mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-14 06:35:12 +00:00
67c3e59443
The call to of_find_compatible_node() returns a node pointer with
refcount incremented thus it must be explicitly decremented here
before returning.
Fixes: a489043f46 ("powerpc/pseries: Implement arch_get_random_long() based on H_RANDOM")
Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1530522496-14816-1-git-send-email-hofrat@osadl.org
42 lines
802 B
C
42 lines
802 B
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Copyright 2013, Michael Ellerman, IBM Corporation.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "pseries-rng: " fmt
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/of.h>
|
|
#include <asm/archrandom.h>
|
|
#include <asm/machdep.h>
|
|
#include <asm/plpar_wrappers.h>
|
|
|
|
|
|
static int pseries_get_random_long(unsigned long *v)
|
|
{
|
|
unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
|
|
|
|
if (plpar_hcall(H_RANDOM, retbuf) == H_SUCCESS) {
|
|
*v = retbuf[0];
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static __init int rng_init(void)
|
|
{
|
|
struct device_node *dn;
|
|
|
|
dn = of_find_compatible_node(NULL, NULL, "ibm,random");
|
|
if (!dn)
|
|
return -ENODEV;
|
|
|
|
pr_info("Registering arch random hook.\n");
|
|
|
|
ppc_md.get_random_seed = pseries_get_random_long;
|
|
|
|
of_node_put(dn);
|
|
return 0;
|
|
}
|
|
machine_subsys_initcall(pseries, rng_init);
|