Merge tag 'misc-habanalabs-fixes-2020-11-30' of...

Merge tag 'misc-habanalabs-fixes-2020-11-30' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/ogabbay/linux into char-misc-linus

Oded writes:

This tag contains two bug fixes for v5.10-rc7:

- Memory leak every time a user closes the file-descriptor of the device.
  The driver didn't always free all the VA range structures it maintains
  per user.

- Memory leak every time the driver was removed. The device structure was
  not "put" at the device's teardown function in the driver.

* tag 'misc-habanalabs-fixes-2020-11-30' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/ogabbay/linux:
  habanalabs: put devices before driver removal
  habanalabs: free host huge va_range if not used

drivers/misc/habanalabs/common/device.c

@@ -231,16 +231,16 @@ static int device_cdev_sysfs_add(struct hl_device *hdev)
 
 static void device_cdev_sysfs_del(struct hl_device *hdev)
 {
-	/* device_release() won't be called so must free devices explicitly */
-	if (!hdev->cdev_sysfs_created) {
-		kfree(hdev->dev_ctrl);
-		kfree(hdev->dev);
-		return;
-	}
+	if (!hdev->cdev_sysfs_created)
+		goto put_devices;
 
 	hl_sysfs_fini(hdev);
 	cdev_device_del(&hdev->cdev_ctrl, hdev->dev_ctrl);
 	cdev_device_del(&hdev->cdev, hdev->dev);
+
+put_devices:
+	put_device(hdev->dev);
+	put_device(hdev->dev_ctrl);
 }
 
 /*
@@ -1371,9 +1371,9 @@ int hl_device_init(struct hl_device *hdev, struct class *hclass)
 early_fini:
 	device_early_fini(hdev);
 free_dev_ctrl:
-	kfree(hdev->dev_ctrl);
+	put_device(hdev->dev_ctrl);
 free_dev:
-	kfree(hdev->dev);
+	put_device(hdev->dev);
 out_disabled:
 	hdev->disabled = true;
 	if (add_cdev_sysfs_on_err)

drivers/misc/habanalabs/common/memory.c

@@ -1626,6 +1626,7 @@ static int vm_ctx_init_with_ranges(struct hl_ctx *ctx,
 			goto host_hpage_range_err;
 		}
 	} else {
+		kfree(ctx->host_huge_va_range);
 		ctx->host_huge_va_range = ctx->host_va_range;
 	}