16 Dec, 2009
1 commit
-
Makes use of skip_spaces() defined in lib/string.c for removing leading
spaces from strings all over the tree.It decreases lib.a code size by 47 bytes and reuses the function tree-wide:
text data bss dec hex filename
64688 584 592 65864 10148 (TOTALS-BEFORE)
64641 584 592 65817 10119 (TOTALS-AFTER)Also, while at it, if we see (*str && isspace(*str)), we can be sure to
remove the first condition (*str) as the second one (isspace(*str)) also
evaluates to 0 whenever *str == 0, making it redundant. In other words,
"a char equals zero is never a space".Julia Lawall tried the semantic patch (http://coccinelle.lip6.fr) below,
and found occurrences of this pattern on 3 more files:
drivers/leds/led-class.c
drivers/leds/ledtrig-timer.c
drivers/video/output.c@@
expression str;
@@( // ignore skip_spaces cases
while (*str && isspace(*str)) { \(str++;\|++str;\) }
|
- *str &&
isspace(*str)
)Signed-off-by: André Goddard Rosa
Cc: Julia Lawall
Cc: Martin Schwidefsky
Cc: Jeff Dike
Cc: Ingo Molnar
Cc: Thomas Gleixner
Cc: "H. Peter Anvin"
Cc: Richard Purdie
Cc: Neil Brown
Cc: Kyle McMartin
Cc: Henrique de Moraes Holschuh
Cc: David Howells
Cc:
Cc: Samuel Ortiz
Cc: Patrick McHardy
Cc: Takashi Iwai
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
29 Oct, 2009
3 commits
-
We create a dummy struct kernel_param on the stack for parsing each
array element, but we didn't initialize the flags word. This matters
for arrays of type "bool", where the flag indicates if it really is
an array of bools or unsigned int (old-style).Reported-by: Takashi Iwai
Signed-off-by: Rusty Russell
Cc: stable@kernel.org -
kp->arg is always true: it's the contents of that pointer we care about.
Reported-by: Takashi Iwai
Signed-off-by: Rusty Russell
Cc: stable@kernel.org -
e180a6b7759a "param: fix charp parameters set via sysfs" fixed the case
where charp parameters written via sysfs were freed, leaving drivers
accessing random memory.Unfortunately, storing a flag in the kparam struct was a bad idea: it's
rodata so setting it causes an oops on some archs. But that's not all:1) module_param_array() on charp doesn't work reliably, since we use an
uninitialized temporary struct kernel_param.
2) there's a fundamental race if a module uses this parameter and then
it's changed: they will still access the old, freed, memory.The simplest fix (ie. for 2.6.32) is to never free the memory. This
prevents all these problems, at cost of a memory leak. In practice, there
are only 18 places where a charp is writable via sysfs, and all are
root-only writable.Reported-by: Takashi Iwai
Cc: Sitsofe Wheeler
Cc: Frederic Weisbecker
Cc: Christof Schmitt
Signed-off-by: Rusty Russell
Cc: stable@kernel.org
24 Sep, 2009
1 commit
-
Some boot mechanisms require that kernel parameters are stored in a
separate file which is loaded to memory without further processing
(e.g. the "Load from FTP" method on s390). When such a file contains
newline characters, the kernel parameter preceding the newline might
not be correctly parsed (due to the newline being stuck to the end of
the actual parameter value) which can lead to boot failures.This patch improves kernel command line usability in such a situation
by allowing generic whitespace characters as separators between kernel
parameters.Signed-off-by: Peter Oberparleiter
Signed-off-by: Rusty Russell
12 Jun, 2009
3 commits
-
Impact: API cleanup
For historical reasons, 'bool' parameters must be an int, not a bool.
But there are around 600 users, so a conversion seems like useless churn.So we use __same_type() to distinguish, and handle both cases.
Signed-off-by: Rusty Russell
-
Impact: cleanup
Rather than hack KPARAM_KMALLOCED into the perm field, separate it out.
Since the perm field was 32 bits and only needs 16, we don't add bloat.Signed-off-by: Rusty Russell
-
It takes an 'int' for historical reasons, and there are only two
users: simply switch it over to bool.The other user (uvesafb.c) will get a (harmless-on-x86) warning until
the next patch is applied.Cc: Brad Douglas
Cc: Michal Januszewski
Signed-off-by: Rusty Russell
31 Mar, 2009
1 commit
-
Impact: fix crash on reading from /sys/module/.../ieee80211_default_rc_algo
The module_param type "charp" simply sets a char * pointer in the
module to the parameter in the commandline string: this is why we keep
the (mangled) module command line around. But when set via sysfs (as
about 11 charp parameters can be) this memory is freed on the way
out of the write(). Future reads hit random mem.So we kstrdup instead: we have to check we're not in early commandline
parsing, and we have to note when we've used it so we can reliably
kfree the parameter when it's next overwritten, and also on module
unload.(Thanks to Randy Dunlap for CONFIG_SYSFS=n fixes)
Reported-by: Sitsofe Wheeler
Diagnosed-by: Frederic Weisbecker
Tested-by: Frederic Weisbecker
Tested-by: Christof Schmitt
Signed-off-by: Rusty Russell
24 Oct, 2008
1 commit
-
Move free_module_param_attrs() into the CONFIG_MODULES section, since
it's only used inside there. Thus avoiding the warningkernel/params.c:514: warning: 'free_module_param_attrs' defined but not used
Signed-off-by: Linus Torvalds
22 Oct, 2008
3 commits
-
There are a lot of one-liner uses of __setup() in the kernel: they're
cumbersome and not queryable (definitely not settable) via /sys. Yet
it's ugly to simplify them to module_param(), because by default that
inserts a prefix of the module name (usually filename).So, introduce a "core_param". The parameter gets no prefix, but
appears in /sys/module/kernel/parameters/ (if non-zero perms arg). I
thought about using the name "core", but that's more common than
"kernel". And if you create a module called "kernel", you will die
a horrible death.Signed-off-by: Rusty Russell
-
Instead of insisting each new module_param sysfs entry is unique,
handle the case where it already exists (for builtin modules).The current code assumes that all identical prefixes are together in
the section: true for normal uses, but not necessarily so if someone
overrides MODULE_PARAM_PREFIX. More importantly, it's not true with
the new "core_param()" code which uses "kernel" as a prefix.This simplifies the caller for the builtin case, at a slight loss of
efficiency (we do the lookup every time to see if the directory
exists).Signed-off-by: Rusty Russell
Cc: Greg Kroah-Hartman -
The kparam code tries to handle over-length parameter prefixes at
runtime. Not only would I bet this has never been tested, it's not
clear that truncating names is a good idea either.So let's check at compile time. We need to move the #define to
moduleparam.h to do this, though.Signed-off-by: Rusty Russell
09 Feb, 2008
1 commit
-
Currently, for every sysfs node, the callers will be responsible for
implementing store operation, so many many callers are doing duplicate
things to validate input, they have the same mistakes because they are
calling simple_strtol/ul/ll/uul, especially for module params, they are
just numeric, but you can echo such values as 0x1234xxx, 07777888 and
1234aaa, for these cases, module params store operation just ignores
succesive invalid char and converts prefix part to a numeric although input
is acctually invalid.This patch tries to fix the aforementioned issues and implements
strict_strtox serial functions, kernel/params.c uses them to strictly
validate input, so module params will reject such values as 0x1234xxxx and
returns an error:write error: Invalid argument
Any modules which export numeric sysfs node can use strict_strtox instead of
simple_strtox to reject any invalid input.Here are some test results:
Before applying this patch:
[root@yangyi-dev /]# cat /sys/module/e1000/parameters/copybreak
4096
[root@yangyi-dev /]# echo 0x1000 > /sys/module/e1000/parameters/copybreak
[root@yangyi-dev /]# cat /sys/module/e1000/parameters/copybreak
4096
[root@yangyi-dev /]# echo 0x1000g > /sys/module/e1000/parameters/copybreak
[root@yangyi-dev /]# cat /sys/module/e1000/parameters/copybreak
4096
[root@yangyi-dev /]# echo 0x1000gggggggg > /sys/module/e1000/parameters/copybreak
[root@yangyi-dev /]# cat /sys/module/e1000/parameters/copybreak
4096
[root@yangyi-dev /]# echo 010000 > /sys/module/e1000/parameters/copybreak
[root@yangyi-dev /]# cat /sys/module/e1000/parameters/copybreak
4096
[root@yangyi-dev /]# echo 0100008 > /sys/module/e1000/parameters/copybreak
[root@yangyi-dev /]# cat /sys/module/e1000/parameters/copybreak
4096
[root@yangyi-dev /]# echo 010000aaaaa > /sys/module/e1000/parameters/copybreak
[root@yangyi-dev /]# cat /sys/module/e1000/parameters/copybreak
4096
[root@yangyi-dev /]#After applying this patch:
[root@yangyi-dev /]# cat /sys/module/e1000/parameters/copybreak
4096
[root@yangyi-dev /]# echo 0x1000 > /sys/module/e1000/parameters/copybreak
[root@yangyi-dev /]# cat /sys/module/e1000/parameters/copybreak
4096
[root@yangyi-dev /]# echo 0x1000g > /sys/module/e1000/parameters/copybreak
-bash: echo: write error: Invalid argument
[root@yangyi-dev /]# cat /sys/module/e1000/parameters/copybreak
4096
[root@yangyi-dev /]# echo 0x1000gggggggg > /sys/module/e1000/parameters/copybreak
-bash: echo: write error: Invalid argument
[root@yangyi-dev /]# echo 010000 > /sys/module/e1000/parameters/copybreak
[root@yangyi-dev /]# echo 0100008 > /sys/module/e1000/parameters/copybreak
-bash: echo: write error: Invalid argument
[root@yangyi-dev /]# echo 010000aaaaa > /sys/module/e1000/parameters/copybreak
-bash: echo: write error: Invalid argument
[root@yangyi-dev /]# cat /sys/module/e1000/parameters/copybreak
4096
[root@yangyi-dev /]# echo -n 4096 > /sys/module/e1000/parameters/copybreak
[root@yangyi-dev /]# cat /sys/module/e1000/parameters/copybreak
4096
[root@yangyi-dev /]#[akpm@linux-foundation.org: fix compiler warnings]
[akpm@linux-foundation.org: fix off-by-one found by tiwai@suse.de]
Signed-off-by: Yi Yang
Cc: Greg KH
Cc: "Randy.Dunlap"
Cc: Takashi Iwai
Cc: Hugh Dickins
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
07 Feb, 2008
1 commit
-
Fixing:
CHECK kernel/params.c
kernel/params.c:329:41: warning: incorrect type in argument 8 (different signedness)
kernel/params.c:329:41: expected int *num
kernel/params.c:329:41: got unsigned int *Signed-off-by: Richard Knutsson
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
29 Jan, 2008
1 commit
-
the original code use KOBJ_NAME_LEN for built-in module name length,
that's defined to 20 in linux/kobject.h, but this is not enough appearntly,
many module names are longer than this;
#define KOBJ_NAME_LEN 20another macro is MODULE_NAME_LEN defined in linux/module.h, I think this is
enough for module names:
#define MODULE_NAME_LEN (64 - sizeof(unsigned long))Signed-off-by: Denis Cheng
Signed-off-by: Rusty Russell
26 Jan, 2008
1 commit
-
* git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6: (200 commits)
[SCSI] usbstorage: use last_sector_bug flag universally
[SCSI] libsas: abstract STP task status into a function
[SCSI] ultrastor: clean up inline asm warnings
[SCSI] aic7xxx: fix firmware build
[SCSI] aacraid: fib context lock for management ioctls
[SCSI] ch: remove forward declarations
[SCSI] ch: fix device minor number management bug
[SCSI] ch: handle class_device_create failure properly
[SCSI] NCR5380: fix section mismatch
[SCSI] sg: fix /proc/scsi/sg/devices when no SCSI devices
[SCSI] IB/iSER: add logical unit reset support
[SCSI] don't use __GFP_DMA for sense buffers if not required
[SCSI] use dynamically allocated sense buffer
[SCSI] scsi.h: add macro for enclosure bit of inquiry data
[SCSI] sd: add fix for devices with last sector access problems
[SCSI] fix pcmcia compile problem
[SCSI] aacraid: add Voodoo Lite class of cards.
[SCSI] aacraid: add new driver features flags
[SCSI] qla2xxx: Update version number to 8.02.00-k7.
[SCSI] qla2xxx: Issue correct MBC_INITIALIZE_FIRMWARE command.
...
25 Jan, 2008
4 commits
-
Now that kobjects properly clean up their name structures, no matter if
they have a release function or not, we can drop this empty module
kobject release function too (it was needed prior to this because of the
way we handled static kobject names, we based the fact that if a release
function was present, then we could safely free the name string, now we
are more smart about things and only free names we have previously set.)Cc: Kay Sievers
Signed-off-by: Greg Kroah-Hartman -
This converts the code to use the new kobject functions, cleaning up the
logic in doing so.Cc: Kay Sievers
Signed-off-by: Greg Kroah-Hartman -
Dynamically create the kset instead of declaring it statically. We also
rename module_subsys to module_kset to catch all users of the variable.Cc: Kay Sievers
Signed-off-by: Greg Kroah-Hartman -
We don't need a "default" ktype for a kset. We should set this
explicitly every time for each kset. This change is needed so that we
can make ksets dynamic, and cleans up one of the odd, undocumented
assumption that the kset/kobject/ktype model has.This patch is based on a lot of help from Kay Sievers.
Nasty bug in the block code was found by Dave Young
Cc: Kay Sievers
Cc: Dave Young
Signed-off-by: Greg Kroah-Hartman
24 Jan, 2008
1 commit
-
This patch allows the various users of attribute_groups to selectively
allow the appearance of group attributes. The primary consumer of
this will be the transport classes in which we currently have
elaborate attribute selection algorithms to do this same thing.Acked-by: Greg KH
Signed-off-by: James Bottomley
23 Dec, 2007
1 commit
-
Due to the change in kobject name handling, the module kobject needs to
have a null release function to ensure that the name it previously set
will be properly cleaned up.All of this wierdness goes away in 2.6.25 with the rework of the kobject
name and cleanup logic, but this is required for 2.6.24.Thanks to Alexey Dobriyan for finding the problem, and to Kay Sievers
for pointing out the simple way to fix it after I tried many complex
ways.Cc: Alexey Dobriyan
Cc: Kay Sievers
Signed-off-by: Greg Kroah-Hartman
15 Nov, 2007
1 commit
-
Commit faf8c714f4508207a9c81cc94dafc76ed6680b44 caused a regression:
parameter names longer than MAX_KBUILD_MODNAME will now be rejected,
although we just need to keep the module name part that short. This patch
restores the old behaviour while still avoiding that memchr is called with
its length parameter larger than the total string length.Signed-off-by: Jan Kiszka
Cc: Dave Young
Cc: Greg KH
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
19 Oct, 2007
1 commit
-
If memchr argument is longer than strlen(kp->name), there will be some
weird result.It will casuse duplicate filenames in sysfs for the "nousb". kernel
warning messages are as bellow:sysfs: duplicate filename 'usbcore' can not be created
WARNING: at fs/sysfs/dir.c:416 sysfs_add_one()
[] sysfs_add_one+0xa0/0xe0
[] create_dir+0x48/0xb0
[] sysfs_create_dir+0x29/0x50
[] create_dir+0x1b/0x50
[] kobject_add+0x46/0x150
[] kobject_init+0x3a/0x80
[] kernel_param_sysfs_setup+0x50/0xb0
[] param_sysfs_builtin+0xee/0x130
[] param_sysfs_init+0x23/0x60
[] __next_cpu+0x12/0x20
[] kernel_init+0x0/0xb0
[] kernel_init+0x0/0xb0
[] do_initcalls+0x46/0x1e0
[] create_proc_entry+0x52/0x90
[] register_irq_proc+0x9c/0xc0
[] proc_mkdir_mode+0x34/0x50
[] kernel_init+0x0/0xb0
[] kernel_init+0x62/0xb0
[] kernel_thread_helper+0x7/0x14
=======================
kobject_add failed for usbcore with -EEXIST, don't try to register things with the same name in the same directory.
[] kobject_add+0xf6/0x150
[] kernel_param_sysfs_setup+0x50/0xb0
[] param_sysfs_builtin+0xee/0x130
[] param_sysfs_init+0x23/0x60
[] __next_cpu+0x12/0x20
[] kernel_init+0x0/0xb0
[] kernel_init+0x0/0xb0
[] do_initcalls+0x46/0x1e0
[] create_proc_entry+0x52/0x90
[] register_irq_proc+0x9c/0xc0
[] proc_mkdir_mode+0x34/0x50
[] kernel_init+0x0/0xb0
[] kernel_init+0x62/0xb0
[] kernel_thread_helper+0x7/0x14
=======================
Module 'usbcore' failed to be added to sysfs, error number -17
The system will be unstable now.Signed-off-by: Dave Young
Cc: Greg KH
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
17 Oct, 2007
1 commit
-
.. in an effort to make read-only whatever can be made, so that
CONFIG_DEBUG_RODATA can catch as many issues as possible.Signed-off-by: Jan Beulich
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
31 Jul, 2007
1 commit
-
This helps people when debugging problems like the ones that were in the
recent -mm releases.Signed-off-by: Greg Kroah-Hartman
12 Jul, 2007
1 commit
-
sysfs is now completely out of driver/module lifetime game. After
deletion, a sysfs node doesn't access anything outside sysfs proper,
so there's no reason to hold onto the attribute owners. Note that
often the wrong modules were accounted for as owners leading to
accessing removed modules.This patch kills now unnecessary attribute->owner. Note that with
this change, userland holding a sysfs node does not prevent the
backing module from being unloaded.For more info regarding lifetime rule cleanup, please read the
following message.http://article.gmane.org/gmane.linux.kernel/510293
(tweaked by Greg to not delete the field just yet, to make it easier to
merge things properly.)Signed-off-by: Tejun Heo
Cc: Cornelia Huck
Cc: Andrew Morton
Signed-off-by: Greg Kroah-Hartman
09 May, 2007
1 commit
-
This fixes the comment for the function param_array. Which lies that it
only *temporarily* mangle the input string @val.Signed-off-by: Bert Wesarg
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
03 May, 2007
1 commit
-
We need to work on cleaning up the relationship between kobjects, ksets and
ktypes. The removal of 'struct subsystem' is the first step of this,
especially as it is not really needed at all.Thanks to Kay for fixing the bugs in this patch.
Signed-off-by: Greg Kroah-Hartman
13 Apr, 2007
1 commit
-
Catch malformed kernel parameter usage of "param = value". Spaces are not
supported, but don't cause a kernel fault on such usage, just report an
error.Signed-off-by: Randy Dunlap
Acked-by: Larry Finger
Acked-by: Rusty Russell
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
24 Feb, 2007
1 commit
-
This reverts commit c353c3fb0700a3c17ea2b0237710a184232ccd7f.
It turns out that we end up with a loop trying to load the unix
module and calling netfilter to do that. Will redo the patch
later to not have this loop.Acked-by: Kay Sievers
Signed-off-by: Greg Kroah-Hartman
17 Feb, 2007
2 commits
-
Fix source files to build with CONFIG_SYSFS=n.
module_subsys is not available.SYSFS=n, MODULES=y: T:y
SYSFS=n, MODULES=n: T:ySYSFS=y, MODULES=y: T:y
SYSFS=y, MODULES=n: T:ySigned-off-by: Randy Dunlap
Signed-off-by: Greg Kroah-Hartman -
On recent systems, calls to /sbin/modprobe are handled by udev depending
on the kind of device the kernel has discovered. This patch creates an
uevent for the kernels internal request_module(), to let udev take control
over the request, instead of forking the binary directly by the kernel.
The direct execution of /sbin/modprobe can be disabled by setting:
/sys/module/kmod/mod_request_helper (/proc/sys/kernel/modprobe)
to an empty string, the same way /proc/sys/kernel/hotplug is disabled on an
udev system.Signed-off-by: Kay Sievers
Signed-off-by: Greg Kroah-Hartman
08 Feb, 2007
3 commits
-
/sys/module/usbcore/
|-- drivers
| |-- usb:hub -> ../../../subsystem/usb/drivers/hub
| |-- usb:usb -> ../../../subsystem/usb/drivers/usb
| `-- usb:usbfs -> ../../../subsystem/usb/drivers/usbfs
|-- holders
| |-- ehci_hcd -> ../../../module/ehci_hcd
| |-- uhci_hcd -> ../../../module/uhci_hcd
| |-- usb_storage -> ../../../module/usb_storage
| `-- usbhid -> ../../../module/usbhid
|-- initstateSigned-off-by: Kay Sievers
Signed-off-by: Greg Kroah-Hartman -
This changes the module core to only create the drivers/ directory if we
are going to put something in it.Cc: Kay Sievers
Signed-off-by: Greg Kroah-Hartman -
Signed-off-by: Kay Sievers
Signed-off-by: Greg Kroah-Hartman
06 Jan, 2007
1 commit
-
The parsing of some kernel parameters seem to enable irq's at a stage that
irq's are not supposed to be enabled (Particularly the ide kernel parameters).Having irq's enabled before the irq controller is initialized might lead to a
kernel panic. This patch only detects this behaviour and warns about wich
parameter caused it.[akpm@osdl.org: cleanups]
Signed-off-by: Ard van Breemen
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
30 Sep, 2006
2 commits
-
Initialize module_subsys earlier (or at least earlier than devices) since
it could be used very early in the boot process if kmod loads a module
before the device initcalls. Otherwise, kmod will crash in
kernel/module.c:mod_sysfs_setup() since the kset in module_subsys is not
initialized yet.I only noticed this problem because occasionally, kmod loads the modules
for my SCSI and Ethernet adapters very early, during the boot process
itself. I don't quite understand why it loads them sometimes and doesn't
load them other times. Or who is telling kmod to do so. Can someone
explain?Signed-off-by: Mark Huang
Cc: Greg KH
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Check driver layer return values in kernel/params.c
Signed-off-by: Randy Dunlap
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
