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staging: lustre: statahead: ll_intent_drop_lock() called in spinlock

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ll_intent_drop_lock() may sleep, which should not be called inside
spinlock.

Signed-off-by: Lai Siyao <lai.siyao@intel.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-2272
Reviewed-on: http://review.whamcloud.com/9665
Reviewed-by: Fan Yong <fan.yong@intel.com>
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lai Siyao 2016-09-18 16:37:56 -04:00 committed by Greg Kroah-Hartman
parent e554fbfffc
commit 6535a7d046
1 changed files with 17 additions and 7 deletions
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24
drivers/staging/lustre/lustre/llite/statahead.c
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@ -661,6 +661,7 @@ static int ll_statahead_interpret(struct ptlrpc_request *req,
struct ll_inode_info *lli = ll_i2info(dir);
struct ll_statahead_info *sai = lli->lli_sai;
struct sa_entry *entry = (struct sa_entry *)minfo->mi_cbdata;
__u64 handle = 0;
bool wakeup;
if (it_disposition(it, DISP_LOOKUP_NEG))
@ -677,6 +678,21 @@ static int ll_statahead_interpret(struct ptlrpc_request *req,
CDEBUG(D_READA, "sa_entry %.*s rc %d\n",
entry->se_qstr.len, entry->se_qstr.name, rc);
if (rc) {
ll_intent_release(it);
iput(dir);
kfree(minfo);
} else {
/*
* release ibits lock ASAP to avoid deadlock when statahead
* thread enqueues lock on parent in readdir and another
* process enqueues lock on child with parent lock held, eg.
* unlink.
*/
handle = it->it_lock_handle;
ll_intent_drop_lock(it);
}
spin_lock(&lli->lli_sa_lock);
if (rc) {
wakeup = __sa_make_ready(sai, entry, rc);
@ -689,8 +705,7 @@ static int ll_statahead_interpret(struct ptlrpc_request *req,
* for readpage and other tries to enqueue lock on child
* with parent's lock held, for example: unlink.
*/
entry->se_handle = it->it_lock_handle;
ll_intent_drop_lock(it);
entry->se_handle = handle;
wakeup = !sa_has_callback(sai);
list_add_tail(&entry->se_list, &sai->sai_interim_entries);
}
@ -700,11 +715,6 @@ static int ll_statahead_interpret(struct ptlrpc_request *req,
wake_up(&sai->sai_thread.t_ctl_waitq);
spin_unlock(&lli->lli_sa_lock);
if (rc) {
ll_intent_release(it);
iput(dir);
kfree(minfo);
}
return rc;
}