gpu/drm/udl/udl_drv.h
@@ -77,7 +77,7 @@ struct drm_connector *udl_connector_init(struct drm_device *dev);
 struct urb *udl_get_urb(struct drm_device *dev);
 
 int udl_submit_urb(struct drm_device *dev, struct urb *urb, size_t len);
-int udl_sync_pending_urbs(struct drm_device *dev);
+void udl_sync_pending_urbs(struct drm_device *dev);
 void udl_urb_completion(struct urb *urb);
 
 int udl_init(struct udl_device *udl);
diff --git a/drivers/gpu/drm/udl/udl_main.c b/drivers/gpu/drm/udl/udl_main.c
index 808a5ab5e14e..442080fa1061 100644
--- a/drivers/gpu/drm/udl/udl_main.c
+++ b/drivers/gpu/drm/udl/udl_main.c
@@ -290,10 +290,9 @@ int udl_submit_urb(struct drm_device *dev, struct urb *urb, size_t len)
 }
 
 /* wait until all pending URBs have been processed */
-int udl_sync_pending_urbs(struct drm_device *dev)
+void udl_sync_pending_urbs(struct drm_device *dev)
 {
 	struct udl_device *udl = to_udl(dev);
-	int ret = 0;
 
 	spin_lock_irq(&udl->urbs.lock);
 	/* 2 seconds as a sane timeout */
@@ -301,9 +300,8 @@ int udl_sync_pending_urbs(struct drm_device *dev)
 					 udl->urbs.available == udl->urbs.count,
 					 udl->urbs.lock,
 					 msecs_to_jiffies(2000)))
-		ret = -ETIMEDOUT;
+		drm_err(dev, "Timeout for syncing pending URBs\n");
 	spin_unlock_irq(&udl->urbs.lock);
-	return ret;
 }
 
 int udl_init(struct udl_device *udl)
diff --git a/drivers/gpu/drm/udl/udl_modeset.c b/drivers/gpu/drm/udl/udl_modeset.c
index 9896c16c74f5..c506fff8f0c4 100644
--- a/drivers/gpu/drm/udl/udl_modeset.c
+++ b/drivers/gpu/drm/udl/udl_modeset.c
@@ -383,8 +383,6 @@ udl_simple_display_pipe_disable(struct drm_simple_display_pipe *pipe)
 	buf = udl_dummy_render(buf);
 
 	udl_submit_urb(dev, urb, buf - (char *)urb->transfer_buffer);
-
-	udl_sync_pending_urbs(dev);
 }
 
 static void
-- 
2.35.3