]> www.infradead.org Git - users/jedix/linux-maple.git/commit
usb: Flush altsetting 0 endpoints before reinitializating them after reset.
authorMathias Nyman <mathias.nyman@linux.intel.com>
Wed, 14 May 2025 13:25:20 +0000 (16:25 +0300)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 21 May 2025 11:11:27 +0000 (13:11 +0200)
commit89bb3dc13ac29a563f4e4c555e422882f64742bd
treea5547ba702afb8436a2ddd985902f7f25fba0c7e
parente33ebb133a245a48b543d6eb79768a66f233656b
usb: Flush altsetting 0 endpoints before reinitializating them after reset.

usb core avoids sending a Set-Interface altsetting 0 request after device
reset, and instead relies on calling usb_disable_interface() and
usb_enable_interface() to flush and reset host-side of those endpoints.

xHCI hosts allocate and set up endpoint ring buffers and host_ep->hcpriv
during usb_hcd_alloc_bandwidth() callback, which in this case is called
before flushing the endpoint in usb_disable_interface().

Call usb_disable_interface() before usb_hcd_alloc_bandwidth() to ensure
URBs are flushed before new ring buffers for the endpoints are allocated.

Otherwise host driver will attempt to find and remove old stale URBs
from a freshly allocated new ringbuffer.

Cc: stable <stable@kernel.org>
Fixes: 4fe0387afa89 ("USB: don't send Set-Interface after reset")
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20250514132520.225345-1-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/usb/core/hub.c