From 660685d9d1b4730f0b5ca97fa95f272f99c63bce Mon Sep 17 00:00:00 2001 From: Artem Bityutskiy Date: Thu, 14 Mar 2013 13:27:40 +0200 Subject: [PATCH] mtd: merge mtdchar module with mtdcore The MTD subsystem has historically tried to be as configurable as possible. The side-effect of this is that its configuration menu is rather large, and we are gradually shrinking it. For example, we recently merged partitions support with the mtdcore. This patch does the next step - it merges the mtdchar module to mtdcore. And in this case this is not only about eliminating too fine-grained separation and simplifying the configuration menu. This is also about eliminating seemingly useless kernel module. Indeed, mtdchar is a module that allows user-space making use of MTD devices via /dev/mtd* character devices. If users do not enable it, they simply cannot use MTD devices at all. They cannot read or write the flash contents. Is it a sane and useful setup? I believe not. And everyone just enables mtdchar. Having mtdchar separate is also a little bit harmful. People sometimes miss the fact that they need to enable an additional configuration option to have user-space MTD interfaces, and then they wonder why on earth the kernel does not allow using the flash? They spend time asking around. Thus, let's just get rid of this module and make it part of mtd core. Note, mtdchar had additional configuration option to enable OTP interfaces, which are present on some flashes. I removed that option as well - it saves a really tiny amount space. [dwmw2: Strictly speaking, you can mount file systems on MTD devices just fine without the mtdchar (or mtdblock) devices; you just can't do other manipulations directly on the underlying device. But still I agree that it makes sense to make this unconditional. And Yay! we get to kill off an instance of checking CONFIG_foo_MODULE, which is an abomination that should never happen.] Signed-off-by: Artem Bityutskiy Signed-off-by: David Woodhouse --- drivers/mtd/Kconfig | 13 ------------- drivers/mtd/Makefile | 3 +-- drivers/mtd/chips/Kconfig | 1 - drivers/mtd/devices/Kconfig | 1 - drivers/mtd/mtdchar.c | 20 ++++---------------- drivers/mtd/mtdcore.c | 13 +++++++++---- drivers/mtd/mtdcore.h | 7 +++++-- drivers/mtd/onenand/Kconfig | 1 - 8 files changed, 19 insertions(+), 40 deletions(-) diff --git a/drivers/mtd/Kconfig b/drivers/mtd/Kconfig index 557bec599f4f..5fab4e6e8301 100644 --- a/drivers/mtd/Kconfig +++ b/drivers/mtd/Kconfig @@ -157,19 +157,6 @@ config MTD_BCM47XX_PARTS comment "User Modules And Translation Layers" -config MTD_CHAR - tristate "Direct char device access to MTD devices" - help - This provides a character device for each MTD device present in - the system, allowing the user to read and write directly to the - memory chips, and also use ioctl() to obtain information about - the device, or to erase parts of it. - -config HAVE_MTD_OTP - bool - help - Enable access to OTP regions using MTD_CHAR. - config MTD_BLKDEVS tristate "Common interface to block layer for MTD 'translation layers'" depends on BLOCK diff --git a/drivers/mtd/Makefile b/drivers/mtd/Makefile index 18a38e55b2f0..4cfb31e6c966 100644 --- a/drivers/mtd/Makefile +++ b/drivers/mtd/Makefile @@ -4,7 +4,7 @@ # Core functionality. obj-$(CONFIG_MTD) += mtd.o -mtd-y := mtdcore.o mtdsuper.o mtdconcat.o mtdpart.o +mtd-y := mtdcore.o mtdsuper.o mtdconcat.o mtdpart.o mtdchar.o obj-$(CONFIG_MTD_OF_PARTS) += ofpart.o obj-$(CONFIG_MTD_REDBOOT_PARTS) += redboot.o @@ -15,7 +15,6 @@ obj-$(CONFIG_MTD_BCM63XX_PARTS) += bcm63xxpart.o obj-$(CONFIG_MTD_BCM47XX_PARTS) += bcm47xxpart.o # 'Users' - code which presents functionality to userspace. -obj-$(CONFIG_MTD_CHAR) += mtdchar.o obj-$(CONFIG_MTD_BLKDEVS) += mtd_blkdevs.o obj-$(CONFIG_MTD_BLOCK) += mtdblock.o obj-$(CONFIG_MTD_BLOCK_RO) += mtdblock_ro.o diff --git a/drivers/mtd/chips/Kconfig b/drivers/mtd/chips/Kconfig index c219e3d098d9..e4696b37f3de 100644 --- a/drivers/mtd/chips/Kconfig +++ b/drivers/mtd/chips/Kconfig @@ -146,7 +146,6 @@ config MTD_CFI_I8 config MTD_OTP bool "Protection Registers aka one-time programmable (OTP) bits" depends on MTD_CFI_ADV_OPTIONS - select HAVE_MTD_OTP default n help This enables support for reading, writing and locking so called diff --git a/drivers/mtd/devices/Kconfig b/drivers/mtd/devices/Kconfig index ec4a2cc3e9b5..2a4d55e4b362 100644 --- a/drivers/mtd/devices/Kconfig +++ b/drivers/mtd/devices/Kconfig @@ -71,7 +71,6 @@ config MTD_DATAFLASH_WRITE_VERIFY config MTD_DATAFLASH_OTP bool "DataFlash OTP support (Security Register)" depends on MTD_DATAFLASH - select HAVE_MTD_OTP help Newer DataFlash chips (revisions C and D) support 128 bytes of one-time-programmable (OTP) data. The first half may be written diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c index c7292528c7bb..e0e59bf9b915 100644 --- a/drivers/mtd/mtdchar.c +++ b/drivers/mtd/mtdchar.c @@ -38,6 +38,8 @@ #include +#include "mtdcore.h" + static DEFINE_MUTEX(mtd_mutex); /* @@ -365,7 +367,6 @@ static void mtdchar_erase_callback (struct erase_info *instr) wake_up((wait_queue_head_t *)instr->priv); } -#ifdef CONFIG_HAVE_MTD_OTP static int otp_select_filemode(struct mtd_file_info *mfi, int mode) { struct mtd_info *mtd = mfi->mtd; @@ -395,9 +396,6 @@ static int otp_select_filemode(struct mtd_file_info *mfi, int mode) return 0; } -#else -# define otp_select_filemode(f,m) -EOPNOTSUPP -#endif static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd, uint64_t start, uint32_t length, void __user *ptr, @@ -890,7 +888,6 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg) break; } -#ifdef CONFIG_HAVE_MTD_OTP case OTPSELECT: { int mode; @@ -946,7 +943,6 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg) ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length); break; } -#endif /* This ioctl is being deprecated - it truncates the ECC layout */ case ECCGETLAYOUT: @@ -1242,7 +1238,7 @@ static struct file_system_type mtd_inodefs_type = { }; MODULE_ALIAS_FS("mtd_inodefs"); -static int __init init_mtdchar(void) +int __init init_mtdchar(void) { int ret; @@ -1268,18 +1264,10 @@ err_unregister_chdev: return ret; } -static void __exit cleanup_mtdchar(void) +void __exit cleanup_mtdchar(void) { unregister_filesystem(&mtd_inodefs_type); __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd"); } -module_init(init_mtdchar); -module_exit(cleanup_mtdchar); - -MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR); - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("David Woodhouse "); -MODULE_DESCRIPTION("Direct character-device access to MTD devices"); MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR); diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index 91c2efd22e1f..71877ff77cbf 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -41,6 +41,7 @@ #include #include "mtdcore.h" + /* * backing device capabilities for non-mappable devices (such as NAND flash) * - permits private mappings, copies are taken of the data @@ -96,11 +97,7 @@ EXPORT_SYMBOL_GPL(__mtd_next_device); static LIST_HEAD(mtd_notifiers); -#if defined(CONFIG_MTD_CHAR) || defined(CONFIG_MTD_CHAR_MODULE) #define MTD_DEVT(index) MKDEV(MTD_CHAR_MAJOR, (index)*2) -#else -#define MTD_DEVT(index) 0 -#endif /* REVISIT once MTD uses the driver model better, whoever allocates * the mtd_info will probably want to use the release() hook... @@ -1185,8 +1182,15 @@ static int __init init_mtd(void) proc_mtd = proc_create("mtd", 0, NULL, &mtd_proc_ops); + ret = init_mtdchar(); + if (ret) + goto out_procfs; + return 0; +out_procfs: + if (proc_mtd) + remove_proc_entry("mtd", NULL); err_bdi3: bdi_destroy(&mtd_bdi_ro_mappable); err_bdi2: @@ -1200,6 +1204,7 @@ err_reg: static void __exit cleanup_mtd(void) { + cleanup_mtdchar(); if (proc_mtd) remove_proc_entry("mtd", NULL); class_unregister(&mtd_class); diff --git a/drivers/mtd/mtdcore.h b/drivers/mtd/mtdcore.h index 9b10fed1ae2c..7b0353399a10 100644 --- a/drivers/mtd/mtdcore.h +++ b/drivers/mtd/mtdcore.h @@ -1,6 +1,6 @@ /* - * These are exported solely for the purpose of mtd_blkdevs.c. You - * should not use them for _anything_ else. + * These are exported solely for the purpose of mtd_blkdevs.c and mtdchar.c. + * You should not use them for _anything_ else. */ extern struct mutex mtd_table_mutex; @@ -14,6 +14,9 @@ int parse_mtd_partitions(struct mtd_info *master, const char * const *types, struct mtd_partition **pparts, struct mtd_part_parser_data *data); +int __init init_mtdchar(void); +void __exit cleanup_mtdchar(void); + #define mtd_for_each_device(mtd) \ for ((mtd) = __mtd_next_device(0); \ (mtd) != NULL; \ diff --git a/drivers/mtd/onenand/Kconfig b/drivers/mtd/onenand/Kconfig index 91467bb03634..eac7bb28360d 100644 --- a/drivers/mtd/onenand/Kconfig +++ b/drivers/mtd/onenand/Kconfig @@ -40,7 +40,6 @@ config MTD_ONENAND_SAMSUNG config MTD_ONENAND_OTP bool "OneNAND OTP Support" - select HAVE_MTD_OTP help One Block of the NAND Flash Array memory is reserved as a One-Time Programmable Block memory area.