PR/57326 CVS commit: src/sys/dev/usb

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

The following reply was made to PR kern/57326; it has been noted by GNATS.

From: "Taylor R Campbell" <riastradh%netbsd.org@localhost>
To: gnats-bugs%gnats.NetBSD.org@localhost
Cc: 
Subject: PR/57326 CVS commit: src/sys/dev/usb
Date: Fri, 7 Apr 2023 09:39:48 +0000

 Module Name:	src
 Committed By:	riastradh
 Date:		Fri Apr  7 09:39:48 UTC 2023
 
 Modified Files:
 	src/sys/dev/usb: xhci.c xhcivar.h
 
 Log Message:
 xhci(4): Defer root intr xfers while polling.
 
 Root intr xfers require taking adaptive locks, which is forbidden
 while polling.
 
 This is not great -- any USB transfer completion callbacks might try
 to take adaptive locks, not just uhub_intr, and that will always
 causes trouble.  We get lucky with ukbd_intr because it's not
 MP-safe, so it relies only on the kernel lock (a spin lock) anyway.
 But this change brings xhci in line with ehci.
 
 PR kern/57326
 
 XXX pullup-8
 XXX pullup-9
 XXX pullup-10
 
 
 To generate a diff of this commit:
 cvs rdiff -u -r1.175 -r1.176 src/sys/dev/usb/xhci.c
 cvs rdiff -u -r1.22 -r1.23 src/sys/dev/usb/xhcivar.h
 
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.