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path: root/drivers/mtd/devices/block2mtd.c
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Diffstat (limited to 'drivers/mtd/devices/block2mtd.c')
-rw-r--r--drivers/mtd/devices/block2mtd.c58
1 files changed, 43 insertions, 15 deletions
diff --git a/drivers/mtd/devices/block2mtd.c b/drivers/mtd/devices/block2mtd.c
index 66f0405f7e53..b16f3cda97ff 100644
--- a/drivers/mtd/devices/block2mtd.c
+++ b/drivers/mtd/devices/block2mtd.c
@@ -9,7 +9,15 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+/*
+ * When the first attempt at device initialization fails, we may need to
+ * wait a little bit and retry. This timeout, by default 3 seconds, gives
+ * device time to start up. Required on BCM2708 and a few other chipsets.
+ */
+#define MTD_DEFAULT_TIMEOUT 3
+
#include <linux/module.h>
+#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/blkdev.h>
#include <linux/bio.h>
@@ -209,10 +217,14 @@ static void block2mtd_free_device(struct block2mtd_dev *dev)
}
-static struct block2mtd_dev *add_device(char *devname, int erase_size)
+static struct block2mtd_dev *add_device(char *devname, int erase_size,
+ int timeout)
{
+#ifndef MODULE
+ int i;
+#endif
const fmode_t mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
- struct block_device *bdev;
+ struct block_device *bdev = ERR_PTR(-ENODEV);
struct block2mtd_dev *dev;
char *name;
@@ -225,15 +237,28 @@ static struct block2mtd_dev *add_device(char *devname, int erase_size)
/* Get a handle on the device */
bdev = blkdev_get_by_path(devname, mode, dev);
-#ifndef MODULE
- if (IS_ERR(bdev)) {
-
- /* We might not have rootfs mounted at this point. Try
- to resolve the device name by other means. */
- dev_t devt = name_to_dev_t(devname);
- if (devt)
- bdev = blkdev_get_by_dev(devt, mode, dev);
+#ifndef MODULE
+ /*
+ * We might not have the root device mounted at this point.
+ * Try to resolve the device name by other means.
+ */
+ for (i = 0; IS_ERR(bdev) && i <= timeout; i++) {
+ dev_t devt;
+
+ if (i)
+ /*
+ * Calling wait_for_device_probe in the first loop
+ * was not enough, sleep for a bit in subsequent
+ * go-arounds.
+ */
+ msleep(1000);
+ wait_for_device_probe();
+
+ devt = name_to_dev_t(devname);
+ if (!devt)
+ continue;
+ bdev = blkdev_get_by_dev(devt, mode, dev);
}
#endif
@@ -280,6 +305,7 @@ static struct block2mtd_dev *add_device(char *devname, int erase_size)
/* Device didn't get added, so free the entry */
goto err_destroy_mutex;
}
+
list_add(&dev->list, &blkmtd_device_list);
pr_info("mtd%d: [%s] erase_size = %dKiB [%d]\n",
dev->mtd.index,
@@ -348,16 +374,19 @@ static inline void kill_final_newline(char *str)
#ifndef MODULE
static int block2mtd_init_called = 0;
-static char block2mtd_paramline[80 + 12]; /* 80 for device, 12 for erase size */
+/* 80 for device, 12 for erase size */
+static char block2mtd_paramline[80 + 12];
#endif
static int block2mtd_setup2(const char *val)
{
- char buf[80 + 12]; /* 80 for device, 12 for erase size */
+ /* 80 for device, 12 for erase size, 80 for name, 8 for timeout */
+ char buf[80 + 12 + 80 + 8];
char *str = buf;
char *token[2];
char *name;
size_t erase_size = PAGE_SIZE;
+ unsigned long timeout = MTD_DEFAULT_TIMEOUT;
int i, ret;
if (strnlen(val, sizeof(buf)) >= sizeof(buf)) {
@@ -395,7 +424,7 @@ static int block2mtd_setup2(const char *val)
}
}
- add_device(name, erase_size);
+ add_device(name, erase_size, timeout);
return 0;
}
@@ -463,8 +492,7 @@ static void block2mtd_exit(void)
}
}
-
-module_init(block2mtd_init);
+late_initcall(block2mtd_init);
module_exit(block2mtd_exit);
MODULE_LICENSE("GPL");