Messages in this thread Patch in this message | | | From | Sowmini Varadhan <> | Subject | [PATCH 3/6] rds: check for excessive looping in rds_send_xmit | Date | Thu, 2 Apr 2015 09:50:46 -0400 |
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Original patch by Andy Grover
Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com> --- net/rds/send.c | 13 +++++++++++++ 1 files changed, 13 insertions(+), 0 deletions(-)
diff --git a/net/rds/send.c b/net/rds/send.c index 44672be..b1741a2 100644 --- a/net/rds/send.c +++ b/net/rds/send.c @@ -140,6 +140,7 @@ int rds_send_xmit(struct rds_connection *conn) struct scatterlist *sg; int ret = 0; LIST_HEAD(to_be_dropped); + int same_rm = 0; restart: @@ -177,6 +178,18 @@ int rds_send_xmit(struct rds_connection *conn) rm = conn->c_xmit_rm; + if (!rm) { + same_rm = 0; + } else { + same_rm++; + if (same_rm >= 4096) { + printk_ratelimited(KERN_ERR "RDS: Stuck rm\n"); + cond_resched(); + ret = -EAGAIN; + break; + } + } + /* * If between sending messages, we can send a pending congestion * map update. -- 1.7.1
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