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SUNRPC: Fix a backchannel race

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We need to allow the server to send a new request immediately after we've
replied to the previous one. Right now, there is a window between the
send and the release of the old request in rpc_put_task(), where the
server could send us a new backchannel RPC call, and we have no
request to service it.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust
2015-06-04 15:37:10 -04:00
parent 1dddda86c0
commit 0d2a970d0a
3 changed files with 31 additions and 15 deletions
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3
include/linux/sunrpc/xprt.h
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@@ -212,7 +212,8 @@ struct rpc_xprt {
#if defined(CONFIG_SUNRPC_BACKCHANNEL)
struct svc_serv *bc_serv; /* The RPC service which will */
/* process the callback */
unsigned int bc_alloc_count; /* Total number of preallocs */
int bc_alloc_count; /* Total number of preallocs */
atomic_t bc_free_slots;
spinlock_t bc_pa_lock; /* Protects the preallocated
* items */
struct list_head bc_pa_list; /* List of preallocated