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| author | David Brownell <dbrownell@users.sourceforge.net> | 2009-03-26 00:42:41 -0700 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2009-04-04 14:29:07 +0100 |
| commit | 1f24b5a8ecbb2a3c7080f418974d40e3ffedb221 (patch) | |
| tree | 07dfc44f62dac78bdf4a8cdb4d91d60f73c04ff4 /drivers/mtd/mtdpart.c | |
| parent | 9d63287a461c269edb39941744f4ff22223cf349 (diff) | |
| download | kernel_samsung_smdk4412-1f24b5a8ecbb2a3c7080f418974d40e3ffedb221.zip kernel_samsung_smdk4412-1f24b5a8ecbb2a3c7080f418974d40e3ffedb221.tar.gz kernel_samsung_smdk4412-1f24b5a8ecbb2a3c7080f418974d40e3ffedb221.tar.bz2 | |
[MTD] driver model updates
Update driver model support in the MTD framework, so it fits
better into the current udev-based hotplug framework:
- Each mtd_info now has a device node. MTD drivers should set
the dev.parent field to point to the physical device, before
setting up partitions or otherwise declaring MTDs.
- Those device nodes always map to /sys/class/mtdX device nodes,
which no longer depend on MTD_CHARDEV.
- Those mtdX sysfs nodes have a "starter set" of attributes;
it's not yet sufficient to replace /proc/mtd.
- Enabling MTD_CHARDEV provides /sys/class/mtdXro/ nodes and the
/sys/class/mtd*/dev attributes (for udev, mdev, etc).
- Include a MODULE_ALIAS_CHARDEV_MAJOR macro. It'll work with
udev creating the /dev/mtd* nodes, not just a static rootfs.
So the sysfs structure is pretty much what you'd expect, except
that readonly chardev nodes are a bit quirky.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/mtd/mtdpart.c')
| -rw-r--r-- | drivers/mtd/mtdpart.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c index 06d5b9d..02ce38f 100644 --- a/drivers/mtd/mtdpart.c +++ b/drivers/mtd/mtdpart.c @@ -356,6 +356,11 @@ static struct mtd_part *add_one_partition(struct mtd_info *master, slave->mtd.owner = master->owner; slave->mtd.backing_dev_info = master->backing_dev_info; + /* NOTE: we don't arrange MTDs as a tree; it'd be error-prone + * to have the same data be in two different partitions. + */ + slave->mtd.dev.parent = master->dev.parent; + slave->mtd.read = part_read; slave->mtd.write = part_write; @@ -508,7 +513,9 @@ out_register: * This function, given a master MTD object and a partition table, creates * and registers slave MTD objects which are bound to the master according to * the partition definitions. - * (Q: should we register the master MTD object as well?) + * + * We don't register the master, or expect the caller to have done so, + * for reasons of data integrity. */ int add_mtd_partitions(struct mtd_info *master, |