arm/xen: Fix some refcount leaks

The of_find_compatible_node() function returns a node pointer with
refcount incremented, We should use of_node_put() on it when done
Add the missing of_node_put() to release the refcount.

Fixes: 9b08aaa3199a ("ARM: XEN: Move xen_early_init() before efi_init()")
Fixes: b2371587fe0c ("arm/xen: Read extended regions from DT and init Xen resource")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Signed-off-by: Stefano Stabellini <stefano.stabellini@xilinx.com>

diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index ec5b082f3de6e35914ab6a73fe8e292fa6c08f7e..07eb69f9e7df3d2cbf77719f0c3df62f232ceac7 100644 (file)
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -337,12 +337,15 @@ int __init arch_xen_unpopulated_init(struct resource **res)
 
        if (!nr_reg) {
                pr_err("No extended regions are found\n");
+               of_node_put(np);
                return -EINVAL;
        }
 
        regs = kcalloc(nr_reg, sizeof(*regs), GFP_KERNEL);
-       if (!regs)
+       if (!regs) {
+               of_node_put(np);
                return -ENOMEM;
+       }
 
        /*
         * Create resource from extended regions provided by the hypervisor to be
@@ -403,8 +406,8 @@ int __init arch_xen_unpopulated_init(struct resource **res)
        *res = &xen_resource;
 
 err:
+       of_node_put(np);
        kfree(regs);
-
        return rc;
 }
 #endif
@@ -424,8 +427,10 @@ static void __init xen_dt_guest_init(void)
 
        if (of_address_to_resource(xen_node, GRANT_TABLE_INDEX, &res)) {
                pr_err("Xen grant table region is not found\n");
+               of_node_put(xen_node);
                return;
        }
+       of_node_put(xen_node);
        xen_grant_frames = res.start;
 }