[PATCH 1/5] gpu: host1x: Call ->remove() only when a device is bound

[Thierry Reding <thierry.reding@gmail.com>]

From: Thierry Reding <treding@nvidia.com>

When a driver's ->probe() function fails, the host1x bus must not call
its ->remove() function because the driver will already have cleaned up
in the error handling path in ->probe().

Signed-off-by: Thierry Reding <treding@nvidia.com>
---
 drivers/gpu/host1x/bus.c | 9 +++++++--
 include/linux/host1x.h   | 2 ++
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/host1x/bus.c b/drivers/gpu/host1x/bus.c
index aaf54859adb0..e4182e68e29c 100644
--- a/drivers/gpu/host1x/bus.c
+++ b/drivers/gpu/host1x/bus.c
@@ -116,7 +116,10 @@ static void host1x_subdev_register(struct host1x_device *device,
 	if (list_empty(&device->subdevs)) {
 		err = device->driver->probe(device);
 		if (err < 0)
-			dev_err(&device->dev, "probe failed: %d\n", err);
+			dev_err(&device->dev, "probe failed for %ps: %d\n",
+				device->driver, err);
+		else
+			device->bound = true;
 	}
 }
 
@@ -130,10 +133,12 @@ static void __host1x_subdev_unregister(struct host1x_device *device,
 	 * If all subdevices have been activated, we're about to remove the
 	 * first active subdevice, so unload the driver first.
 	 */
-	if (list_empty(&device->subdevs)) {
+	if (list_empty(&device->subdevs) && device->bound) {
 		err = device->driver->remove(device);
 		if (err < 0)
 			dev_err(&device->dev, "remove failed: %d\n", err);
+
+		device->bound = false;
 	}
 
 	/*
diff --git a/include/linux/host1x.h b/include/linux/host1x.h
index bb9840fd1e18..7890b553d12e 100644
--- a/include/linux/host1x.h
+++ b/include/linux/host1x.h
@@ -272,6 +272,8 @@ struct host1x_device {
 
 	struct mutex clients_lock;
 	struct list_head clients;
+
+	bool bound;
 };
 
 static inline struct host1x_device *to_host1x_device(struct device *dev)
-- 
2.1.3

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