提交 6db6dd7d 编写于 作者: T Trond Myklebust

NFS: Ensure that we free the rpc_task after read and write cleanups are done

This patch ensures that we free the rpc_task after the cleanup callbacks
are done in order to avoid a deadlock problem that can be triggered if
the callback needs to wait for another workqueue item to complete.
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>
Cc: Weston Andros Adamson <dros@netapp.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Bruce Fields <bfields@fieldses.org>
Cc: stable@vger.kernel.org [>= 3.5]
上级 c6567ed1
......@@ -91,12 +91,16 @@ void nfs_readdata_release(struct nfs_read_data *rdata)
put_nfs_open_context(rdata->args.context);
if (rdata->pages.pagevec != rdata->pages.page_array)
kfree(rdata->pages.pagevec);
if (rdata != &read_header->rpc_data)
kfree(rdata);
else
if (rdata == &read_header->rpc_data) {
rdata->header = NULL;
rdata = NULL;
}
if (atomic_dec_and_test(&hdr->refcnt))
hdr->completion_ops->completion(hdr);
/* Note: we only free the rpc_task after callbacks are done.
* See the comment in rpc_free_task() for why
*/
kfree(rdata);
}
EXPORT_SYMBOL_GPL(nfs_readdata_release);
......
......@@ -126,12 +126,16 @@ void nfs_writedata_release(struct nfs_write_data *wdata)
put_nfs_open_context(wdata->args.context);
if (wdata->pages.pagevec != wdata->pages.page_array)
kfree(wdata->pages.pagevec);
if (wdata != &write_header->rpc_data)
kfree(wdata);
else
if (wdata == &write_header->rpc_data) {
wdata->header = NULL;
wdata = NULL;
}
if (atomic_dec_and_test(&hdr->refcnt))
hdr->completion_ops->completion(hdr);
/* Note: we only free the rpc_task after callbacks are done.
* See the comment in rpc_free_task() for why
*/
kfree(wdata);
}
EXPORT_SYMBOL_GPL(nfs_writedata_release);
......
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