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| author | Michal Pecio <michal.pecio@gmail.com> | 2026-05-18 08:31:21 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2026-06-09 13:28:53 +0300 |
| commit | f54b30f3316a7d45be25a2abfb3359db89e78cd5 (patch) | |
| tree | 27802a319c2307f432762c8e538e995eea01b3c5 /tools/perf/scripts/python/stackcollapse.py | |
| parent | 830c8a9b467e7d3a158483d37fa7dc13892b293a (diff) | |
| download | linux-f54b30f3316a7d45be25a2abfb3359db89e78cd5.tar.xz | |
usb: core: Fix SuperSpeed root hub wMaxPacketSize
commit d1e280334b7f0a1df441e08bd1f6a1bcc36b3bbb upstream.
There is no good reason to have wBytesPerInterval < wMaxPacketSize -
either one is too low or the other too high, and we may want to warn
about such descriptors. Start with cleaning up our own root hubs.
USB 3.2 section 10.15.1 sets wMaxPacketSize and wBytesPerInterval of
SuperSpeed hub status endpoints at 2 bytes, so reduce wMaxPacketSize
from its former value of 4, which was derived from USB 2.0 spec and
the kernel's USB_MAXCHILDREN limit. They don't apply because USB 3.2
10.15.2.1 specifies SuperSpeed hubs to have up to 15 ports.
Suggested-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Michal Pecio <michal.pecio@gmail.com>
Link: https://patch.msgid.link/20260518073121.7bc1da0f.michal.pecio@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools/perf/scripts/python/stackcollapse.py')
0 files changed, 0 insertions, 0 deletions