CVS commit: src/sys/arch/xen/xen

["Jaromir Dolecek" <jdolecek%netbsd.org@localhost>]

Module Name:    src
Committed By:   jdolecek
Date:           Wed Jul 28 21:38:50 UTC 2021

Modified Files:
        src/sys/arch/xen/xen: xbdback_xenbus.c

Log Message:
fix intentional, but eventually faulty off-by-one for the maximum number
of segments for I/O - this was supposed to allow MAXPHYS-size I/O even
with page offset, but actually ended up letting through I/O up to
MAXPHYS+PAGE_SIZE

the KASSERT(bcount < MAXPHYS) is kept as-is, since at that place the number
of segments should already be validated, so it's kernel bug if the size
is still too big there

fixes PR port-xen/56328 by Greg Oster


To generate a diff of this commit:
cvs rdiff -u -r1.97 -r1.98 src/sys/arch/xen/xen/xbdback_xenbus.c

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