[PATCH 4.19 068/140] intel_th: Fix a double put_device() in error path

[Greg Kroah-Hartman]

From: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>

commit 512592779a337feb5905d8fcf9498dbf33672d4a upstream.

Commit a753bfcfdb1f ("intel_th: Make the switch allocate its subdevices")
factored out intel_th_subdevice_alloc() from intel_th_populate(), but got
the error path wrong, resulting in two instances of a double put_device()
on a freshly initialized, but not 'added' device.

Fix this by only doing one put_device() in the error path.

Signed-off-by: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Fixes: a753bfcfdb1f ("intel_th: Make the switch allocate its subdevices")
Reported-by: Wen Yang <wenyang@xxxxxxxxxxxxxxxxx>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # v4.14+
Link: https://lore.kernel.org/r/20191120130806.44028-2-alexander.shishkin@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/hwtracing/intel_th/core.c |    8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

--- a/drivers/hwtracing/intel_th/core.c
+++ b/drivers/hwtracing/intel_th/core.c
@@ -629,10 +629,8 @@ intel_th_subdevice_alloc(struct intel_th
 	}
 
 	err = intel_th_device_add_resources(thdev, res, subdev->nres);
-	if (err) {
-		put_device(&thdev->dev);
+	if (err)
 		goto fail_put_device;
-	}
 
 	if (subdev->type == INTEL_TH_OUTPUT) {
 		thdev->dev.devt = MKDEV(th->major, th->num_thdevs);
@@ -646,10 +644,8 @@ intel_th_subdevice_alloc(struct intel_th
 	}
 
 	err = device_add(&thdev->dev);
-	if (err) {
-		put_device(&thdev->dev);
+	if (err)
 		goto fail_free_res;
-	}
 
 	/* need switch driver to be loaded to enumerate the rest */
 	if (subdev->type == INTEL_TH_SWITCH && !req) {