remoteproc: use a local copy for the name field

The current name field used in the remoteproc structure is simply
a pointer to a name field supplied during the rproc_alloc() call.
The pointer passed in by remoteproc drivers during registration is
typically a dev_name pointer, but it is possible that the pointer
will no longer remain valid if the devices themselves were created
at runtime like in the case of of_platform_populate(), and were
deleted upon any failures within the respective remoteproc driver
probe function.

So, allocate and maintain a local copy for this name field to
keep it agnostic of the logic used in the remoteproc drivers.

Signed-off-by: Suman Anna <s-anna@ti.com>

drivers/remoteproc/remoteproc_core.c

@@ -1689,6 +1689,7 @@ static void rproc_type_release(struct device *dev)
 
 	kfree(rproc->firmware);
 	kfree(rproc->ops);
+	kfree(rproc->name);
 	kfree(rproc);
 }
 
@@ -1761,7 +1762,13 @@ struct rproc *rproc_alloc(struct device *dev, const char *name,
 	}
 
 	rproc->firmware = p;
-	rproc->name = name;
+	rproc->name = kstrdup(name, GFP_KERNEL);
+	if (!rproc->name) {
+		kfree(p);
+		kfree(rproc->ops);
+		kfree(rproc);
+		return NULL;
+	}
 	rproc->priv = &rproc[1];
 	rproc->auto_boot = true;
 

include/linux/remoteproc.h

@@ -495,7 +495,7 @@ struct rproc_dump_segment {
 struct rproc {
 	struct list_head node;
 	struct iommu_domain *domain;
-	const char *name;
+	char *name;
 	char *firmware;
 	void *priv;
 	struct rproc_ops *ops;