android_kernel_xiaomi_sm8350/drivers/usb
Pete Zaitcev 9f6a93f7bb usb: free DMA mappings if enqueue fails
This patch releases DMA resources if enqueue fails in the HCD.

Linux had this bug ever since we converted from virt_to_bus for 2.4.
It is difficult to hit. A user would need a significant memory pressure
or some other unusual condition.

It was reported to me by IBM. They ran a management application for
RSA II adapters which sent Bulk requests to an Interrupt endpoint.
Submissions got rejected by HCD due to an invalid interval value
and the swiotlb pool became depleted in the matter of hours.

We fixed the invalid interval issue in devio.c separately, but this
seems to be a bug worth fixing as well.

Signed-off-by: Pete Zaitcev <zaitcev@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-07-12 16:34:31 -07:00
..
atm USB: cxacru: Cleanup sysfs attribute code 2007-07-12 16:29:45 -07:00
class usblp: Don't let suspend to kill ->used 2007-06-08 16:24:29 -07:00
core usb: free DMA mappings if enqueue fails 2007-07-12 16:34:31 -07:00
gadget USB Gadget driver for Samsung s3c2410 ARM SoC 2007-07-12 16:34:30 -07:00
host ehci-hub: improved over-current recovery 2007-07-12 16:34:31 -07:00
image header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
misc USB: prevent char device open/deregister race 2007-07-12 16:29:48 -07:00
mon usbmon: Add class for binary interface 2007-07-12 16:29:47 -07:00
serial synchronization in usb_serial_put 2007-07-12 16:34:31 -07:00
storage USB: usb-storage: use kthread_stop() for the control thread 2007-07-12 16:34:31 -07:00
Kconfig USB: usb host side can be configured given PCMCIA 2007-07-12 16:34:31 -07:00
Makefile USB: r8a66597-hcd: host controller driver for R8A66597 2007-07-12 16:29:45 -07:00
README Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
usb-skeleton.c USB: usb-skeleton: usb anchor to implement flush 2007-07-12 16:34:28 -07:00

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.