commit 6403587a930c ("coresight: use put_device() instead of kfree()") fixes the double freeing of resources and ensures that the device refcount is dropped properly. Add a comment to explain this to help the readers and prevent people trying to "unfix" it again.
While at it, rename the labels for better readability.
Cc: Mathieu Poirier mathieu.poirier@linaro.org Cc: Arvind Yadav arvind.yadav.cs@gmail.com Signed-off-by: Suzuki K Poulose suzuki.poulose@arm.com --- Change since v1: - Document the error handling than trying to "unfix" the problem. --- drivers/hwtracing/coresight/coresight.c | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-)
diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c index 3e07fd3..9fd0c38 100644 --- a/drivers/hwtracing/coresight/coresight.c +++ b/drivers/hwtracing/coresight/coresight.c @@ -1006,7 +1006,7 @@ struct coresight_device *coresight_register(struct coresight_desc *desc) csdev = kzalloc(sizeof(*csdev), GFP_KERNEL); if (!csdev) { ret = -ENOMEM; - goto err_kzalloc_csdev; + goto err_out; }
if (desc->type == CORESIGHT_DEV_TYPE_LINK || @@ -1022,7 +1022,7 @@ struct coresight_device *coresight_register(struct coresight_desc *desc) refcnts = kcalloc(nr_refcnts, sizeof(*refcnts), GFP_KERNEL); if (!refcnts) { ret = -ENOMEM; - goto err_kzalloc_refcnts; + goto err_free_csdev; }
csdev->refcnt = refcnts; @@ -1035,7 +1035,7 @@ struct coresight_device *coresight_register(struct coresight_desc *desc) conns = kcalloc(csdev->nr_outport, sizeof(*conns), GFP_KERNEL); if (!conns) { ret = -ENOMEM; - goto err_kzalloc_conns; + goto err_free_refcnts; }
for (i = 0; i < csdev->nr_outport; i++) { @@ -1062,7 +1062,11 @@ struct coresight_device *coresight_register(struct coresight_desc *desc) ret = device_register(&csdev->dev); if (ret) { put_device(&csdev->dev); - goto err_kzalloc_csdev; + /* + * All resources are free'd explicitly via + * coresight_device_release(), triggered from put_device(). + */ + goto err_out; }
mutex_lock(&coresight_mutex); @@ -1074,11 +1078,11 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
return csdev;
-err_kzalloc_conns: +err_free_refcnts: kfree(refcnts); -err_kzalloc_refcnts: +err_free_csdev: kfree(csdev); -err_kzalloc_csdev: +err_out: return ERR_PTR(ret); } EXPORT_SYMBOL_GPL(coresight_register);