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Merge "drivers: rename_block: Enable A/B support"

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qctecmdr 2021-05-11 01:42:47 -07:00 • committed by Gerrit - the friendly Code Review server
commit b9ca7556ae
1 changed files with 38 additions and 3 deletions
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41
drivers/soc/qcom/rename_block_device.c
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@ -10,6 +10,39 @@
#include <linux/device.h>
#include <linux/of.h>
#define PATH_SIZE 32
#define SLOT_STR_LENGTH 3
#define MAX_STR_SIZE 255
static char active_slot[SLOT_STR_LENGTH];
static char backup_slot[SLOT_STR_LENGTH];
static int dp_enabled;
static char final_name[MAX_STR_SIZE];
static int __init set_slot_suffix(char *str)
{
if (str) {
strlcpy(active_slot, str, SLOT_STR_LENGTH);
strcmp(active_slot, "_a") ?
strlcpy(backup_slot, "_a", SLOT_STR_LENGTH) :
strlcpy(backup_slot, "_b", SLOT_STR_LENGTH);
dp_enabled = 1;
}
return 1;
}
__setup("androidboot.slot_suffix=", set_slot_suffix);
static void get_slot_updated_name(char *name)
{
int length = strlen(name);
memset(final_name, '\0', MAX_STR_SIZE);
strlcpy(final_name, name, MAX_STR_SIZE);
if (dp_enabled && (final_name[length-2] == '_')) {
if (final_name[length-1] == 'a')
final_name[length-1] = active_slot[1];
else if (final_name[length-1] == 'b')
final_name[length-1] = backup_slot[1];
}
}
static int rename_blk_dev_init(void)
{
@ -18,7 +51,8 @@ static int rename_blk_dev_init(void)
struct gendisk *disk;
struct device_node *node;
char dev_path[PATH_SIZE];
const char *actual_name, *modified_name;
const char *actual_name;
char *modified_name;
node = of_find_compatible_node(NULL, NULL, "qcom,blkdev-rename");
if (!node) {
@ -40,8 +74,9 @@ static int rename_blk_dev_init(void)
return -ENXIO;
}
if (!of_property_read_string_index(node, "rename-dev", index,
&modified_name)) {
device_rename(disk_to_dev(disk), modified_name);
(const char **)&modified_name)) {
get_slot_updated_name(modified_name);
device_rename(disk_to_dev(disk), final_name);
} else {
pr_err("rename-dev for actual-dev = %s is missing\n",
actual_name);