Fix NULL pointer dereference and obsolete comments forgotten when
usbip server was converted from an interface driver to a device driver.
Signed-off-by: NAlexander Popov <alpopov@ptsecurity.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Fix WARN_ON() macro usage as suggested by Felipe.
Instead of using:
if (cond) {
   WARN_ON(1);
   do_stuff();
}

Use a better pattern with WARN_ON() placed in if condition:

if (WARN_ON(cond))
   do_stuff();
Signed-off-by: NKrzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

As vudc provides some new attributes using sysfs infrastructure,
add a suitable documentation file for those attributes.
Signed-off-by: NKrzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Felipe writes:

usb: changes for v4.7 merge window

Here's the big USB Gadget pull request. This time
not as large as usual with only 57 non-merge
commits.

The most important part here is, again, all the work
on dwc3. This time around we're treating all
endpoints (except for control endpoint) exactly the
same. They all have the same amount of TRBs on the
ring, they all treat the ring as an actual ring with
a link TRB pointing to the head, etc.

We're also helping the host side burst (on
SuperSpeed GEN1 or GEN2 at least) for as long as
possible until the endpoint returns NRDY.

Other than this big TRB ring rework on dwc3, we also
have a dwc3-omap DMA initialization fix, some extra
debugfs files to aid in some odd debug sessions and
a complete removal of our FIFO resizing logic.

We have a new quirk for some dwc3 P3 quirk in some
implementations.

The rest is basically non-critical fixes and the
usual cleanups.

Now that we calculate DCFG.NUMP, we can disable
dwc3's automatic calculation so we maximize our
chances of very high throughtput through the use of
bursts.
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

NumP field of DCFG register is used on NumP field of
ACK TP header and it tells the host how many packets
an endpoint can receive before waiting for
synchronization.

Documentation says it should be set to anything
<=bMaxBurst. Interestingly, however, this setting is
not per-endpoint how it should be (different
endpoints could have different burst sizes), but
things seem to work okay right now.
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Cleanup in probe if we fail to get dr_mode.
Signed-off-by: NJohn Youn <johnyoun@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

In case of DDMA mode we don't need to get an SOF interrupt so disable
the unmasking of SOF interrupt in DDMA mode.
Signed-off-by: NSevak Arakelyan <sevaka@synopsys.com>
Signed-off-by: NJohn Youn <johnyoun@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

This is safety change added while doing slub debugging.

Affected functions:
dwc2_hcd_qtd_unlink_and_free()
_dwc2_hcd_urb_enqueue()
Signed-off-by: NVardan Mikayelyan <mvardan@synopsys.com>
Signed-off-by: NJohn Youn <johnyoun@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

In host slave mode, the core asserts the rxready, txfifoempty interrupts
that get serviced in the gadget irq handler. Prevent servicing of these
when not in the gadget mode of operation.
Signed-off-by: NVardan Mikayelyan <mvardan@synopsys.com>
Signed-off-by: NJohn Youn <johnyoun@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Replaced the WARN_ON with a check and return of -EINVAL in the
dwc2_hsotg_ep_enable function if ep0 is passed in.
Signed-off-by: NVahram Aharonyan <vahrama@synopsys.com>
Signed-off-by: NJohn Youn <johnyoun@synopsys.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

if Start Transfer command fails, let's try a little
harder to figure out why the command failed and give
slightly better return codes. This will be usefulf
or isochronous endpoints, at least, which could
decide to retry a given request.
Signed-off-by: NKonrad Leszczynski <konrad.leszczynski@intel.com>
Signed-off-by: NRafal Redzimski <rafal.f.redzimski@intel.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

If a gadget driver loaded to a Superspeed-capable
peripheral controller, using a Superspeed cable,
doesn't provide Superspeed descriptors, we will get
a NULL pointer dereference.

In order to avoid that situation, we will try to
find any valid descriptors we can. If no set of
descriptors is passed in, then we'll let that gadget
oops anyhow.
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

For convenience, passing the dwc3 platform device as a
parameter to dwc3_pci_quirks() function.
Signed-off-by: NHeikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Setting the ACPI companion before calling dwc3_pci_quirks.
The ACPI companion will be set unconditionally as the
primary fwnode, overriding any previously set primary
fwnode. This will make sure that any build-in properties
added to the platform device will be added as the secondary
fwnode in cases where also ACPI companion exists.
Signed-off-by: NHeikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

In case host sends us an unsupported test mode, we
*must* stall this request. This will tell the host
that the selector is invalid and we won't put the
controller in unsupported test modes which could
have undetermined side-effects.
Signed-off-by: NFei Yang <fei.yang@intel.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

whc_init already calls whc_clean_up if an error occurs during
the initialization, so calling it again if whc_init fails at
the end of wch_probe will cause double free errors.  Fix this
by bailing out on an whc_init failure to a new label that avoids
doing the duplicated whc_clean_up.
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Thanks to switching to devm_gpiod_get:
1) We don't have to pass fwnode pointer
2) We can request initial GPIO value at getting call
This was successfully tested on Netgear R6250 (BCM4708).
Signed-off-by: NRafał Miłecki <zajec5@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Now that there are no more users for
xhci_plat_type_is(), we can safely remove it.
Acked-by: NYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: NMathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Now that the code has been refactored enough,
switching over to using ->plat_start() and
->init_quirk() becomes a very simple patch.

After this patch, there are no further uses for
xhci_plat_type_is() which will be removed in a
follow-up patch.
Acked-by: NYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: NMathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Just like RCAR's init_quirk() we want mvebu's to use
struct usb_hcd * as argument too. This is another
step towards removing xhci_plat_type_is().
Acked-by: NYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: NMathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

xhci_plat_setup() is the rightful place for
xhci_mvebu_mbus_init_quirk(), so let's move it there
in order to make it simpler to get rid of
xhci_plat_type_is() later on.
Acked-by: NYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: NMathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

these two methods will be used to hide
platform-specific details so we can get rid of
xhci_plat_type_is() in a later patch.
Acked-by: NYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: NMathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

We're preparing to remove xhci_plat_type_is() in
favor of a better approach where we define function
pointers ahead of time. This will let us make
assumptions about which platforms we're running on
and which platform-specific functions we should call.
Acked-by: NYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>
[delete extra comma in function parameters -Mathias]
Signed-off-by: NMathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Move duplicate code from xhci_queue_intr_tx()
and xhci_queue_isoc_tx_prepare() to the check_interval() function.
Signed-off-by: NAlexandr Ivanov <alexandr.sky@gmail.com>
Signed-off-by: NMathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Remove duplicate function xhci_urb_to_transfer_ring from xhci.c.
We have same function in xhci-ring.c.
Signed-off-by: NAlexandr Ivanov <alexandr.sky@gmail.com>
Signed-off-by: NMathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

In drivers/usb/host/xhci-ring.c there are two functions
(xhci_queue_bulk_tx and queue_bulk_sg_tx) that are very similar,
so a lot of code duplication.
This patch merges these functions into to one xhci_queue_bulk_tx.
Also counting the needed TRBs is merged and refactored.
Signed-off-by: NAlexandr Ivanov <alexandr.sky@gmail.com>
Signed-off-by: NMathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Restructure usb_sg_cancel() so we don't have to disable interrupts
while cancelling the URBs.
Suggested-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NDavid Mosberger <davidm@egauge.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

usb_submit_urb() may take quite long to execute.  For example, a
single sg list may have 30 or more entries, possibly leading to that
many calls to DMA-map pages.  This can cause interrupt latency of
several hundred micro-seconds.

Avoid the problem by releasing the io->lock spinlock and re-enabling
interrupts before calling usb_submit_urb().  This opens races with
usb_sg_cancel() and sg_complete().  Handle those races by using
usb_block_urb() to stop URBs from being submitted after
usb_sg_cancel() or sg_complete() with error.

Note that usb_unlink_urb() is guaranteed to return -ENODEV if
!io->urbs[i]->dev and since the -ENODEV case is already handled,
we don't have to check for !io->urbs[i]->dev explicitly.

Before this change, reading 512MB from an ext3 filesystem on a USB
memory stick showed a throughput of 12 MB/s with about 500 missed
deadlines.

With this change, reading the same file gave the same throughput but
only one or two missed deadlines.
Signed-off-by: NDavid Mosberger <davidm@egauge.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Add the driver to Kconfig to make it visible in menuconfig
and allow people to compile it.

This commit is a result of cooperation between Samsung R&D Institute
Poland and Open Operating Systems Student Society at University
of Warsaw (O2S3@UW) consisting of:

    Igor Kotrasinski <ikotrasinsk@gmail.com>
    Karol Kosik <karo9@interia.eu>
    Ewelina Kosmider <3w3lfin@gmail.com>
    Dawid Lazarczyk <lazarczyk.dawid@gmail.com>
    Piotr Szulc <ps347277@students.mimuw.edu.pl>

Tutor and project owner:
    Krzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: NIgor Kotrasinski <i.kotrasinsk@samsung.com>
Signed-off-by: NKrzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Modify userspace tools to allow exporting and connecting to vudc.

This commit is a result of cooperation between Samsung R&D Institute
Poland and Open Operating Systems Student Society at University
of Warsaw (O2S3@UW) consisting of:

   Igor Kotrasinski <ikotrasinsk@gmail.com>
   Karol Kosik <karo9@interia.eu>
   Ewelina Kosmider <3w3lfin@gmail.com>
   Dawid Lazarczyk <lazarczyk.dawid@gmail.com>
   Piotr Szulc <ps347277@students.mimuw.edu.pl>

Tutor and project owner:
   Krzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: NIgor Kotrasinski <i.kotrasinsk@samsung.com>
Signed-off-by: NEwelina Kosmider <3w3lfin@gmail.com>
[Various bug fixes and improvements]
Signed-off-by: NKrzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Adds an equivalent of usbip_host_driver for the vudc. Most
of the code is already shared, but this adds some vudc specific
code for getting information about devices.

Based on code created in cooperation with Open Operating Systems
Student Society at University of Warsaw (O2S3@UW) consisting of:

   Igor Kotrasinski <ikotrasinsk@gmail.com>
   Karol Kosik <karo9@interia.eu>
   Ewelina Kosmider <3w3lfin@gmail.com>
   Dawid Lazarczyk <lazarczyk.dawid@gmail.com>
   Piotr Szulc <ps347277@students.mimuw.edu.pl>

Tutor and project owner:
   Krzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: NKrzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Extract the code from current stub driver backend and a common
interface for both stub driver and vudc. This allows to share most
of the usbipd code for both of them.

Based on code created in cooperation with Open Operating Systems
Student Society at University of Warsaw (O2S3@UW) consisting of:

    Igor Kotrasinski <ikotrasinsk@gmail.com>
    Karol Kosik <karo9@interia.eu>
    Ewelina Kosmider <3w3lfin@gmail.com>
    Dawid Lazarczyk <lazarczyk.dawid@gmail.com>
    Piotr Szulc <ps347277@students.mimuw.edu.pl>

Tutor and project owner:
    Krzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: NKrzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Add sysfs attributes to allow controlling vudc from usbip tools.

dev_desc - device descriptor of current gadget. This is required to
	 be consisten with current usbip protocol and allow to list
	 exportable devices on given machine.

usbip_sockfd - allows to pass socket to kernel to start usbip transfer.

usbip_status - currnent status of device

This commit is a result of cooperation between Samsung R&D Institute
Poland and Open Operating Systems Student Society at University
of Warsaw (O2S3@UW) consisting of:

    Igor Kotrasinski <ikotrasinsk@gmail.com>
    Karol Kosik <karo9@interia.eu>
    Ewelina Kosmider <3w3lfin@gmail.com>
    Dawid Lazarczyk <lazarczyk.dawid@gmail.com>
    Piotr Szulc <ps347277@students.mimuw.edu.pl>

Tutor and project owner:
    Krzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: NIgor Kotrasinski <i.kotrasinsk@samsung.com>
Signed-off-by: NKarol Kosik <karo9@interia.eu>
[Various bug fixes, improvements and commit msg update]
Signed-off-by: NKrzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Add endpoints definitions and ops for both endpoints and gadget.
Add also a suitable platform driver and functions for handling
usbip events.

This commit is a result of cooperation between Samsung R&D Institute
Poland and Open Operating Systems Student Society at University
of Warsaw (O2S3@UW) consisting of:

    Igor Kotrasinski <ikotrasinsk@gmail.com>
    Karol Kosik <karo9@interia.eu>
    Ewelina Kosmider <3w3lfin@gmail.com>
    Dawid Lazarczyk <lazarczyk.dawid@gmail.com>
    Piotr Szulc <ps347277@students.mimuw.edu.pl>

Tutor and project owner:
    Krzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: NIgor Kotrasinski <i.kotrasinsk@samsung.com>
Signed-off-by: NKarol Kosik <karo9@interia.eu>
[Various bug fixes, improvements and commit msg update]
Signed-off-by: NKrzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

This file contains functions for returning requests to the client.
It also has functions that add requests completed in vudc_rx and
vudc_transfer to the return queue.

This commit is a result of cooperation between Samsung R&D Institute
Poland and Open Operating Systems Student Society at University
of Warsaw (O2S3@UW) consisting of:

    Igor Kotrasinski <ikotrasinsk@gmail.com>
    Karol Kosik <karo9@interia.eu>
    Ewelina Kosmider <3w3lfin@gmail.com>
    Dawid Lazarczyk <lazarczyk.dawid@gmail.com>
    Piotr Szulc <ps347277@students.mimuw.edu.pl>

Tutor and project owner:
    Krzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: NIgor Kotrasinski <i.kotrasinsk@samsung.com>
Signed-off-by: NKarol Kosik <karo9@interia.eu>
Signed-off-by: NKrzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

This file contains a function that simulates USB traffic, based on
the one in dummy_hcd. Is also handles udc-directed control
requests, and contains functions for setting up and controlling
a timer for the emulation.

This commit is a result of cooperation between Samsung R&D Institute
Poland and Open Operating Systems Student Society at University
of Warsaw (O2S3@UW) consisting of:

    Igor Kotrasinski <ikotrasinsk@gmail.com>
    Karol Kosik <karo9@interia.eu>
    Ewelina Kosmider <3w3lfin@gmail.com>
    Dawid Lazarczyk <lazarczyk.dawid@gmail.com>
    Piotr Szulc <ps347277@students.mimuw.edu.pl>

Tutor and project owner:
    Krzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: NIgor Kotrasinski <i.kotrasinsk@samsung.com>
Signed-off-by: NKarol Kosik <karo9@interia.eu>
Signed-off-by: NKrzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Add functions which allows to receive urbs from the client.
It receives traffic in a loop in a separate thread.

This commit is a result of cooperation between Samsung R&D Institute
Poland and Open Operating Systems Student Society at University
of Warsaw (O2S3@UW) consisting of:

    Igor Kotrasinski <ikotrasinsk@gmail.com>
    Karol Kosik <karo9@interia.eu>
    Ewelina Kosmider <3w3lfin@gmail.com>
    Dawid Lazarczyk <lazarczyk.dawid@gmail.com>
    Piotr Szulc <ps347277@students.mimuw.edu.pl>

Tutor and project owner:
    Krzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: NIgor Kotrasinski <i.kotrasinsk@samsung.com>
Signed-off-by: NKarol Kosik <karo9@interia.eu>
Signed-off-by: NKrzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Add main vudc module file. This allows us to register suitable
platform device and driver (just like dummy_hcd does).

Currently number of vudc instances is determined using module
parameter but whole infrastructure is suitable to make vudc
creation dynamic (for example via configfs).

This commit is a result of cooperation between Samsung R&D Institute
Poland and Open Operating Systems Student Society at University
of Warsaw (O2S3@UW) consisting of:

    Igor Kotrasinski <ikotrasinsk@gmail.com>
    Karol Kosik <karo9@interia.eu>
    Ewelina Kosmider <3w3lfin@gmail.com>
    Dawid Lazarczyk <lazarczyk.dawid@gmail.com>
    Piotr Szulc <ps347277@students.mimuw.edu.pl>

Tutor and project owner:
    Krzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: NIgor Kotrasinski <i.kotrasinsk@samsung.com>
Signed-off-by: NKarol Kosik <karo9@interia.eu>
[Various bug fixes and commit message update]
Signed-off-by: NKrzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Add constants for VUDC events in usbip_common.h
and make use of them in usbip_common.c.

This commit is a result of cooperation between Samsung R&D Institute
Poland and Open Operating Systems Student Society at University
of Warsaw (O2S3@UW) consisting of:

    Igor Kotrasinski <ikotrasinsk@gmail.com>
    Karol Kosik <karo9@interia.eu>
    Ewelina Kosmider <3w3lfin@gmail.com>
    Dawid Lazarczyk <lazarczyk.dawid@gmail.com>
    Piotr Szulc <ps347277@students.mimuw.edu.pl>

Tutor and project owner:
    Krzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: NIgor Kotrasinski <i.kotrasinsk@samsung.com>
Signed-off-by: NKarol Kosik <karo9@interia.eu>
[Small fixes and commit message update]
Signed-off-by: NKrzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>