linux/drivers/usb
Paul Mundt 2c940db250 usb: r8a66597-hcd: Fix up spinlock recursion in root hub polling.
The current root hub polling code exhibits a spinlock recursion on the
private controller lock. r8a66597_root_hub_control() is called from
r8a66597_timer() which grabs the lock and disables IRQs. The following
chain emerges:

  r8a66597_timer() <-- lock taken
    r8a66597_root_hub_control()
      r8a66597_check_syssts()
        usb_hcd_poll_rh_status() <-- acquires the same lock
	/* insert death here */

The entire chain requires IRQs to be disabled, so we just unlock and
relock around the call to usb_hcd_poll_rh_status() while leaving the
IRQ state unchanged.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Acked-by: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
2010-02-05 11:53:28 +09:00
..
atm firmware_class: make request_firmware_nowait more useful 2009-12-11 11:24:52 -08:00
c67x00 usb/c67x00 endianness annotations 2008-06-04 08:06:01 -07:00
class USB: usbtmc: Use usb_clear_halt() instead of custom code. 2009-12-11 11:55:27 -08:00
core USB: Fix duplicate sysfs problem after device reset. 2010-01-20 15:24:35 -08:00
early USB: fix section mismatch in early ehci dbgp 2009-12-23 11:34:11 -08:00
gadget USB: audio gadget: free alsa devices when unloading 2009-12-23 11:34:20 -08:00
host usb: r8a66597-hcd: Fix up spinlock recursion in root hub polling. 2010-02-05 11:53:28 +09:00
image USB: remove unneeded printks from microtek driver 2009-09-23 06:46:34 -07:00
misc USB: Fix a bug on appledisplay.c regarding signedness 2009-12-23 11:34:20 -08:00
mon USB: add scatter-gather support to usbmon 2009-12-11 11:55:20 -08:00
musb USB: musb: workaround Blackfin FIFO anomalies 2009-12-23 11:34:19 -08:00
otg usb: otg: isp1301_omap: fix compile error 2009-12-23 11:34:19 -08:00
serial usb: serial: fix memory leak in generic driver 2010-01-20 15:24:33 -08:00
storage USB: fix usbstorage for 2770:915d delivers no FAT 2010-01-20 15:24:35 -08:00
wusbcore USB: wusb: correctly check size of security descriptor. 2009-12-11 11:55:26 -08:00
Kconfig USB: ehci: Allow EHCI to be built on OMAP3 2009-12-11 11:55:20 -08:00
Makefile USB: Fix double-linking of drivers/usb/otg when ULPI is selected 2009-12-23 11:34:10 -08:00
README USB: fix directory references in usb/README 2007-11-28 13:58:34 -08:00
usb-skeleton.c USB: skeleton: Correct use of ! and & 2009-12-11 11:55:14 -08:00

README

To understand all the Linux-USB framework, you'll use these resources:

    * This source code.  This is necessarily an evolving work, and
      includes kerneldoc that should help you get a current overview.
      ("make pdfdocs", and then look at "usb.pdf" for host side and
      "gadget.pdf" for peripheral side.)  Also, Documentation/usb has
      more information.

    * The USB 2.0 specification (from www.usb.org), with supplements
      such as those for USB OTG and the various device classes.
      The USB specification has a good overview chapter, and USB
      peripherals conform to the widely known "Chapter 9".

    * Chip specifications for USB controllers.  Examples include
      host controllers (on PCs, servers, and more); peripheral
      controllers (in devices with Linux firmware, like printers or
      cell phones); and hard-wired peripherals like Ethernet adapters.

    * Specifications for other protocols implemented by USB peripheral
      functions.  Some are vendor-specific; others are vendor-neutral
      but just standardized outside of the www.usb.org team.

Here is a list of what each subdirectory here is, and what is contained in
them.

core/		- This is for the core USB host code, including the
		  usbfs files and the hub class driver ("khubd").

host/		- This is for USB host controller drivers.  This
		  includes UHCI, OHCI, EHCI, and others that might
		  be used with more specialized "embedded" systems.

gadget/		- This is for USB peripheral controller drivers and
		  the various gadget drivers which talk to them.


Individual USB driver directories.  A new driver should be added to the
first subdirectory in the list below that it fits into.

image/		- This is for still image drivers, like scanners or
		  digital cameras.
../input/	- This is for any driver that uses the input subsystem,
		  like keyboard, mice, touchscreens, tablets, etc.
../media/	- This is for multimedia drivers, like video cameras,
		  radios, and any other drivers that talk to the v4l
		  subsystem.
../net/		- This is for network drivers.
serial/		- This is for USB to serial drivers.
storage/	- This is for USB mass-storage drivers.
class/		- This is for all USB device drivers that do not fit
		  into any of the above categories, and work for a range
		  of USB Class specified devices. 
misc/		- This is for all USB device drivers that do not fit
		  into any of the above categories.