Author: jamie
Date: Thu Feb 21 02:41:37 2013
New Revision: 247071
URL: http://svnweb.freebsd.org/changeset/base/247071
Log:
Don't worry if a module is already loaded when looking for a fstype to mount
(possible in a race condition).
Reviewed by: kib
MFC after: 1 week
Modified:
head/sys/kern/vfs_init.c
Modified: head/sys/kern/vfs_init.c
==============================================================================
--- head/sys/kern/vfs_init.c Thu Feb 21 02:40:20 2013 (r247070)
+++ head/sys/kern/vfs_init.c Thu Feb 21 02:41:37 2013 (r247071)
@@ -122,7 +122,7 @@ struct vfsconf *
vfs_byname_kld(const char *fstype, struct thread *td, int *error)
{
struct vfsconf *vfsp;
- int fileid;
+ int fileid, loaded;
vfsp = vfs_byname(fstype);
if (vfsp != NULL)
@@ -130,13 +130,17 @@ vfs_byname_kld(const char *fstype, struc
/* Try to load the respective module. */
*error = kern_kldload(td, fstype, &fileid);
+ loaded = (*error == 0);
+ if (*error == EEXIST)
+ *error = 0;
if (*error)
return (NULL);
/* Look up again to see if the VFS was loaded. */
vfsp = vfs_byname(fstype);
if (vfsp == NULL) {
- (void)kern_kldunload(td, fileid, LINKER_UNLOAD_FORCE);
+ if (loaded)
+ (void)kern_kldunload(td, fileid, LINKER_UNLOAD_FORCE);
*error = ENODEV;
return (NULL);
}
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