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authorSowmini Varadhan <sowmini.varadhan@oracle.com>2015-02-10 19:33:37 +0100
committerDavid S. Miller <davem@davemloft.net>2015-02-11 23:35:44 +0100
commit80ad0d4a7a75158f2824d541e4802c88aba4f063 (patch)
tree551dd5acb605a09883085f783fb1513d1012bf74 /CREDITS
parentipv6: Partial checksum only UDP packets (diff)
downloadlinux-80ad0d4a7a75158f2824d541e4802c88aba4f063.tar.xz
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rds: rds_cong_queue_updates needs to defer the congestion update transmission
When the RDS transport is TCP, we cannot inline the call to rds_send_xmit from rds_cong_queue_update because (a) we are already holding the sock_lock in the recv path, and will deadlock when tcp_setsockopt/tcp_sendmsg try to get the sock lock (b) cong_queue_update does an irqsave on the rds_cong_lock, and this will trigger warnings (for a good reason) from functions called out of sock_lock. This patch reverts the change introduced by 2fa57129d ("RDS: Bypass workqueue when queueing cong updates"). The patch has been verified for both RDS/TCP as well as RDS/RDMA to ensure that there are not regressions for either transport: - for verification of RDS/TCP a client-server unit-test was used, with the server blocked in gdb and thus unable to drain its rcvbuf, eventually triggering a RDS congestion update. - for RDS/RDMA, the standard IB regression tests were used Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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