Commit Graph

97009 Commits

Author SHA1 Message Date
Arnd Bergmann
556889a4ae briq_panel: BKL pushdown
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2008-06-20 14:05:55 -06:00
Arnd Bergmann
8324af6ddd bluetooth-vhci: BKL pushdown
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2008-06-20 14:05:55 -06:00
Arnd Bergmann
986837bade block-dasd_eer: BKL pushdown
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2008-06-20 14:05:54 -06:00
Arnd Bergmann
9a8bd2f76c bf561-coreb: BKL pushdown
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2008-06-20 14:05:54 -06:00
Arnd Bergmann
52e7c5e082 basler-excite: BKL pushdown
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2008-06-20 14:05:54 -06:00
Arnd Bergmann
864fe51671 apm_32: BKL pushdown
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2008-06-20 14:05:54 -06:00
Arnd Bergmann
2861ead38b apm-emulation: BKL pushdown
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2008-06-20 14:05:54 -06:00
Arnd Bergmann
b82829943c ans-lcd: BKL pushdown
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2008-06-20 14:05:54 -06:00
Arnd Bergmann
a076230134 agp-frontend: BKL pushdown
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2008-06-20 14:05:54 -06:00
Linus Torvalds
8f5934278d 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.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:54 -06:00
Stephen Rothwell
5ca6a93d80 bkl-removal viotape fixup
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:53 -06:00
Jonathan Corbet
9514dff918 Remove the lock_kernel() call from chrdev_open()
All in-kernel char device open() functions now either have their own
lock_kernel() calls or clearly do not need one.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:53 -06:00
Jonathan Corbet
a30427d92d 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.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:53 -06:00
Jonathan Corbet
f2b9857eee 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.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:53 -06:00
Jonathan Corbet
0b28067688 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.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:53 -06:00
Jonathan Corbet
6606470dd1 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.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:53 -06:00
Jonathan Corbet
b5b4aa67da usbdev: BKL pushdown
Add explicit lock_kernel() calls to usbdev_open()

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:53 -06:00
Jonathan Corbet
1af46fd72d USB Monitor: BKL pushdown
Add explicit lock_kernel() calls to mon_bin_open()

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:53 -06:00
Jonathan Corbet
b2f2ba01b2 printer gadget: BKL pushdown
Add explicit lock_kernel() calls to printer_open()

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:52 -06:00
Jonathan Corbet
26ce4f0684 adb: BKL pushdown
Put explicit lock_kernel() calls in adb_open().  The fact that
adb_release() already has them suggests this is necessary.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:52 -06:00
Jonathan Corbet
3462032d66 divamnt: BKL pushdown
Put explicit lock_kernel() calls into maint_open().

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:52 -06:00
Jonathan Corbet
a237f3bbaa CAPI: BKL pushdown
Put explicit lock_kernel() calls into capi_open()

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:52 -06:00
Jonathan Corbet
b0061a0ec4 changer: BKL pushdown
Add lock_kernel() calls to ch_open(), though the existing locking looks
adequate.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:52 -06:00
Jonathan Corbet
dea3f665d6 dpt_i20: BKL pushdown
Add lock_kernel() calls to adpt_open()

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:52 -06:00
Jonathan Corbet
9aaf20cbf5 videopix: BKL pushdown
Add explicit lock_kernel() calls to vfc_open().

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:52 -06:00
Jonathan Corbet
5e9829ad38 bpp: bkl pushdown
Put explicit lock_kernel() calls into bpp_open().  It has locking, but I'm
not convinced it won't race with ioctl().

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:51 -06:00
Jonathan Corbet
4541b5ec9f phantom: BKL pushdown
Add explicit lock_kernel calls to phantom_open().

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:51 -06:00
Jonathan Corbet
057e7c7ff9 infiniband: more BKL pushdown
Be extra-cautious and protect the remaining open() functions.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:51 -06:00
Jonathan Corbet
65f37b790b dsp56k: BKL pushdown
Put explicit lock_kernel calls into dsp56k_open().

[Stupid missing label error fixed]

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:51 -06:00
Jonathan Corbet
c0bed680f0 raw: BKL pushdown
Put explicit lock_kernel() calls into raw_open(), even though the existing
locking looks adequate.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:51 -06:00
Jonathan Corbet
b8c71d7ae2 tlckl: BKL pushdown
Put explicit lock_kernel calls into tlclk_open()

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:51 -06:00
Jonathan Corbet
f4943db14f xilinx icap: BKL pushdown
Add explicit lock_kernel() calls to hwicap_open() even though the existing
locking looks adequate.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:51 -06:00
Jonathan Corbet
f97259e35d vcs: BKL pushdown
Add explicit BKL to vcs_open().

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:51 -06:00
Jonathan Corbet
609f9e92b5 spidev: BKL pushdown
Add the BKL to spidev_open(), even though the existing locking looks
adequate.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:50 -06:00
Jonathan Corbet
d21c95c569 Add "no BKL needed" comments to several drivers
This documents the fact that somebody looked at the relevant open()
functions and concluded that, due to their trivial nature, no locking was
needed.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:50 -06:00
Jonathan Corbet
39d95b9d85 tty: cdev lock_kernel() pushdown
Parts of the serial code actually BUG() if we don't do this.
2008-06-20 14:05:50 -06:00
Jonathan Corbet
c43ef17450 snsc: cdev lock_kernel() pushdown
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:50 -06:00
Jonathan Corbet
78a3c3d7c6 sound: cdev lock_kernel() pushdown
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:50 -06:00
Jonathan Corbet
fc7f687a68 fbmem: cdev lock_kernel() pushdown
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:50 -06:00
Jonathan Corbet
5794e1b14b dvb: cdev lock_kernel() pushdown
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:50 -06:00
Jonathan Corbet
20613f24bc usbcore: cdev lock_kernel() pushdown
usb_open() is protected by a down_read(&minor_rwsem), but I'm not sure I
trust it to protect everything including subsidiary open() functions.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:49 -06:00
Jonathan Corbet
1bcaa0bd6f isdn: cdev lock_kernel() pushdown
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:49 -06:00
Jonathan Corbet
46787b481b gdth: cdev lock_kernel() pushdown
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:49 -06:00
Jonathan Corbet
b3369c68bf st: cdev lock_kernel() pushdown
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:49 -06:00
Jonathan Corbet
d4514d1bed aacraid: cdev lock_kernel() pushdown
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:49 -06:00
Jonathan Corbet
647d87bd1b osst: cdev lock_kernel() pushdown.
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:49 -06:00
Jonathan Corbet
eb09d3d4ee sg: cdev lock_kernel() pushdown
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:49 -06:00
Jonathan Corbet
04f4ac9d1b ide-tape: cdev lock_kernel() pushdown
->release() already has explicit lock_kernel() calls...

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:49 -06:00
Jonathan Corbet
16750c2f32 phonedev: cdev lock_kernel() pushdown
phone_open() looks OK, but I don't trust the subsidiary drivers (and ixj in
particular).

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:48 -06:00
Jonathan Corbet
70ffa16e60 drm: cdev lock_kernel() pushdown
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2008-06-20 14:05:48 -06:00