piaojun c290fba8c4 net/9p/client.c: put refcount of trans_mod in error case in parse_opts() ... In my testing, the second mount will fail after umounting successfully. The reason is that we put refcount of trans_mod in the correct case rather than the error case in parse_opts() at last. That will cause the refcount decrease to -1, and when we try to get trans_mod again in try_module_get(), we could only increase refcount to 0 which will cause failure as follows: parse_opts v9fs_get_trans_by_name try_module_get : return NULL to caller which cause error So we should put refcount of trans_mod in error case. Link: http://lkml.kernel.org/r/5B3F39A0.2030509@huawei.com Fixes: 9421c3e641 ("net/9p/client.c: fix potential refcnt problem of trans module") Signed-off-by: Jun Piao <piaojun@huawei.com> Reviewed-by: Yiwen Jiang <jiangyiwen@huawei.com> Reviewed-by: Greg Kurz <groug@kaod.org> Reviewed-by: Dominique Martinet <dominique.martinet@cea.fr> Tested-by: Dominique Martinet <dominique.martinet@cea.fr> Cc: Eric Van Hensbergen <ericvh@gmail.com> Cc: Ron Minnich <rminnich@sandia.gov> Cc: Latchesar Ionkov <lucho@ionkov.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2018-07-14 11:11:09 -07:00
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client.c	net/9p/client.c: put refcount of trans_mod in error case in parse_opts()	2018-07-14 11:11:09 -07:00
error.c	hlist: drop the node parameter from iterators	2013-02-27 19:10:24 -08:00
Kconfig	IB: Revert "remove redundant INFINIBAND kconfig dependencies"	2018-05-28 10:40:16 -06:00
Makefile	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
mod.c	net/9p: correct the variable name in v9fs_get_trans_by_name() comment	2018-05-07 23:38:15 -04:00
protocol.c	treewide: kmalloc() -> kmalloc_array()	2018-06-12 16:19:22 -07:00
protocol.h	net/9p: Convert net/9p protocol dumps to tracepoints	2011-10-24 11:13:12 -05:00
trans_common.c	net/9p: correct some comment errors in 9p file system code	2018-05-10 08:21:53 -04:00
trans_common.h	net/9p: remove (now-)unused helpers	2015-04-11 22:28:29 -04:00
trans_fd.c	Merge branch 'work.aio-1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2018-06-04 13:57:43 -07:00
trans_rdma.c	net/9p: correct some comment errors in 9p file system code	2018-05-10 08:21:53 -04:00
trans_virtio.c	treewide: kmalloc() -> kmalloc_array()	2018-06-12 16:19:22 -07:00
trans_xen.c	net/9p/trans_xen.c: don't inclide rwlock.h directly	2018-06-07 17:34:34 -07:00
util.c	net/9p: convert to idr_alloc()	2013-02-27 19:10:20 -08:00