android/android_bootable_recovery
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delay accessing misc partition until its device exists

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When the misc partition is on an emmc device, recovery can get started
and try to access it before the kernel has actually created the
device.  Try statting the device before reading or writing it; delay
up to 10 seconds waiting for the device to exist.

Change-Id: I93256db4b047c76020490e8a3dc76b8ade643291
This commit is contained in:
Doug Zongker 2011-04-22 09:26:44 -07:00 committed by Mike Lockwood
parent 4762633cf8
commit 90588820b7
1 changed files with 21 additions and 0 deletions
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21
bootloader.c
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@ -22,6 +22,8 @@
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
static int get_bootloader_message_mtd(struct bootloader_message *out, const Volume* v);
static int set_bootloader_message_mtd(const struct bootloader_message *in, const Volume* v);
@ -132,8 +134,26 @@ static int set_bootloader_message_mtd(const struct bootloader_message *in,
// for misc partitions on block devices
// ------------------------------------
static void wait_for_device(const char* fn) {
int tries = 0;
int ret;
struct stat buf;
do {
++tries;
ret = stat(fn, &buf);
if (ret) {
printf("stat %s try %d: %s\n", fn, tries, strerror(errno));
sleep(1);
}
} while (ret && tries < 10);
if (ret) {
printf("failed to stat %s\n", fn);
}
}
static int get_bootloader_message_block(struct bootloader_message *out,
const Volume* v) {
wait_for_device(v->device);
FILE* f = fopen(v->device, "rb");
if (f == NULL) {
LOGE("Can't open %s\n(%s)\n", v->device, strerror(errno));
@ -155,6 +175,7 @@ static int get_bootloader_message_block(struct bootloader_message *out,
static int set_bootloader_message_block(const struct bootloader_message *in,
const Volume* v) {
wait_for_device(v->device);
FILE* f = fopen(v->device, "wb");
if (f == NULL) {
LOGE("Can't open %s\n(%s)\n", v->device, strerror(errno));