Don't open code the renaming of symlinks in sysfs
instead use the new helper function sysfs_rename_link
Acked-by: Tejun Heo <tj@kernel.org>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
The function name must be followed by a space, hypen, space, and a
short description.
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This fixes a warning on several pxa based machines:
arch/arm/mach-pxa/ssp.c:475: warning: initialization discards qualifiers from pointer target type
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Vikram Dhillon <dhillonv10@gmail.com>
Acked-by: Eric Miao <eric.y.miao@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Constify struct sysfs_ops.
This is part of the ops structure constification
effort started by Arjan van de Ven et al.
Benefits of this constification:
* prevents modification of data that is shared
(referenced) by many other structure instances
at runtime
* detects/prevents accidental (but not intentional)
modification attempts on archs that enforce
read-only kernel data at runtime
* potentially better optimized code as the compiler
can assume that the const data cannot be changed
* the compiler/linker move const data into .rodata
and therefore exclude them from false sharing
Signed-off-by: Emese Revfy <re.emese@gmail.com>
Acked-by: David Teigland <teigland@redhat.com>
Acked-by: Matt Domsch <Matt_Domsch@dell.com>
Acked-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Acked-by: Hans J. Koch <hjk@linutronix.de>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
Acked-by: Jens Axboe <jens.axboe@oracle.com>
Acked-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
These should be sysdev attributes, not class attributes. This patch
should resolve the problem.
Thanks to Stephen Rothwell for pointing out the problem.
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Andi Kleen <andi@firstfloor.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Constify struct kset_uevent_ops.
This is part of the ops structure constification
effort started by Arjan van de Ven et al.
Benefits of this constification:
* prevents modification of data that is shared
(referenced) by many other structure instances
at runtime
* detects/prevents accidental (but not intentional)
modification attempts on archs that enforce
read-only kernel data at runtime
* potentially better optimized code as the compiler
can assume that the const data cannot be changed
* the compiler/linker move const data into .rodata
and therefore exclude them from false sharing
Signed-off-by: Emese Revfy <re.emese@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
base.h is used by base drivers for sharing internal structures.
Turns out firmware_class does not depend on it at all so remove it.
Cc: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
No longer fall back to "add" and warn, but always require a valid
action-string written to the "uevent" file.
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
No recent mainstream system uses the /sbin/hotplug fork-bomb any more.
Disable it by default to reflect how it is used these days.
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
All major distros enable devtmpfs on recent systems, so remove
the EXPERIMENTAL flag, and make the description a bit more instructive.
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Before unlinking the inode, reset the current permissions of possible
references like hardlinks, so granted permissions can not be retained
across the device lifetime by creating hardlinks, in the unusual case
that there is a user-writable directory on the same filesystem.
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Several drivers just export a static string as class attributes.
Use the new extensible attribute support to define a simple
CLASS_ATTR_STRING() macro for this.
This will allow to remove code from drivers in followon patches.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Passing the attribute to the low level IO functions allows all kinds
of cleanups, by sharing low level IO code without requiring
an own function for every piece of data.
Also drivers can extend the attributes with own data fields
and use that in the low level function.
This makes the class attributes the same as sysdev_class attributes
and plain attributes.
This will allow further cleanups in drivers.
Full tree sweep converting all users.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This attribute is really a sysdev_class attribute, not a plain class attribute.
They are identical in layout currently, but this might not always be
the case.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Convert the node driver to sysdev_class attribute arrays. This
greatly cleans up the code and remove a lot of code.
Saves ~150 bytes of code on x86-64.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Use sysdev_class attribute arrays in node driver
Convert the node driver to sysdev_class attribute arrays. This
greatly cleans up the code and remove a lot of code.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Add a attribute array that is automatically registered and unregistered
to struct sysdev_class. This is similar to what struct class has.
A lot of drivers add list of attributes, so it's better to do
this easily in the common sysdev layer.
This adds a new field to struct sysdev_class. I audited the
whole tree and there are no dynamically allocated sysdev classes,
so this is fully compatible.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Using the new attribute argument convert the cpu driver class attributes
to carry the node state. Then use a shared function to do what a lot of
individual functions did before.
This eliminates an ugly macro.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Using the new attribute argument convert the node driver class
attributes to carry the node state. Then use a shared function to do
what a lot of individual functions did before.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Passing the attribute to the low level IO functions allows all kinds
of cleanups, by sharing low level IO code without requiring
an own function for every piece of data.
Also drivers can extend the attributes with own data fields
and use that in the low level function.
Similar to sysdev_attributes and normal attributes.
This is a tree-wide sweep, converting everything in one go.
No functional changes in this patch other than passing the new
argument everywhere.
Tested on x86, the non x86 parts are uncompiled.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Many legacy-style module create singleton platform devices themselves,
along with corresponding platform driver. Instead of replicating error
handling code in all such drivers, provide a helper that allocates and
registers a single platform device and a driver and binds them together.
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
sysfs is creating several devices in cuse class concurrently and with
CONFIG_SYSFS_DEPRECATED turned off, it triggers the following oops.
BUG: unable to handle kernel NULL pointer dereference at 0000000000000038
IP: [<ffffffff81158b0a>] sysfs_addrm_start+0x4a/0xf0
PGD 75bb067 PUD 75be067 PMD 0
Oops: 0000 [#1] PREEMPT SMP
last sysfs file: /sys/devices/system/cpu/cpu7/topology/core_siblings
CPU 1
Modules linked in: cuse fuse
Pid: 4737, comm: osspd Not tainted 2.6.31-work #77
RIP: 0010:[<ffffffff81158b0a>] [<ffffffff81158b0a>] sysfs_addrm_start+0x4a/0xf0
RSP: 0018:ffff88000042f8f8 EFLAGS: 00010296
RAX: ffff88000042ffd8 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff880007eef660 RDI: 0000000000000001
RBP: ffff88000042f918 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: ffffffff81158b0a R12: ffff88000042f928
R13: 00000000fffffff4 R14: 0000000000000000 R15: ffff88000042f9a0
FS: 00007fe93905a950(0000) GS:ffff880008600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000038 CR3: 00000000077c9000 CR4: 00000000000006e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process osspd (pid: 4737, threadinfo ffff88000042e000, task ffff880007eef040)
Stack:
ffff880005da10e8 0000000011cc8d6e ffff88000042f928 ffff880003d28a28
<0> ffff88000042f988 ffffffff811592d7 0000000000000000 0000000000000000
<0> 0000000000000000 0000000000000000 ffff88000042f958 0000000011cc8d6e
Call Trace:
[<ffffffff811592d7>] create_dir+0x67/0xe0
[<ffffffff811593a8>] sysfs_create_dir+0x58/0xb0
[<ffffffff8128ca7c>] ? kobject_add_internal+0xcc/0x220
[<ffffffff812942e1>] ? vsnprintf+0x3c1/0xb90
[<ffffffff8128cab7>] kobject_add_internal+0x107/0x220
[<ffffffff8128cd37>] kobject_add_varg+0x47/0x80
[<ffffffff8128ce53>] kobject_add+0x53/0x90
[<ffffffff81357d84>] device_add+0xd4/0x690
[<ffffffff81356c2b>] ? dev_set_name+0x4b/0x70
[<ffffffffa001a884>] cuse_process_init_reply+0x2b4/0x420 [cuse]
...
The problem is that kobject_add_internal() first adds a kobject to the
kset and then try to create sysfs directory for it. If the creation
fails, it remove the kobject from the kset. get_device_parent()
accesses class_dirs kset while only holding class_dirs.list_lock to
see whether the cuse class dir exists. But when it exists, it may not
have finished initialization yet or may fail and get removed soon. In
the above case, the former happened so the second one ends up trying
to create subdirectory under NULL sysfs_dirent.
Fix it by grabbing a mutex in get_device_parent().
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Colin Guthrie <cguthrie@mandriva.org>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
There are subsystems whose power management callbacks only need to
invoke the callbacks provided by device drivers. Still, their system
sleep PM callbacks should play well with the runtime PM callbacks,
so that devices suspended at run time can be left in that state for
a system sleep transition.
Provide a set of generic PM callbacks for such subsystems and
define convenience macros for populating dev_pm_ops structures.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
There are some dependencies between devices (in particular, between
EHCI USB controllers and their OHCI/UHCI siblings) which are not
reflected by the structure of the device tree. With synchronous
suspend and resume these dependencies are taken into accout
automatically, because the devices in question are always registered
in the right order, but to meet these constraints with asynchronous
suspend and resume the drivers of these devices will need to use
dpm_wait() in their suspend/resume routines, so introduce a helper
function allowing them to do that.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
