Linus Torvalds [Tue, 20 May 2008 02:53:01 +0000 (19:53 -0700)]
Replace BKL with superblock lock in fat/msdos/vfat
This replaces the use of the BKL in the FAT family of filesystems with the
existing superblock lock instead.
The code already appears to do mostly proper locking with its own private
spinlocks (and mutexes), but while the BKL could possibly have been
dropped entirely, converting it to use the superblock lock (which is just
a regular mutex) is the conservative thing to do.
As a per-filesystem mutex, it not only won't have any of the possible
latency issues related to the BKL, but the lock is obviously private to
the particular filesystem instance and will thus not cause problems for
entirely unrelated users like the BKL can.
Jonathan Corbet [Sun, 18 May 2008 21:39:11 +0000 (15:39 -0600)]
Add a comment in chrdev_open()
I stared at this code for a while and almost deleted it before
understanding crept into my slow brain. Hopefully this makes life easier
for the next person to happen on it.
Jonathan Corbet [Sun, 18 May 2008 21:32:43 +0000 (15:32 -0600)]
Add a bunch of cycle_kernel_lock() calls
All of the open() functions which don't need the BKL on their face may
still depend on its acquisition to serialize opens against driver
initialization. So make those functions acquire then release the BKL to be
on the safe side.
Jonathan Corbet [Sun, 18 May 2008 20:27:41 +0000 (14:27 -0600)]
Add cycle_kernel_lock()
A number of driver functions are so obviously trivial that they do not need
the big kernel lock - at least not overtly. It turns out that the
acquisition of the BKL in driver open() functions can perform a sort of
poor-hacker's serialization function, delaying the open operation until the
driver is certain to have completed its initialization. Add a simple
cycle_kernel_lock() function for these cases to make it clear that there is
no need to *hold* the BKL, just to be sure that we can acquire it.
Jonathan Corbet [Fri, 16 May 2008 20:28:31 +0000 (14:28 -0600)]
videodev: BKL pushdown
Put explicit lock_kernel() calls into videodev_open(). That function
itself seems OK, but one never knows about all the open() functions
provided by underlying video drivers.
Linus Torvalds [Sun, 18 May 2008 20:56:54 +0000 (13:56 -0700)]
Merge branch 'i2c-for-linus' of git://jdelvare.pck.nerim.net/jdelvare-2.6
* 'i2c-for-linus' of git://jdelvare.pck.nerim.net/jdelvare-2.6:
i2c/max6875: Really prevent 24RF08 corruption
i2c-amd756: Fix functionality flags
i2c: Kill the old driver matching scheme
i2c: Convert remaining new-style drivers to use module aliasing
i2c: Switch pasemi to the new device/driver matching scheme
i2c: Clean up Blackfin BF527 I2C device declarations
i2c-nforce2: Disable the second SMBus channel on the DFI Lanparty NF4 Expert
i2c: New co-maintainer
Geert Uytterhoeven [Sun, 18 May 2008 18:47:24 +0000 (20:47 +0200)]
m68k: Add multi_defconfig
Add multi_defconfig, to build a kernel for all supported m68k platforms,
excluding Sun 3 (Sun 3 kernels are incompatible with all other m68k platforms)
Geert Uytterhoeven [Sun, 18 May 2008 18:47:21 +0000 (20:47 +0200)]
m68k: Prefix ISA type with ISA_TYPE_
The *_ISA type defines are quite generic and cause namespace conflicts
(e.g. with `AMIGAHW_DECLARE(GG2_ISA)' in <asm/amigahw.h>) for some kernel
configurations. Use ISA_TYPE_* to avoid such conflicts.
Geert Uytterhoeven [Sun, 18 May 2008 18:47:12 +0000 (20:47 +0200)]
m68k: Make gcc aware that BUG() does not return
Use `__builtin_trap()' instead of `asm volatile("illegal")' in the m68k BUG()
macros (as suggested by Andrew Pinski), to kill warnings in code that assumes
BUG() does not return.
Geert Uytterhoeven [Sun, 18 May 2008 18:47:09 +0000 (20:47 +0200)]
m68k: FB_HP300 depends on DIO and doesnt need FB_CFB_FILLRECT
Correct FB_HP300 dependencies:
- FB_HP300 doesn't depend only on HP300, but also on DIO (which depends on
HP300)
- FB_HP300 does not need FB_CFB_FILLRECT
Jean Delvare [Sun, 18 May 2008 18:49:41 +0000 (20:49 +0200)]
i2c/max6875: Really prevent 24RF08 corruption
i2c-core takes care of the possible corruption of 24RF08 chips for
quite some times, so device devices no longer need to do it. And they
really should not, as applying the prevention twice voids it.
I thought that I had fixed all drivers long ago but apparently I had
missed that one.
Signed-off-by: Jean Delvare <khali@linux-fr.org> Cc: Ben Gardner <bgardner@wabtec.com>
Jean Delvare [Sun, 18 May 2008 18:49:40 +0000 (20:49 +0200)]
i2c: Convert remaining new-style drivers to use module aliasing
Update all the remaining new-style i2c drivers to use standard module
aliasing instead of the old driver_name/type driver matching scheme.
Note that the tuner driver is a bit quirky at the moment, as it
overwrites i2c_client.name with arbitrary strings. We write "tuner"
back on remove, to make sure that driver cycling will work properly,
but there may still be troublesome corner cases.
Jean Delvare [Sun, 18 May 2008 18:49:40 +0000 (20:49 +0200)]
i2c-nforce2: Disable the second SMBus channel on the DFI Lanparty NF4 Expert
There is a strange chip at 0x2e on the second SMBus channel of the
DFI Lanparty NF4 Expert motherboard. Accessing the chip reboots the
system. As there's nothing interesting on this SMBus channel, the
easiest and safest thing to do is to disable it on that board.
This is a better fix to bug #5889 than the it87 driver update that was
done originally:
http://bugzilla.kernel.org/show_bug.cgi?id=5889
Jean Delvare [Sun, 18 May 2008 18:49:40 +0000 (20:49 +0200)]
i2c: New co-maintainer
Ben Dooks agreed to become my co-maintainer for the i2c subsystem. In
particular, Ben will help with drivers for embedded systems, of which
my experience is inexistent. Thanks Ben and welcome on board!
Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Ben Dooks <ben-linux@fluff.org>
Mariusz Kozlowski [Thu, 15 May 2008 18:52:24 +0000 (11:52 -0700)]
[ARM] fix parenthesis in include/asm-arm/arch-omap/control.h
Parenthesis fix in include/asm-arm/arch-omap/control.h
Signed-off-by: Mariusz Kozlowski <m.kozlowski@tuxland.pl> Cc: Paul Walmsley <paul@pwsan.com> Cc: Tony Lindgren <tony@atomide.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Michael Abbott [Wed, 14 May 2008 23:29:24 +0000 (16:29 -0700)]
[ARM] colibri: fix support for DM9000 ethernet device
Two changes are necessary to enable proper operation of the DM9000 device with
the Colibri PXA 270 board: firstly, the IRQ type needs to be configured for
rising edge interrupts, and secondly this configuration needs to be
communicated through to the DM9000.
[akpm@linux-foundation.org: remove set_irq_type() call as per ben-linux request] Signed-off-by: Michael Abbott <michael.abbott@diamond.ac.uk> Cc: Daniel Mack <daniel@caiaq.org> Cc: Jeff Garzik <jeff@garzik.org> Cc: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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