Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=905f8d16e32fd48499e3f8b9a2d9f746af3e0949
Commit: 905f8d16e32fd48499e3f8b9a2d9f746af3e0949
Parent: 45328c354e8ae16b67cb3adb72ab57459f9e5fd6
Author: Trond Myklebust <[EMAIL PROTECTED]>
AuthorDate: Mon Aug 6 12:18:34 2007 -0400
Committer: Trond Myklebust <[EMAIL PROTECTED]>
CommitDate: Tue Aug 7 15:15:57 2007 -0400
NFSv4: Don't call put_rpccred() from an rcu callback
Doing so would require us to introduce bh-safe locks into put_rpccred().
This patch fixes the lockdep complaint reported by Marc Dietrich:
inconsistent {softirq-on-W} -> {in-softirq-W} usage.
swapper/0 [HC0[0]:SC1[1]:HE1:SE0] takes:
(rpc_credcache_lock){-+..}, at: [<c01dc487>]
_atomic_dec_and_lock+0x17/0x60
{softirq-on-W} state was registered at:
[<c013e870>] __lock_acquire+0x650/0x1030
[<c013f2b1>] lock_acquire+0x61/0x80
[<c02db9ac>] _spin_lock+0x2c/0x40
[<c01dc487>] _atomic_dec_and_lock+0x17/0x60
[<dced55fd>] put_rpccred+0x5d/0x100 [sunrpc]
[<dced56c1>] rpcauth_unbindcred+0x21/0x60 [sunrpc]
[<dced3fd4>] a0 [sunrpc]
[<dcecefe0>] rpc_call_sync+0x30/0x40 [sunrpc]
[<dcedc73b>] rpcb_register+0xdb/0x180 [sunrpc]
[<dced65b3>] svc_register+0x93/0x160 [sunrpc]
[<dced6ebe>] __svc_create+0x1ee/0x220 [sunrpc]
[<dced7053>] svc_create+0x13/0x20 [sunrpc]
[<dcf6d722>] nfs_callback_up+0x82/0x120 [nfs]
[<dcf48f36>] nfs_get_client+0x176/0x390 [nfs]
[<dcf49181>] nfs4_set_client+0x31/0x190 [nfs]
[<dcf49983>] nfs4_create_server+0x63/0x3b0 [nfs]
[<dcf52426>] nfs4_get_sb+0x346/0x5b0 [nfs]
[<c017b444>] vfs_kern_mount+0x94/0x110
[<c0190a62>] do_mount+0x1f2/0x7d0
[<c01910a6>] sys_mount+0x66/0xa0
[<c0104046>] syscall_call+0x7/0xb
[<ffffffff>] 0xffffffff
irq event stamp: 5277830
hardirqs last enabled at (5277830): [<c017530a>] kmem_cache_free+0x8a/0xc0
hardirqs last disabled at (5277829): [<c01752d2>] kmem_cache_free+0x52/0xc0
softirqs last enabled at (5277798): [<c0124173>] __do_softirq+0xa3/0xc0
softirqs last disabled at (5277817): [<c01241d7>] do_softirq+0x47/0x50
other info that might help us debug this:
no locks held by swapper/0.
stack backtrace:
[<c0104fda>] show_trace_log_lvl+0x1a/0x30
[<c0105c02>] show_trace+0x12/0x20
[<c0105d15>] dump_stack+0x15/0x20
[<c013ccc3>] print_usage_bug+0x153/0x160
[<c013d8b9>] mark_lock+0x449/0x620
[<c013e824>] __lock_acquire+0x604/0x1030
[<c013f2b1>] lock_acquire+0x61/0x80
[<c02db9ac>] _spin_lock+0x2c/0x40
[<c01dc487>] _atomic_dec_and_lock+0x17/0x60
[<dced55fd>] put_rpccred+0x5d/0x100 [sunrpc]
[<dcf6bf83>] nfs_free_delegation_callback+0x13/0x20 [nfs]
[<c012f9ea>] __rcu_process_callbacks+0x6a/0x1c0
[<c012fb52>] rcu_process_callbacks+0x12/0x30
[<c0124218>] tasklet_action+0x38/0x80
[<c0124125>] __do_softirq+0x55/0xc0
[<c01241d7>] do_softirq+0x47/0x50
[<c0124605>] irq_exit+0x35/0x40
[<c0112463>] smp_apic_timer_interrupt+0x43/0x80
[<c0104a77>] apic_timer_interrupt+0x33/0x38
[<c02690df>] cpuidle_idle_call+0x6f/0x90
[<c01023c3>] cpu_idle+0x43/0x70
[<c02d8c27>] rest_init+0x47/0x50
[<c03bcb6a>] start_kernel+0x22a/0x2b0
[<00000000>] 0x0
=======================
Signed-off-by: Trond Myklebust <[EMAIL PROTECTED]>
---
fs/nfs/delegation.c | 21 +++++++++++++++------
1 files changed, 15 insertions(+), 6 deletions(-)
diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c
index 20ac403..c55a761 100644
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -20,10 +20,8 @@
#include "delegation.h"
#include "internal.h"
-static void nfs_free_delegation(struct nfs_delegation *delegation)
+static void nfs_do_free_delegation(struct nfs_delegation *delegation)
{
- if (delegation->cred)
- put_rpccred(delegation->cred);
kfree(delegation);
}
@@ -31,7 +29,18 @@ static void nfs_free_delegation_callback(struct rcu_head
*head)
{
struct nfs_delegation *delegation = container_of(head, struct
nfs_delegation, rcu);
- nfs_free_delegation(delegation);
+ nfs_do_free_delegation(delegation);
+}
+
+static void nfs_free_delegation(struct nfs_delegation *delegation)
+{
+ struct rpc_cred *cred;
+
+ cred = rcu_dereference(delegation->cred);
+ rcu_assign_pointer(delegation->cred, NULL);
+ call_rcu(&delegation->rcu, nfs_free_delegation_callback);
+ if (cred)
+ put_rpccred(cred);
}
static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct
nfs4_state *state)
@@ -166,7 +175,7 @@ static int nfs_do_return_delegation(struct inode *inode,
struct nfs_delegation *
int res = 0;
res = nfs4_proc_delegreturn(inode, delegation->cred,
&delegation->stateid);
- call_rcu(&delegation->rcu, nfs_free_delegation_callback);
+ nfs_free_delegation(delegation);
return res;
}
@@ -448,7 +457,7 @@ restart:
spin_unlock(&clp->cl_lock);
rcu_read_unlock();
if (delegation != NULL)
- call_rcu(&delegation->rcu,
nfs_free_delegation_callback);
+ nfs_free_delegation(delegation);
goto restart;
}
rcu_read_unlock();
-
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