linux-kernel - [GIT PULL 1/3] intel_th: Fix a double put

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Date:   Wed, 20 Nov 2019 15:08:04 +0200
From:   Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Wen Yang <wenyang@...ux.alibaba.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        stable@...r.kernel.org
Subject: [GIT PULL 1/3] intel_th: Fix a double put_device() in error path

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@...ux.intel.com>
Fixes: a753bfcfdb1f ("intel_th: Make the switch allocate its subdevices")
Reported-by: Wen Yang <wenyang@...ux.alibaba.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: stable@...r.kernel.org # v4.14+
---
 drivers/hwtracing/intel_th/core.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/hwtracing/intel_th/core.c b/drivers/hwtracing/intel_th/core.c
index d5c1821b31c6..0dfd97bbde9e 100644
--- a/drivers/hwtracing/intel_th/core.c
+++ b/drivers/hwtracing/intel_th/core.c
@@ -649,10 +649,8 @@ intel_th_subdevice_alloc(struct intel_th *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) {
 		if (subdev->mknode)
@@ -667,10 +665,8 @@ intel_th_subdevice_alloc(struct intel_th *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) {
-- 
2.24.0