linux-stable.git/drivers/char/misc.c, branch linux-2.6.33.y

drivers/char/misc.c: use bitmap/bitops functions for dynamic minor number allocation

2009-12-15T16:53:27+00:00

Use DECLARE_BITMAP(), find_first_zero_bit(), set_bit() and clear_bit()
instead of rewriting code to do it with the minor number dynamic
allocation bitmap.

We need to invert the bit position to keep the code behaviour of using the
last minor numbers first, since we don't have a find_last_zero_bit.

Signed-off-by: Thadeu Lima de Souza Cascardo 
Cc: "H. Peter Anvin" 
Cc: Alan Cox 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

drivers/char/misc.c: clear allocation bit in minor bitmap when device register fails

2009-12-15T16:53:27+00:00

If there's a failure creating the device (because there's already one with
the same name, for example), the current implementation does not clear the
bit for the allocated minor and that number is lost for future
allocations.

Second, the test currently in misc_deregister is broken, since it does not
test for the 0 minor.

Signed-off-by: Thadeu Lima de Souza Cascardo 
Cc: "H. Peter Anvin" 
Cc: Alan Cox 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

misc: remove MAC pmu function declaration from misc device class

2009-12-15T16:53:26+00:00

Commit 8c8709334cec803368a432a33e0f2e116d48fe07 has removed the
pmu_device_init call from misc_init, but unlike other similar commits,
has not removed its declaration.

Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

drivers: Remove BKL from misc_open

2009-10-14T15:33:32+00:00

misc_open() is already serialized with misc_mtx. Remove the BKL
locking which got there via the BKL pushdown.

Signed-off-by: Thomas Gleixner 
Cc: Greg Kroah-Hartman 
LKML-Reference: <20091010153349.237173041@linutronix.de>

seq_file: constify seq_operations

2009-09-23T14:39:29+00:00

Make all seq_operations structs const, to help mitigate against
revectoring user-triggerable function pointers.

This is derived from the grsecurity patch, although generated from scratch
because it's simpler than extracting the changes from there.

Signed-off-by: James Morris 
Acked-by: Serge Hallyn 
Acked-by: Casey Schaufler 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Driver-Core: extend devnode callbacks to provide permissions

2009-09-19T19:50:38+00:00

This allows subsytems to provide devtmpfs with non-default permissions
for the device node. Instead of the default mode of 0600, null, zero,
random, urandom, full, tty, ptmx now have a mode of 0666, which allows
non-privileged processes to access standard device nodes in case no
other userspace process applies the expected permissions.

This also fixes a wrong assignment in pktcdvd and a checkpatch.pl complain.

Signed-off-by: Kay Sievers 
Signed-off-by: Greg Kroah-Hartman

Driver Core: misc: add nodename support for misc devices.

2009-06-16T04:30:25+00:00

This adds support for misc devices to report their requested nodename to
userspace.  It also updates a number of misc drivers to provide the
needed subdirectory and device name to be used for them.

Signed-off-by: Kay Sievers 
Signed-off-by: Jan Blunck 
Signed-off-by: Greg Kroah-Hartman

device create: char: convert device_create_drvdata to device_create

2008-10-16T16:24:42+00:00

Now that device_create() has been audited, rename things back to the
original call to be sane.

Signed-off-by: Greg Kroah-Hartman

device create: char: convert device_create to device_create_drvdata

2008-07-22T04:54:41+00:00

device_create() is race-prone, so use the race-free
device_create_drvdata() instead as device_create() is going away.

Signed-off-by: Greg Kroah-Hartman

misc: cdev lock_kernel() pushdown

2008-06-20T20:05:48+00:00

misc_open() looks fine, but who knows what all of the misc drivers are
doing in their open() functions?

Signed-off-by: Jonathan Corbet