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authorFelix Fietkau <nbd@openwrt.org>2014-04-10 14:43:17 +0000
committerFelix Fietkau <nbd@openwrt.org>2014-04-10 14:43:17 +0000
commitf02e3a2a4a656aa550ad37e3c547a309872a011d (patch)
tree1e45c4ef87082267df7f56dd6d6ff3fa97144dd5 /target/linux/generic/patches-3.14/441-block2mtd_probe.patch
parent8a7a02bd2e98f807ebf8d0c0deb63fab04d055cc (diff)
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x86: try harder to attach block2mtd to fix boot issues on devices with longer delays
Signed-off-by: Felix Fietkau <nbd@openwrt.org> SVN-Revision: 40444
Diffstat (limited to 'target/linux/generic/patches-3.14/441-block2mtd_probe.patch')
-rw-r--r--target/linux/generic/patches-3.14/441-block2mtd_probe.patch110
1 files changed, 104 insertions, 6 deletions
diff --git a/target/linux/generic/patches-3.14/441-block2mtd_probe.patch b/target/linux/generic/patches-3.14/441-block2mtd_probe.patch
index 0b2e80c..3ab9d1a 100644
--- a/target/linux/generic/patches-3.14/441-block2mtd_probe.patch
+++ b/target/linux/generic/patches-3.14/441-block2mtd_probe.patch
@@ -1,10 +1,108 @@
--- a/drivers/mtd/devices/block2mtd.c
+++ b/drivers/mtd/devices/block2mtd.c
-@@ -234,6 +234,7 @@ static struct block2mtd_dev *add_device(
- /* We might not have rootfs mounted at this point. Try
- to resolve the device name by other means. */
+@@ -10,6 +10,7 @@
+ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+ #include <linux/module.h>
++#include <linux/delay.h>
+ #include <linux/fs.h>
+ #include <linux/blkdev.h>
+ #include <linux/bio.h>
+@@ -211,13 +212,14 @@ static void block2mtd_free_device(struct
+
+
+ /* FIXME: ensure that mtd->size % erase_size == 0 */
+-static struct block2mtd_dev *add_device(char *devname, int erase_size, const char *mtdname)
++static struct block2mtd_dev *add_device(char *devname, int erase_size, const char *mtdname, int timeout)
+ {
+ 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;
+ struct mtd_partition *part;
+ char *name;
++ int i;
+
+ if (!devname)
+ return NULL;
+@@ -228,15 +230,20 @@ static struct block2mtd_dev *add_device(
+
+ /* Get a handle on the device */
+ bdev = blkdev_get_by_path(devname, mode, dev);
++
+ #ifndef MODULE
+- if (IS_ERR(bdev)) {
++ for (i = 0; IS_ERR(bdev) && i <= timeout; i++) {
++ dev_t devt;
+
+- /* We might not have rootfs mounted at this point. Try
+- to resolve the device name by other means. */
++ if (i)
++ msleep(1000);
+ wait_for_device_probe();
- dev_t devt = name_to_dev_t(devname);
- if (devt)
- bdev = blkdev_get_by_dev(devt, mode, dev);
++
++ devt = name_to_dev_t(devname);
++ if (!devt)
++ continue;
+
+- dev_t devt = name_to_dev_t(devname);
+- if (devt)
+- bdev = blkdev_get_by_dev(devt, mode, dev);
++ bdev = blkdev_get_by_dev(devt, mode, dev);
+ }
+ #endif
+
+@@ -355,11 +362,12 @@ static char block2mtd_paramline[80 + 12]
+
+ static int block2mtd_setup2(const char *val)
+ {
+- char buf[80 + 12 + 80]; /* 80 for device, 12 for erase size, 80 for name */
++ char buf[80 + 12 + 80 + 8]; /* 80 for device, 12 for erase size, 80 for name, 8 for timeout */
+ char *str = buf;
+- char *token[3];
++ char *token[4];
+ char *name;
+ size_t erase_size = PAGE_SIZE;
++ unsigned long timeout = 0;
+ int i, ret;
+
+ if (strnlen(val, sizeof(buf)) >= sizeof(buf)) {
+@@ -370,7 +378,7 @@ static int block2mtd_setup2(const char *
+ strcpy(str, val);
+ kill_final_newline(str);
+
+- for (i = 0; i < 3; i++)
++ for (i = 0; i < 4; i++)
+ token[i] = strsep(&str, ",");
+
+ if (str) {
+@@ -399,7 +407,10 @@ static int block2mtd_setup2(const char *
+ if (token[2] && (strlen(token[2]) + 1 > 80))
+ pr_err("mtd device name too long\n");
+
+- add_device(name, erase_size, token[2]);
++ if (token[3] && kstrtoul(token[3], 0, &timeout))
++ pr_err("invalid timeout\n");
++
++ add_device(name, erase_size, token[2], timeout);
+
+ return 0;
+ }
+@@ -433,7 +444,7 @@ static int block2mtd_setup(const char *v
+
+
+ module_param_call(block2mtd, block2mtd_setup, NULL, NULL, 0200);
+-MODULE_PARM_DESC(block2mtd, "Device to use. \"block2mtd=<dev>[,<erasesize>[,<name>]]\"");
++MODULE_PARM_DESC(block2mtd, "Device to use. \"block2mtd=<dev>[,<erasesize>[,<name>[,<timeout>]]]\"");
+
+ static int __init block2mtd_init(void)
+ {
+@@ -467,7 +478,7 @@ static void block2mtd_exit(void)
+ }
+
+
+-module_init(block2mtd_init);
++late_initcall(block2mtd_init);
+ module_exit(block2mtd_exit);
+
+ MODULE_LICENSE("GPL");