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NFS: Replace flush_scheduled_work with cancel_work_sync() and friends 

This will avoid deadlocks of the form:

stack backtrace:
 [<c0104fda>] show_trace_log_lvl+0x1a/0x30
 [<c0105c02>] show_trace+0x12/0x20
 [<c0105d15>] dump_stack+0x15/0x20
 [<c013ee42>] __lock_acquire+0xc22/0x1030
 [<c013f2b1>] lock_acquire+0x61/0x80
 [<c012edd9>] flush_workqueue+0x49/0x70
 [<c012ee0d>] flush_scheduled_work+0xd/0x10
 [<dcf55c0c>] nfs_release_automount_timer+0x2c/0x30 [nfs]
 [<dcf45d8e>] nfs_free_server+0x9e/0xd0 [nfs]
 [<dcf4e626>] nfs_kill_super+0x16/0x20 [nfs]
 [<c017b38d>] deactivate_super+0x7d/0xa0
 [<c018f94b>] mntput_no_expire+0x4b/0x80
 [<c018fd94>] expire_mount_list+0xe4/0x140
 [<c0191219>] mark_mounts_for_expiry+0x99/0xb0
 [<dcf55d1d>] nfs_expire_automounts+0xd/0x40 [nfs]
 [<c012e61b>] run_workqueue+0x12b/0x1e0
 [<c012f05b>] worker_thread+0x9b/0x100
 [<c0131c72>] kthread+0x42/0x70
 [<c0104c0f>] kernel_thread_helper+0x7/0x18
 =======================

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2007-08-07 15:28:33 -04:00
parent a4deb81ba8
commit 3d39c691ff
2 changed files with 4 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
fs/nfs/namespace.c
View File

@ -175,10 +175,8 @@ static void nfs_expire_automounts(struct work_struct *work)
void nfs_release_automount_timer(void)
{
if (list_empty(&nfs_automount_list)) {
cancel_delayed_work(&nfs_automount_task);
flush_scheduled_work();
}
if (list_empty(&nfs_automount_list))
cancel_delayed_work_sync(&nfs_automount_task);
}
/*

5
fs/nfs/nfs4renewd.c
View File

@ -127,16 +127,15 @@ nfs4_schedule_state_renewal(struct nfs_client *clp)
void
nfs4_renewd_prepare_shutdown(struct nfs_server *server)
{
flush_scheduled_work();
cancel_delayed_work(&server->nfs_client->cl_renewd);
}
void
nfs4_kill_renewd(struct nfs_client *clp)
{
down_read(&clp->cl_sem);
cancel_delayed_work(&clp->cl_renewd);
cancel_delayed_work_sync(&clp->cl_renewd);
up_read(&clp->cl_sem);
flush_scheduled_work();
}
/*