CVS commit: src/sys/dev/usb

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

Module Name:    src
Committed By:   riastradh
Date:           Sun Mar 13 11:29:10 UTC 2022

Modified Files:
        src/sys/dev/usb: ehci.c ehcivar.h

Log Message:
ehci(4): Fix doorbell synchronization.

ehci_sync_hc was previously subject to spurious wakeup, in which case
the CPU might proceed from aborting and recycle a DMA buffer before
the hardware was done writing to it.  Now the code is not subject to
spurious wakeup -- it waits (up to the 1sec timeout) for the relevant
interrupt to be delivered, not for anything else.


To generate a diff of this commit:
cvs rdiff -u -r1.307 -r1.308 src/sys/dev/usb/ehci.c
cvs rdiff -u -r1.49 -r1.50 src/sys/dev/usb/ehcivar.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.