linux/Documentation/driver-api/usb, branch v5.5

docs: power: convert docs to ReST and rename to *.rst

2019-06-14T21:08:36Z

Convert the PM documents to ReST, in order to allow them to build with Sphinx. The conversion is actually: - add blank lines and indentation in order to identify paragraphs; - fix tables markups; - add some lists markups; - mark literal blocks; - adjust title markups. At its new index.rst, let's add a :orphan: while this is not linked to the main index.rst file, in order to avoid build warnings. Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Bjorn Helgaas Acked-by: Mark Brown Acked-by: Srivatsa S. Bhat (VMware)

USB: core: Fix bug caused by duplicate interface PM usage counter

2019-04-19T19:15:13Z

The syzkaller fuzzer reported a bug in the USB hub driver which turned out to be caused by a negative runtime-PM usage counter. This allowed a hub to be runtime suspended at a time when the driver did not expect it. The symptom is a WARNING issued because the hub's status URB is submitted while it is already active: URB 0000000031fb463e submitted while active WARNING: CPU: 0 PID: 2917 at drivers/usb/core/urb.c:363 The negative runtime-PM usage count was caused by an unfortunate design decision made when runtime PM was first implemented for USB. At that time, USB class drivers were allowed to unbind from their interfaces without balancing the usage counter (i.e., leaving it with a positive count). The core code would take care of setting the counter back to 0 before allowing another driver to bind to the interface. Later on when runtime PM was implemented for the entire kernel, the opposite decision was made: Drivers were required to balance their runtime-PM get and put calls. In order to maintain backward compatibility, however, the USB subsystem adapted to the new implementation by keeping an independent usage counter for each interface and using it to automatically adjust the normal usage counter back to 0 whenever a driver was unbound. This approach involves duplicating information, but what is worse, it doesn't work properly in cases where a USB class driver delays decrementing the usage counter until after the driver's disconnect() routine has returned and the counter has been adjusted back to 0. Doing so would cause the usage counter to become negative. There's even a warning about this in the USB power management documentation! As it happens, this is exactly what the hub driver does. The kick_hub_wq() routine increments the runtime-PM usage counter, and the corresponding decrement is carried out by hub_event() in the context of the hub_wq work-queue thread. This work routine may sometimes run after the driver has been unbound from its interface, and when it does it causes the usage counter to go negative. It is not possible for hub_disconnect() to wait for a pending hub_event() call to finish, because hub_disconnect() is called with the device lock held and hub_event() acquires that lock. The only feasible fix is to reverse the original design decision: remove the duplicate interface-specific usage counter and require USB drivers to balance their runtime PM gets and puts. As far as I know, all existing drivers currently do this. Signed-off-by: Alan Stern Reported-and-tested-by: syzbot+7634edaea4d0b341c625@syzkaller.appspotmail.com CC: Signed-off-by: Greg Kroah-Hartman

usb: typec: Improve Alt Mode documentation

2018-12-19T07:13:25Z

Adding the document to the usb index file and fixing a few references. Also, exposing the code examples as "literal blocks" so they are more easy to read. Signed-off-by: Heikki Krogerus Signed-off-by: Greg Kroah-Hartman

usb: typec: Bus type for alternate modes

2018-07-02T15:42:36Z

Introducing a simple bus for the alternate modes. Bus allows binding drivers to the discovered alternate modes the partners support. Signed-off-by: Heikki Krogerus Tested-by: Hans de Goede Signed-off-by: Greg Kroah-Hartman

Merge tag 'usb-for-v4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb into usb-next

2018-05-24T15:46:53Z

usb: changes for v4.18 merge window A total of 98 non-merge commits, the biggest part being in dwc3 this time around with a large refactoring of dwc3's transfer handling code. We also have a new driver for Aspeed virtual hub controller. Apart from that, just a list of miscellaneous fixes all over the place.

usb: dwc3: gadget: remove duplicated missed isoc handling

2018-05-21T07:00:53Z

Now, this part of the code is duplicated and brings no extra value to the driver. Let's remove it. Signed-off-by: Felipe Balbi

usb: dwc3: gadget: remove DWC3_EP_BUSY flag

2018-05-21T07:00:52Z

It has no use anymore. Signed-off-by: Felipe Balbi

Documentation: typec.rst: Use literal-block element with ascii art

2018-04-22T12:45:12Z

Using reStructuredText literal-block element with ascii-art. That prevents the ascii art from being processed as reStructuredText. Reported-by: Masanari Iida Fixes: bdecb33af34f ("usb: typec: API for controlling USB Type-C Multiplexers") Signed-off-by: Heikki Krogerus Reviewed-by: Jani Nikula Tested-by: Jani Nikula Reported-by: Hans de Goede Signed-off-by: Greg Kroah-Hartman

Merge tag 'usb-4.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb

2018-04-05T00:55:35Z

Pull USB/PHY updates from Greg KH: "Here is the big set of USB and PHY driver patches for 4.17-rc1. Lots of USB typeC work happened this round, with code moving from the staging directory into the "real" part of the kernel, as well as new infrastructure being added to be able to handle the different types of "roles" that typeC requires. There is also the normal huge set of USB gadget controller and driver updates, along with XHCI changes, and a raft of other tiny fixes all over the USB tree. And the PHY driver updates are merged in here as well as they interacted with the USB drivers in some places. All of these have been in linux-next for a while with no reported issues" * tag 'usb-4.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (250 commits) Revert "USB: serial: ftdi_sio: add Id for Physik Instrumente E-870" usb: musb: gadget: misplaced out of bounds check usb: chipidea: imx: Fix ULPI on imx53 usb: chipidea: imx: Cleanup ci_hdrc_imx_platform_flag usb: chipidea: usbmisc: small clean up usb: chipidea: usbmisc: evdo can be set e/o reset usb: chipidea: usbmisc: evdo is only specific to OTG port USB: serial: ftdi_sio: add Id for Physik Instrumente E-870 usb: dwc3: gadget: never call ->complete() from ->ep_queue() usb: gadget: udc: core: update usb_ep_queue() documentation usb: host: Remove the deprecated ATH79 USB host config options usb: roles: Fix return value check in intel_xhci_usb_probe() USB: gadget: f_midi: fixing a possible double-free in f_midi usb: core: Add USB_QUIRK_DELAY_CTRL_MSG to usbcore quirks usb: core: Copy parameter string correctly and remove superfluous null check USB: announce bcdDevice as well as idVendor, idProduct. USB:fix USB3 devices behind USB3 hubs not resuming at hibernate thaw usb: hub: Reduce warning to notice on power loss USB: serial: ftdi_sio: add support for Harman FirmwareHubEmulator USB: serial: cp210x: add ELDAT Easywave RX09 id ...

usb: musb: remove blackfin port

2018-03-26T13:57:12Z

The blackfin architecture is getting removed, so we can clean up all the special cases in the musb driver. Acked-by: Greg Kroah-Hartman Acked-by: Aaron Wu Acked-by: Bin Liu Cc: Stephen Rothwell [arnd: adding in fixups from Aaron and Stephen] Signed-off-by: Arnd Bergmann