diff options
Diffstat (limited to 'target/linux/generic-2.6/patches/205-block2mtd_fix.patch')
| -rw-r--r-- | target/linux/generic-2.6/patches/205-block2mtd_fix.patch | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/target/linux/generic-2.6/patches/205-block2mtd_fix.patch b/target/linux/generic-2.6/patches/205-block2mtd_fix.patch new file mode 100644 index 0000000000..9aaffc59ef --- /dev/null +++ b/target/linux/generic-2.6/patches/205-block2mtd_fix.patch @@ -0,0 +1,235 @@ +diff -urN linux.old/drivers/mtd/devices/block2mtd.c linux.dev/drivers/mtd/devices/block2mtd.c +--- linux.old/drivers/mtd/devices/block2mtd.c 2006-07-29 19:53:54.000000000 +0200 ++++ linux.dev/drivers/mtd/devices/block2mtd.c 2006-07-29 19:47:03.000000000 +0200 +@@ -4,11 +4,10 @@ + * block2mtd.c - create an mtd from a block device + * + * Copyright (C) 2001,2002 Simon Evans <spse@secret.org.uk> +- * Copyright (C) 2004,2005 Jörn Engel <joern@wh.fh-wedel.de> ++ * Copyright (C) 2004-2006 Jörn Engel <joern@wh.fh-wedel.de> + * + * Licence: GPL + */ +-#include <linux/config.h> + #include <linux/module.h> + #include <linux/fs.h> + #include <linux/blkdev.h> +@@ -19,6 +18,7 @@ #include <linux/init.h> + #include <linux/mtd/mtd.h> + #include <linux/buffer_head.h> + #include <linux/mutex.h> ++#include <linux/mount.h> + + #define VERSION "$Revision: 1.30 $" + +@@ -62,10 +61,8 @@ + read_lock_irq(&mapping->tree_lock); + for (i = 0; i < PAGE_READAHEAD; i++) { + pagei = index + i; +- if (pagei > end_index) { +- INFO("Overrun end of disk in cache readahead\n"); ++ if (pagei > end_index) + break; +- } + page = radix_tree_lookup(&mapping->page_tree, pagei); + if (page && (!i)) + break; +@@ -237,6 +237,8 @@ static int _block2mtd_write(struct block + } + return 0; + } ++ ++ + static int block2mtd_write(struct mtd_info *mtd, loff_t to, size_t len, + size_t *retlen, const u_char *buf) + { +@@ -300,6 +302,19 @@ static struct block2mtd_dev *add_device( + + /* Get a handle on the device */ + bdev = open_bdev_excl(devname, O_RDWR, NULL); ++#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 dev = name_to_dev_t(devname); ++ if (dev != 0) { ++ bdev = open_by_devnum(dev, FMODE_WRITE | FMODE_READ); ++ } ++ } ++#endif ++ + if (IS_ERR(bdev)) { + ERROR("error: cannot open device %s", devname); + goto devinit_err; +@@ -331,7 +347,6 @@ static struct block2mtd_dev *add_device( + dev->mtd.writev = default_mtd_writev; + dev->mtd.sync = block2mtd_sync; + dev->mtd.read = block2mtd_read; +- dev->mtd.readv = default_mtd_readv; + dev->mtd.priv = dev; + dev->mtd.owner = THIS_MODULE; + +@@ -351,6 +366,12 @@ devinit_err: + } + + ++/* This function works similar to reguler strtoul. In addition, it ++ * allows some suffixes for a more human-readable number format: ++ * ki, Ki, kiB, KiB - multiply result with 1024 ++ * Mi, MiB - multiply result with 1024^2 ++ * Gi, GiB - multiply result with 1024^3 ++ */ + static int ustrtoul(const char *cp, char **endp, unsigned int base) + { + unsigned long result = simple_strtoul(cp, endp, base); +@@ -359,11 +380,16 @@ static int ustrtoul(const char *cp, char + result *= 1024; + case 'M': + result *= 1024; ++ case 'K': + case 'k': + result *= 1024; + /* By dwmw2 editorial decree, "ki", "Mi" or "Gi" are to be used. */ +- if ((*endp)[1] == 'i') +- (*endp) += 2; ++ if ((*endp)[1] == 'i') { ++ if ((*endp)[2] == 'B') ++ (*endp) += 3; ++ else ++ (*endp) += 2; ++ } + } + return result; + } +@@ -383,26 +409,6 @@ static int parse_num(size_t *num, const + } + + +-static int parse_name(char **pname, const char *token, size_t limit) +-{ +- size_t len; +- char *name; +- +- len = strlen(token) + 1; +- if (len > limit) +- return -ENOSPC; +- +- name = kmalloc(len, GFP_KERNEL); +- if (!name) +- return -ENOMEM; +- +- strcpy(name, token); +- +- *pname = name; +- return 0; +-} +- +- + static inline void kill_final_newline(char *str) + { + char *newline = strrchr(str, '\n'); +@@ -416,9 +422,16 @@ #define parse_err(fmt, args...) do { \ + return 0; \ + } while (0) + +-static int block2mtd_setup(const char *val, struct kernel_param *kp) ++#ifndef MODULE ++static int block2mtd_init_called = 0; ++static __initdata char block2mtd_paramline[80 + 12]; /* 80 for device, 12 for erase size */ ++#endif ++ ++ ++static int block2mtd_setup2(const char *val) + { +- char buf[80+12], *str=buf; /* 80 for device, 12 for erase size */ ++ char buf[80 + 12]; /* 80 for device, 12 for erase size */ ++ char *str = buf; + char *token[2]; + char *name; + size_t erase_size = PAGE_SIZE; +@@ -430,7 +443,7 @@ static int block2mtd_setup(const char *v + strcpy(str, val); + kill_final_newline(str); + +- for (i=0; i<2; i++) ++ for (i = 0; i < 2; i++) + token[i] = strsep(&str, ","); + + if (str) +@@ -439,18 +452,16 @@ static int block2mtd_setup(const char *v + if (!token[0]) + parse_err("no argument"); + +- ret = parse_name(&name, token[0], 80); +- if (ret == -ENOMEM) +- parse_err("out of memory"); +- if (ret == -ENOSPC) +- parse_err("name too long"); +- if (ret) +- return 0; ++ name = token[0]; ++ if (strlen(name) + 1 > 80) ++ parse_err("device name too long"); + + if (token[1]) { + ret = parse_num(&erase_size, token[1]); +- if (ret) ++ if (ret) { ++ kfree(name); + parse_err("illegal erase size"); ++ } + } + + add_device(name, erase_size); +@@ -459,13 +470,48 @@ static int block2mtd_setup(const char *v + } + + ++static int block2mtd_setup(const char *val, struct kernel_param *kp) ++{ ++#ifdef MODULE ++ return block2mtd_setup2(val); ++#else ++ /* If more parameters are later passed in via ++ /sys/module/block2mtd/parameters/block2mtd ++ and block2mtd_init() has already been called, ++ we can parse the argument now. */ ++ ++ if (block2mtd_init_called) ++ return block2mtd_setup2(val); ++ ++ /* During early boot stage, we only save the parameters ++ here. We must parse them later: if the param passed ++ from kernel boot command line, block2mtd_setup() is ++ called so early that it is not possible to resolve ++ the device (even kmalloc() fails). Deter that work to ++ block2mtd_setup2(). */ ++ ++ strlcpy(block2mtd_paramline, val, sizeof(block2mtd_paramline)); ++ ++ return 0; ++#endif ++} ++ ++ + module_param_call(block2mtd, block2mtd_setup, NULL, NULL, 0200); + MODULE_PARM_DESC(block2mtd, "Device to use. \"block2mtd=<dev>[,<erasesize>]\""); + + static int __init block2mtd_init(void) + { ++ int ret = 0; + INFO("version " VERSION); +- return 0; ++ ++#ifndef MODULE ++ if (strlen(block2mtd_paramline)) ++ ret = block2mtd_setup2(block2mtd_paramline); ++ block2mtd_init_called = 1; ++#endif ++ ++ return ret; + } + + |