[PATCH v4 3/5] IMA: Refactor do_get_kexec_buffer() to call of_ functions directly

Lakshmi Ramasubramanian
2020-08-19T17:21:54Z

do_get_kexec_buffer() calls another local function get_addr_size_cells()
to get the address and size of the IMA measurement log buffer stored in
the device tree. get_addr_size_cells() is small enough that it can be
merged into do_get_kexec_buffer() and a function call can be avoided.

Refactor do_get_kexec_buffer() to call of_ functions directly instead
of calling get_addr_size_cells() and remove get_addr_size_cells().

Co-developed-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
---
security/integrity/ima/ima_kexec.c | 20 +++++---------------
1 file changed, 5 insertions(+), 15 deletions(-)

diff --git a/security/integrity/ima/ima_kexec.c b/security/integrity/ima/ima_kexec.c
index 25d79d521597..283631098b48 100644
--- a/security/integrity/ima/ima_kexec.c
+++ b/security/integrity/ima/ima_kexec.c
@@ -15,31 +15,21 @@
#include <linux/libfdt.h>
#include "ima.h"

-static int get_addr_size_cells(int *addr_cells, int *size_cells)
+static int do_get_kexec_buffer(const void *prop, int len, unsigned long *addr,
+ size_t *size)
{
+ int addr_cells, size_cells;
struct device_node *root;

root = of_find_node_by_path("/");
if (!root)
return -EINVAL;

- *addr_cells = of_n_addr_cells(root);
- *size_cells = of_n_size_cells(root);
+ addr_cells = of_n_addr_cells(root);
+ size_cells = of_n_size_cells(root);

of_node_put(root);

- return 0;
-}
-
-static int do_get_kexec_buffer(const void *prop, int len, unsigned long *addr,
- size_t *size)
-{
- int ret, addr_cells, size_cells;
-
- ret = get_addr_size_cells(&addr_cells, &size_cells);
- if (ret)
- return ret;
-
if (len < 4 * (addr_cells + size_cells))
return -ENOENT;

--
2.28.0