media: mgb4: Fix debugfs error handling

Fix broken handling of debugfs_create_dir() errors including errors
creating the parent mgb4(PCIe) device's debugfs directory.

Signed-off-by: Martin Tůma <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>

drivers/media/pci/mgb4/mgb4_core.c

···
 							    NULL);
 #endif
 
-#ifdef CONFIG_DEBUG_FS
 	mgbdev->debugfs = debugfs_create_dir(dev_name(&pdev->dev), NULL);
-#endif
 
 	/* Get card serial number. On systems without MTD flash support we may
 	 * get an error thus ignore the return value. An invalid serial number
···
 	hwmon_device_unregister(mgbdev->hwmon_dev);
 #endif
 
+	debugfs_remove_recursive(mgbdev->debugfs);
+
 	if (mgbdev->indio_dev)
 		mgb4_trigger_free(mgbdev->indio_dev);
 
···
 	for (i = 0; i < MGB4_VIN_DEVICES; i++)
 		if (mgbdev->vin[i])
 			mgb4_vin_free(mgbdev->vin[i]);
-
-#ifdef CONFIG_DEBUG_FS
-	debugfs_remove_recursive(mgbdev->debugfs);
-#endif
 
 	device_remove_groups(&mgbdev->pdev->dev, mgb4_pci_groups);
 	free_spi(mgbdev);

drivers/media/pci/mgb4/mgb4_core.h

···
 	u8 module_version;
 	u32 serial_number;
 
-#ifdef CONFIG_DEBUG_FS
 	struct dentry *debugfs;
-#endif
 };
 
 #endif

drivers/media/pci/mgb4/mgb4_vin.c

···
 	mgb4_write_reg(video, regs->config, 1U << 9);
 }
 
-#ifdef CONFIG_DEBUG_FS
-static void debugfs_init(struct mgb4_vin_dev *vindev)
+static void create_debugfs(struct mgb4_vin_dev *vindev)
 {
+#ifdef CONFIG_DEBUG_FS
 	struct mgb4_regs *video = &vindev->mgbdev->video;
+	struct dentry *entry;
 
-	vindev->debugfs = debugfs_create_dir(vindev->vdev.name,
-					     vindev->mgbdev->debugfs);
-	if (!vindev->debugfs)
+	if (IS_ERR_OR_NULL(vindev->mgbdev->debugfs))
+		return;
+	entry = debugfs_create_dir(vindev->vdev.name, vindev->mgbdev->debugfs);
+	if (IS_ERR(entry))
 		return;
 
 	vindev->regs[0].name = "CONFIG";
···
 	vindev->regset.base = video->membase;
 	vindev->regset.regs = vindev->regs;
 
-	debugfs_create_regset32("registers", 0444, vindev->debugfs,
-				&vindev->regset);
-}
+	debugfs_create_regset32("registers", 0444, entry, &vindev->regset);
 #endif
+}
 
 struct mgb4_vin_dev *mgb4_vin_create(struct mgb4_dev *mgbdev, int id)
 {
···
 		goto err_video_dev;
 	}
 
-#ifdef CONFIG_DEBUG_FS
-	debugfs_init(vindev);
-#endif
+	create_debugfs(vindev);
 
 	return vindev;
 
···
 
 	free_irq(vin_irq, vindev);
 	free_irq(err_irq, vindev);
-
-#ifdef CONFIG_DEBUG_FS
-	debugfs_remove_recursive(vindev->debugfs);
-#endif
 
 	groups = MGB4_IS_GMSL(vindev->mgbdev)
 	  ? mgb4_gmsl_in_groups : mgb4_fpdl3_in_groups;

drivers/media/pci/mgb4/mgb4_vin.h

···
 	const struct mgb4_vin_config *config;
 
 #ifdef CONFIG_DEBUG_FS
-	struct dentry *debugfs;
 	struct debugfs_regset32 regset;
 	struct debugfs_reg32 regs[sizeof(struct mgb4_vin_regs) / 4];
 #endif

drivers/media/pci/mgb4/mgb4_vout.c

···
 		       (voutdev->config->id + MGB4_VIN_DEVICES) << 2 | 1 << 4);
 }
 
-#ifdef CONFIG_DEBUG_FS
-static void debugfs_init(struct mgb4_vout_dev *voutdev)
+static void create_debugfs(struct mgb4_vout_dev *voutdev)
 {
+#ifdef CONFIG_DEBUG_FS
 	struct mgb4_regs *video = &voutdev->mgbdev->video;
+	struct dentry *entry;
 
-	voutdev->debugfs = debugfs_create_dir(voutdev->vdev.name,
-					      voutdev->mgbdev->debugfs);
-	if (!voutdev->debugfs)
+	if (IS_ERR_OR_NULL(voutdev->mgbdev->debugfs))
+		return;
+	entry = debugfs_create_dir(voutdev->vdev.name, voutdev->mgbdev->debugfs);
+	if (IS_ERR(entry))
 		return;
 
 	voutdev->regs[0].name = "CONFIG";
···
 	voutdev->regset.base = video->membase;
 	voutdev->regset.regs = voutdev->regs;
 
-	debugfs_create_regset32("registers", 0444, voutdev->debugfs,
-				&voutdev->regset);
-}
+	debugfs_create_regset32("registers", 0444, entry, &voutdev->regset);
 #endif
+}
 
 struct mgb4_vout_dev *mgb4_vout_create(struct mgb4_dev *mgbdev, int id)
 {
···
 		goto err_video_dev;
 	}
 
-#ifdef CONFIG_DEBUG_FS
-	debugfs_init(voutdev);
-#endif
+	create_debugfs(voutdev);
 
 	return voutdev;
 
···
 	int irq = xdma_get_user_irq(voutdev->mgbdev->xdev, voutdev->config->irq);
 
 	free_irq(irq, voutdev);
-
-#ifdef CONFIG_DEBUG_FS
-	debugfs_remove_recursive(voutdev->debugfs);
-#endif
 
 	groups = MGB4_IS_GMSL(voutdev->mgbdev)
 	  ? mgb4_gmsl_out_groups : mgb4_fpdl3_out_groups;

drivers/media/pci/mgb4/mgb4_vout.h

···
 	const struct mgb4_vout_config *config;
 
 #ifdef CONFIG_DEBUG_FS
-	struct dentry *debugfs;
 	struct debugfs_regset32 regset;
 	struct debugfs_reg32 regs[sizeof(struct mgb4_vout_regs) / 4];
 #endif