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authorNathaniel Wesley Filardo <nwf@cs.jhu.edu>2014-05-21 14:58:26 +0100
committerDavid Howells <dhowells@redhat.com>2014-05-23 13:05:22 +0100
commit150a6b478982475c60fa25b7060ab990ece5483d (patch)
treee9dacc67a8091709971041578ecc1bed3141ba76 /fs
parent6cf12869f5c1a837f18af5f8b2308fa243772735 (diff)
AFS: Fix kafs module unloading
At present, it is not possible to successfully unload the kafs module if there are outstanding async outgoing calls (those made with afs_make_call()). This appears to be due to the changes introduced by: commit 059499453a9abd1857d442b44da8b4c126dc72a8 Author: Tejun Heo <tj@kernel.org> Date: Fri Mar 7 10:24:50 2014 -0500 Subject: afs: don't use PREPARE_WORK which didn't go far enough. The problem is due to: (1) The aforementioned commit introduced a separate handler function pointer in the call, call->async_workfn, in addition to the original workqueue item, call->async_work, for asynchronous operations because workqueues subsystem cannot handle the workqueue item pointer being changed whilst the item is queued or being processed. (2) afs_async_workfn() was introduced in that commit to be the callback for call->async_work. Its sole purpose is to run whatever call->async_workfn points to. (3) call->async_workfn is only used from afs_async_workfn(), which is only set on async_work by afs_collect_incoming_call() - ie. for incoming calls. (4) call->async_workfn is *not* set by afs_make_call() when outgoing calls are made, and call->async_work is set afs_process_async_call() - and not afs_async_workfn(). (5) afs_process_async_call() now changes call->async_workfn rather than call->async_work to point to afs_delete_async_call() to clean up, but this is only effective for incoming calls because call->async_work does not point to afs_async_workfn() for outgoing calls. (6) Because, for incoming calls, call->async_work remains pointing to afs_process_async_call() this results in an infinite loop. Instead, make the workqueue uniformly vector through call->async_workfn, via afs_async_workfn() and simply initialise call->async_workfn to point to afs_process_async_call() in afs_make_call(). Signed-off-by: Nathaniel Wesley Filardo <nwf@cs.jhu.edu> Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/afs/rxrpc.c17
1 files changed, 9 insertions, 8 deletions
diff --git a/fs/afs/rxrpc.c b/fs/afs/rxrpc.c
index 1a1110b1a7ff..5a05014ea7b0 100644
--- a/fs/afs/rxrpc.c
+++ b/fs/afs/rxrpc.c
@@ -58,6 +58,13 @@ static void afs_collect_incoming_call(struct work_struct *);
static struct sk_buff_head afs_incoming_calls;
static DECLARE_WORK(afs_collect_incoming_call_work, afs_collect_incoming_call);
+static void afs_async_workfn(struct work_struct *work)
+{
+ struct afs_call *call = container_of(work, struct afs_call, async_work);
+
+ call->async_workfn(work);
+}
+
/*
* open an RxRPC socket and bind it to be a server for callback notifications
* - the socket is left in blocking mode and non-blocking ops use MSG_DONTWAIT
@@ -348,7 +355,8 @@ int afs_make_call(struct in_addr *addr, struct afs_call *call, gfp_t gfp,
atomic_read(&afs_outstanding_calls));
call->wait_mode = wait_mode;
- INIT_WORK(&call->async_work, afs_process_async_call);
+ call->async_workfn = afs_process_async_call;
+ INIT_WORK(&call->async_work, afs_async_workfn);
memset(&srx, 0, sizeof(srx));
srx.srx_family = AF_RXRPC;
@@ -672,13 +680,6 @@ void afs_transfer_reply(struct afs_call *call, struct sk_buff *skb)
call->reply_size += len;
}
-static void afs_async_workfn(struct work_struct *work)
-{
- struct afs_call *call = container_of(work, struct afs_call, async_work);
-
- call->async_workfn(work);
-}
-
/*
* accept the backlog of incoming calls
*/