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authorTrond Myklebust <Trond.Myklebust@netapp.com>2013-01-04 12:47:04 -0500
committerTrond Myklebust <Trond.Myklebust@netapp.com>2013-01-04 12:59:10 -0500
commit6db6dd7d3fd8f7c765dabc376493d6791ab28bd6 (patch)
tree3328dca5352ad54f3d12d484ee5742a9a5b67542 /fs/nfs
parentc6567ed1402c55e19b012e66a8398baec2a726f3 (diff)
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: Trond 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]
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/read.c10
-rw-r--r--fs/nfs/write.c10
2 files changed, 14 insertions, 6 deletions
diff --git a/fs/nfs/read.c b/fs/nfs/read.c
index b6bdb18e892..a5e5d9899d5 100644
--- a/fs/nfs/read.c
+++ b/fs/nfs/read.c
@@ -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);
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index b673be31590..c483cc50b82 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -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);