linux-toradex.git/drivers/usb/core/devices.c, branch v2.6.34.8

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30T13:02:32+00:00

percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files.  percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.

percpu.h -> slab.h dependency is about to be removed.  Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability.  As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.

  http://userweb.kernel.org/~tj/misc/slabh-sweep.py

The script does the followings.

* Scan files for gfp and slab usages and update includes such that
  only the necessary includes are there.  ie. if only gfp is used,
  gfp.h, if slab is used, slab.h.

* When the script inserts a new include, it looks at the include
  blocks and try to put the new include such that its order conforms
  to its surrounding.  It's put in the include block which contains
  core kernel includes, in the same order that the rest are ordered -
  alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
  doesn't seem to be any matching order.

* If the script can't find a place to put a new include (mostly
  because the file doesn't have fitting include block), it prints out
  an error message indicating which .h file needs to be added to the
  file.

The conversion was done in the following steps.

1. The initial automatic conversion of all .c files updated slightly
   over 4000 files, deleting around 700 includes and adding ~480 gfp.h
   and ~3000 slab.h inclusions.  The script emitted errors for ~400
   files.

2. Each error was manually checked.  Some didn't need the inclusion,
   some needed manual addition while adding it to implementation .h or
   embedding .c file was more appropriate for others.  This step added
   inclusions to around 150 files.

3. The script was run again and the output was compared to the edits
   from #2 to make sure no file was left behind.

4. Several build tests were done and a couple of problems were fixed.
   e.g. lib/decompress_*.c used malloc/free() wrappers around slab
   APIs requiring slab.h to be added manually.

5. The script was run on all .h files but without automatically
   editing them as sprinkling gfp.h and slab.h inclusions around .h
   files could easily lead to inclusion dependency hell.  Most gfp.h
   inclusion directives were ignored as stuff from gfp.h was usually
   wildly available and often used in preprocessor macros.  Each
   slab.h inclusion directive was examined and added manually as
   necessary.

6. percpu.h was updated not to include slab.h.

7. Build test were done on the following configurations and failures
   were fixed.  CONFIG_GCOV_KERNEL was turned off for all tests (as my
   distributed build env didn't work with gcov compiles) and a few
   more options had to be turned off depending on archs to make things
   build (like ipr on powerpc/64 which failed due to missing writeq).

   * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
   * powerpc and powerpc64 SMP allmodconfig
   * sparc and sparc64 SMP allmodconfig
   * ia64 SMP allmodconfig
   * s390 SMP allmodconfig
   * alpha SMP allmodconfig
   * um on x86_64 SMP allmodconfig

8. percpu.h modifications were reverted so that it could be applied as
   a separate patch and serve as bisection point.

Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.

Signed-off-by: Tejun Heo 
Guess-its-ok-by: Christoph Lameter 
Cc: Ingo Molnar 
Cc: Lee Schermerhorn

USB: remove unused defintion of struct usb_device_status

2010-03-07T20:51:52+00:00

The recent rework of /proc/bus/usb/devices polling support made
this structure unused so let's remove it.

Signed-off-by: Dmitry Torokhov 
Signed-off-by: Linus Torvalds

usbfs: fix deadlock on 'usbfs_mutex', clean up poll

2010-03-07T00:34:34+00:00

The caller of usbfs_conn_disc_event() in some cases (but not always)
already holds usbfs_mutex, so trying to protect the event counter with
that lock causes nasty deadlocks.

The problem was introduced by commit 554f76962d ("USB: Remove BKL from
poll()") when the BLK protection was turned into using the mutex instead.

So fix this by using an atomic variable instead.  And while we're at it,
get rid of the atrocious naming of said variable and the waitqueue it is
associated with.

This also cleans up the unnecessary locking in the poll routine, since
the whole point of how the pollwait table works is that you can just add
yourself to the waiting list, and then check the condition you're
waiting for afterwards - avoiding all races.

It also gets rid of the unnecessary dynamic allocation of the device
status that just contained a single word.  We should use f_version for
this, as Dmitry Torokhov points out.  That simplifies everything
further.

Reported-and-tested-by: Jeff Chua 
Acked-by: Greg Kroah-Hartman 
Acked-by: Alan Stern 
Cc: Oliver Neukum 
Cc: Dmitry Torokhov 
Signed-off-by: Linus Torvalds

USB: Remove BKL from lseek implementations

2010-03-02T22:54:23+00:00

Replace it by
mutex_lock(&file->f_dentry->d_inode->i_mutex);
following the example of the generic method

Signed-off-by: Oliver Neukum 
Signed-off-by: Greg Kroah-Hartman

USB: Remove BKL from poll()

2010-03-02T22:54:22+00:00

Replace BKL with usbfs_mutex to protect a global counter
and a per file data structure

Signed-off-by: Oliver Neukum 
Signed-off-by: Greg Kroah-Hartman

USB: Don't use GFP_KERNEL while we cannot reset a storage device

2010-01-20T23:24:34+00:00

Memory allocations with GFP_KERNEL can cause IO to a storage
device which can fail resulting in a need to reset the device.
Therefore GFP_KERNEL cannot be safely used between usb_lock_device()
and usb_unlock_device(). Replace by GFP_NOIO.

Signed-off-by: Oliver Neukum 
Cc: stable 
Cc: Alan Stern 
Signed-off-by: Greg Kroah-Hartman

USB: add missing class descriptions used in usb/devices file

2009-07-12T22:16:39+00:00

Added descriptions (for WIRELESS_CONTROLLER and MISC) were taken from
the usb-devices script now included in usbutils.

Also sort the classes in the same order as in include/linux/usb/ch9.h
for easier comparison for future updates.

Signed-off-by: Frans Pop 
Signed-off-by: Greg Kroah-Hartman

USB: drivers: use USB API functions rather than constants

2009-03-24T23:20:28+00:00

This set of patches introduces calls to the following set of functions:

usb_endpoint_dir_in(epd)
usb_endpoint_dir_out(epd)
usb_endpoint_is_bulk_in(epd)
usb_endpoint_is_bulk_out(epd)
usb_endpoint_is_int_in(epd)
usb_endpoint_is_int_out(epd)
usb_endpoint_num(epd)
usb_endpoint_type(epd)
usb_endpoint_xfer_bulk(epd)
usb_endpoint_xfer_control(epd)
usb_endpoint_xfer_int(epd)
usb_endpoint_xfer_isoc(epd)

In some cases, introducing one of these functions is not possible, and it
just replaces an explicit integer value by one of the following constants:

USB_ENDPOINT_XFER_BULK
USB_ENDPOINT_XFER_CONTROL
USB_ENDPOINT_XFER_INT
USB_ENDPOINT_XFER_ISOC

An extract of the semantic patch that makes these changes is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// 
@r1@ struct usb_endpoint_descriptor *epd; @@

- ((epd->bmAttributes & \(USB_ENDPOINT_XFERTYPE_MASK\|3\)) ==
- \(USB_ENDPOINT_XFER_CONTROL\|0\))
+ usb_endpoint_xfer_control(epd)

@r5@ struct usb_endpoint_descriptor *epd; @@

- ((epd->bEndpointAddress & \(USB_ENDPOINT_DIR_MASK\|0x80\)) ==
-  \(USB_DIR_IN\|0x80\))
+ usb_endpoint_dir_in(epd)

@inc@
@@

#include 

@depends on !inc && (r1||r5)@
@@

+ #include 
  #include 
// 

Signed-off-by: Julia Lawall 
Signed-off-by: Greg Kroah-Hartman

usb: hub: add check for unsupported bus topology

2008-07-21T22:16:26+00:00

We can't allow hubs on the 7th tier as they would allow
devices on the 8th tier.

Signed-off-by: Felipe Balbi 
Cc: Alan Stern 
Signed-off-by: Greg Kroah-Hartman

USB: remove CVS keywords

2008-07-21T22:15:55+00:00

This patch removes CVS keywords that weren't updated for a long time
from comments.

Signed-off-by: Adrian Bunk 
Signed-off-by: Greg Kroah-Hartman