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From: Mateusz Guzik <mjg@FreeBSD.org>
Date: Fri, 21 Mar 2014 01:34:20 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r263460 - head/sys/kern
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Author: mjg
Date: Fri Mar 21 01:34:19 2014
New Revision: 263460
URL: http://svnweb.freebsd.org/changeset/base/263460

Log:
  Take filedesc lock only for reading when allocating new fdtable.
  
  Code populating the table does this already.
  
  MFC after:	1 week

Modified:
  head/sys/kern/kern_descrip.c

Modified: head/sys/kern/kern_descrip.c
==============================================================================
--- head/sys/kern/kern_descrip.c	Fri Mar 21 01:32:25 2014	(r263459)
+++ head/sys/kern/kern_descrip.c	Fri Mar 21 01:34:19 2014	(r263460)
@@ -1808,7 +1808,7 @@ fdinit(struct filedesc *fdp)
 	newfdp = malloc(sizeof *newfdp, M_FILEDESC, M_WAITOK | M_ZERO);
 	FILEDESC_LOCK_INIT(&newfdp->fd_fd);
 	if (fdp != NULL) {
-		FILEDESC_XLOCK(fdp);
+		FILEDESC_SLOCK(fdp);
 		newfdp->fd_fd.fd_cdir = fdp->fd_cdir;
 		if (newfdp->fd_fd.fd_cdir)
 			VREF(newfdp->fd_fd.fd_cdir);
@@ -1818,7 +1818,7 @@ fdinit(struct filedesc *fdp)
 		newfdp->fd_fd.fd_jdir = fdp->fd_jdir;
 		if (newfdp->fd_fd.fd_jdir)
 			VREF(newfdp->fd_fd.fd_jdir);
-		FILEDESC_XUNLOCK(fdp);
+		FILEDESC_SUNLOCK(fdp);
 	}
 
 	/* Create the file descriptor table. */