linux.git/drivers/usb/core/hcd.c, branch v5.14

usb: core: hcd: use map_urb_for_dma for single step set feature urb

2021-05-13T14:02:30+00:00

Use map_urb_for_dma() to improve the dma map code for single step
set feature request urb in test mode.

Signed-off-by: Li Jun 
Acked-by: Alan Stern 
Link: https://lore.kernel.org/r/1620452039-11694-3-git-send-email-jun.li@nxp.com
Signed-off-by: Greg Kroah-Hartman

usb: host: move EH SINGLE_STEP_SET_FEATURE implementation to core

2021-05-13T14:01:59+00:00

It is needed at USB Certification test for Embedded Host 2.0, and
the detail is at CH6.4.1.1 of On-The-Go and Embedded Host Supplement
to the USB Revision 2.0 Specification. Since other USB 2.0 capable
host like XHCI also need it, so move it to HCD core.

Acked-by: Alan Stern 
Signed-off-by: Peter Chen 
Signed-off-by: Li Jun 
Link: https://lore.kernel.org/r/1620452039-11694-1-git-send-email-jun.li@nxp.com
Signed-off-by: Greg Kroah-Hartman

usb: core: Track SuperSpeed Plus GenXxY

2021-03-23T12:12:37+00:00

Introduce ssp_rate field to usb_device structure to capture the
connected SuperSpeed Plus signaling rate generation and lane count with
the corresponding usb_ssp_rate enum.

Signed-off-by: Thinh Nguyen 
Link: https://lore.kernel.org/r/b7805d121e5ae4ad5ae144bd860b6ac04ee47436.1615432770.git.Thinh.Nguyen@synopsys.com
Signed-off-by: Greg Kroah-Hartman

kbuild: simplify access to the kernel's version

2021-02-16T03:01:45+00:00

Instead of storing the version in a single integer and having various
kernel (and userspace) code how it's constructed, export individual
(major, patchlevel, sublevel) components and simplify kernel code that
uses it.

This should also make it easier on userspace.

Signed-off-by: Sasha Levin 
Acked-by: Greg Kroah-Hartman 
Signed-off-by: Masahiro Yamada

kcov, usb: hide in_serving_softirq checks in __usb_hcd_giveback_urb

2021-01-07T13:17:29+00:00

Done opencode in_serving_softirq() checks in in_serving_softirq() to avoid
cluttering the code, hide them in kcov helpers instead.

Fixes: aee9ddb1d371 ("kcov, usb: only collect coverage from __usb_hcd_giveback_urb in softirq")
Signed-off-by: Andrey Konovalov 
Link: https://lore.kernel.org/r/aeb430c5bb90b0ccdf1ec302c70831c1a47b9c45.1609876340.git.andreyknvl@google.com
Signed-off-by: Greg Kroah-Hartman

kcov, usb: only collect coverage from __usb_hcd_giveback_urb in softirq

2020-10-28T12:10:54+00:00

Currently there's a KCOV remote coverage collection section in
__usb_hcd_giveback_urb(). Initially that section was added based on the
assumption that usb_hcd_giveback_urb() can only be called in interrupt
context as indicated by a comment before it. This is what happens when
syzkaller is fuzzing the USB stack via the dummy_hcd driver.

As it turns out, it's actually valid to call usb_hcd_giveback_urb() in task
context, provided that the caller turned off the interrupts; USB/IP does
exactly that. This can lead to a nested KCOV remote coverage collection
sections both trying to collect coverage in task context. This isn't
supported by KCOV, and leads to a WARNING.

Change __usb_hcd_giveback_urb() to only call kcov_remote_*() callbacks
when it's being executed in a softirq. As the result, the coverage from
USB/IP related usb_hcd_giveback_urb() calls won't be collected, but the
WARNING is fixed.

A potential future improvement would be to support nested remote coverage
collection sections, but this patch doesn't address that.

Reviewed-by: Dmitry Vyukov 
Acked-by: Marco Elver 
Signed-off-by: Andrey Konovalov 
Link: https://lore.kernel.org/r/f3a7a153f0719cb53ec385b16e912798bd3e4cf9.1602856358.git.andreyknvl@google.com
Signed-off-by: Greg Kroah-Hartman

usb: core: Replace in_interrupt() in comments

2020-10-28T11:32:59+00:00

The usage of in_interrupt() in drivers is phased out for various reasons.

Various comments use !in_interrupt() to describe calling context for
functions which might sleep. That's wrong because the calling context has
to be preemptible task context, which is not what !in_interrupt()
describes.

Replace !in_interrupt() with more accurate plain text descriptions.

The comment for usb_hcd_poll_rh_status() is misleading as this function is
called from all kinds of contexts including preemptible task
context. Remove it as there is obviously no restriction.

Signed-off-by: Ahmed S. Darwish 
Signed-off-by: Sebastian Andrzej Siewior 
Signed-off-by: Thomas Gleixner 
Acked-by: Alan Stern 
Cc: linux-usb@vger.kernel.org
Link: https://lore.kernel.org/r/20201019101110.851821025@linutronix.de
Signed-off-by: Greg Kroah-Hartman

usb: hcd: convert tasklets to use new tasklet_setup() API

2020-08-18T11:00:00+00:00

In preparation for unconditionally passing the
struct tasklet_struct pointer to all tasklet
callbacks, switch to using the new tasklet_setup()
and from_tasklet() to pass the tasklet pointer explicitly.

Signed-off-by: Romain Perier 
Signed-off-by: Allen Pais 
Link: https://lore.kernel.org/r/20200817090209.26351-4-allen.cryptic@gmail.com
Signed-off-by: Greg Kroah-Hartman

usb: Use fallthrough pseudo-keyword

2020-07-10T06:55:17+00:00

Replace the existing /* fall through */ comments and its variants with
the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary
fall-through markings when it is the case.

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through

Signed-off-by: Gustavo A. R. Silva 
Link: https://lore.kernel.org/r/20200707195607.GA4198@embeddedor
Signed-off-by: Greg Kroah-Hartman

usb: core: kcov: collect coverage from usb complete callback

2020-06-05T02:06:20+00:00

This patch adds kcov_remote_start/stop() callbacks around the urb
complete() callback that is executed in softirq context when dummy_hcd is
in use.  As the result, kcov can be used to collect coverage from those
callbacks, which is used to facilitate coverage-guided fuzzing with
syzkaller.

Signed-off-by: Andrey Konovalov 
Signed-off-by: Andrew Morton 
Reviewed-by: Dmitry Vyukov 
Cc: Alan Stern 
Cc: Alexander Potapenko 
Cc: Andrey Konovalov 
Cc: Greg Kroah-Hartman 
Cc: Marco Elver 
Link: http://lkml.kernel.org/r/4520671eeb604adbc2432c248b0c07fbaa5519ef.1585233617.git.andreyknvl@google.com
Link: http://lkml.kernel.org/r/2821d497ac1cdc0efb5e00df30271e4a67fc8009.1584655448.git.andreyknvl@google.com
Signed-off-by: Linus Torvalds