Skip to content

K
Kernel

openeuler / Kernel
1 年多 前同步成功

通知 8
Star 0
Fork 0
K
Kernel
切换分支/标签
  1. 22 9月, 2009 2 次提交
  3. 20 9月, 2009 1 次提交
  5. 16 9月, 2009 7 次提交
    • K
      Driver Core: devtmpfs - kernel-maintained tmpfs-based /dev · 2b2af54a
      由 Kay Sievers 提交于 
      Devtmpfs lets the kernel create a tmpfs instance called devtmpfs
very early at kernel initialization, before any driver-core device
is registered. Every device with a major/minor will provide a
device node in devtmpfs.

Devtmpfs can be changed and altered by userspace at any time,
and in any way needed - just like today's udev-mounted tmpfs.
Unmodified udev versions will run just fine on top of it, and will
recognize an already existing kernel-created device node and use it.
The default node permissions are root:root 0600. Proper permissions
and user/group ownership, meaningful symlinks, all other policy still
needs to be applied by userspace.

If a node is created by devtmps, devtmpfs will remove the device node
when the device goes away. If the device node was created by
userspace, or the devtmpfs created node was replaced by userspace, it
will no longer be removed by devtmpfs.

If it is requested to auto-mount it, it makes init=/bin/sh work
without any further userspace support. /dev will be fully populated
and dynamic, and always reflect the current device state of the kernel.
With the commonly used dynamic device numbers, it solves the problem
where static devices nodes may point to the wrong devices.

It is intended to make the initial bootup logic simpler and more robust,
by de-coupling the creation of the inital environment, to reliably run
userspace processes, from a complex userspace bootstrap logic to provide
a working /dev.
Signed-off-by: NKay Sievers <kay.sievers@vrfy.org>
Signed-off-by: NJan Blunck <jblunck@suse.de>
Tested-By: NHarald Hoyer <harald@redhat.com>
Tested-By: NScott James Remnant <scott@ubuntu.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
      2b2af54a
    • A
      driver core: platform_device_add_data(): use kmemdup() · daa41226
      由 Andrew Morton 提交于 
      Instead of open-coding it.
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
      daa41226
    • J
      Driver core: Add support for compatibility classes · 46227094
      由 Jean Delvare 提交于 
      When turning class devices into bus devices, we may need to
temporarily add links in sysfs so that user-space applications
are not confused. This is done by adding the following API:

* Functions to register and unregister compatibility classes.
  These appear in sysfs at the same location as regular classes, but
  instead of class devices, they contain links to bus devices.
* Functions to create and delete such links. Additionally, the caller
  can optionally pass a target device to which a "device" link should
  point (typically that would be the device's parent), to fully emulate
  the original class device.

The i2c subsystem will be the first user of this API, as i2c adapters
are being converted from class devices to bus devices.
Signed-off-by: NJean Delvare <khali@linux-fr.org>
Signed-off-by: NKay Sievers <kay.sievers@vrfy.org>
      46227094
    • M
      driver-core: move dma-coherent.c from kernel to driver/base · a56af876
      由 Ming Lei 提交于 
      Placing dma-coherent.c in driver/base is better than in kernel,
since it contains code to do per-device coherent dma memory
handling.
Signed-off-by: NMing Lei <tom.leiming@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
      a56af876
    • D
      driver model: constify attribute groups · a4dbd674
      由 David Brownell 提交于 
      Let attribute group vectors be declared "const".  We'd
like to let most attribute metadata live in read-only
sections... this is a start.
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
      a4dbd674
    • G
      Driver core: move dev_get/set_drvdata to drivers/base/dd.c · b4028437
      由 Greg Kroah-Hartman 提交于 
      No one should directly access the driver_data field, so remove the field
and make it private.  We dynamically create the private field now if it
is needed, to handle drivers that call get/set before they are
registered with the driver core.

Also update the copyright notices on these files while we are there.

Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
      b4028437
    • A
      Driver core: add new device to bus's list before probing · 2023c610
      由 Alan Stern 提交于 
      This patch (as1271) affects when new devices get linked into their
bus's list of devices.  Currently this happens after probing, and it
doesn't happen at all if probing fails.  Clearly this is wrong,
because at that point quite a few symbolic links have already been
created in sysfs.  We are committed to adding the device, so it should
be linked into the bus's list regardless.

In addition, this needs to happen before the uevent announcing the new
device gets issued.  Otherwise user programs might try to access the
device before it has been added to the bus.

To fix both these problems, the patch moves the call to
klist_add_tail() forward from bus_attach_device() to bus_add_device().
Since bus_attach_device() now does nothing but probe for drivers, it
has been renamed to bus_probe_device().  And lastly, the kerneldoc is
updated.
Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
CC: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
      2023c610
  7. 15 9月, 2009 2 次提交
  9. 23 8月, 2009 2 次提交
  11. 11 8月, 2009 1 次提交
    • M
      PM / Driver Core: Kill dev_pm_ops platform warning for now · 651b1f12
      由 Magnus Damm 提交于 
      Commit 783ea7d4
(Driver Core: Rework platform suspend/resume, print warning)
added a warning message printed for platform drivers that use the
legacy PM callbacks rather than struct dev_pm_ops.  Unfortunately,
this resulted in some confusion and made some people try to convert
drivers by replacing the old callbacks with struct dev_pm_ops in
automatic way, which generally is not a good idea.

Remove the platform device runtime dev_pm_ops warning for now,
because it's annoying to users and it's not really necessary right
now.

[rjw: Modified the changelog to be more informative.]
Signed-off-by: NMagnus Damm <damm@igel.co.jp>
Acked-by: NGreg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: NRafael J. Wysocki <rjw@sisk.pl>
      651b1f12
  13. 29 7月, 2009 2 次提交
  15. 25 7月, 2009 1 次提交
  17. 24 7月, 2009 1 次提交
  19. 22 7月, 2009 1 次提交
  21. 13 7月, 2009 2 次提交
  23. 09 7月, 2009 1 次提交
  25. 08 7月, 2009 1 次提交
  27. 17 6月, 2009 1 次提交
  29. 16 6月, 2009 10 次提交
  31. 13 6月, 2009 5 次提交