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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 <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Artem Bityutskiy 2013-03-14 13:27:40 +02:00 committed by David Woodhouse
parent cb70783c65
commit 660685d9d1
8 changed files with 19 additions and 40 deletions
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13
drivers/mtd/Kconfig
View File

@ -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

3
drivers/mtd/Makefile
View File

@ -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

1
drivers/mtd/chips/Kconfig
View File

@ -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

1
drivers/mtd/devices/Kconfig
View File

@ -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

20
drivers/mtd/mtdchar.c
View File

@ -38,6 +38,8 @@
#include <asm/uaccess.h>
#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 <dwmw2@infradead.org>");
MODULE_DESCRIPTION("Direct character-device access to MTD devices");
MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);

13
drivers/mtd/mtdcore.c
View File

@ -41,6 +41,7 @@
#include <linux/mtd/partitions.h>
#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);

7
drivers/mtd/mtdcore.h
View File

@ -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; \

1
drivers/mtd/onenand/Kconfig
View File

@ -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.