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PR/25240 CVS commit: src/sys

The following reply was made to PR kern/25240; it has been noted by GNATS.

From: "Manuel Bouyer" <>
Subject: PR/25240 CVS commit: src/sys
Date: Sun, 25 May 2014 19:23:49 +0000

 Module Name:   src
 Committed By:  bouyer
 Date:          Sun May 25 19:23:49 UTC 2014
 Modified Files:
        src/sys/arch/xen/xen: xbd_xenbus.c
        src/sys/dev: cgd.c dksubr.c dkvar.h
 Log Message:
 As proposed in
 remove dk_start() and dk_iodone() from dksubr.c and move the related code
 to the underlying driver.
 This increase complexity only marginally: the underlying drivers have
 to do the while() loop themselves, but this can now be done properly with
 bufq_peek()/bufq_get(), removing the buffer from the queue at the right time.
 This handle both the recursion and reordering issues (the reordering
 issue is described here:
 the recursion isssue is PR #25240).
 Difference with the patch posted to tech-kern@: KASSERT() that the
 buffer we remove with bufq_get() is the same as the one we bufq_peek()'d
 just before.
 Hopefully this will allow more disk drivers to use dksubr.c
 To generate a diff of this commit:
 cvs rdiff -u -r1.62 -r1.63 src/sys/arch/xen/xen/xbd_xenbus.c
 cvs rdiff -u -r1.86 -r1.87 src/sys/dev/cgd.c
 cvs rdiff -u -r1.49 -r1.50 src/sys/dev/dksubr.c
 cvs rdiff -u -r1.18 -r1.19 src/sys/dev/dkvar.h
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.

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