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authorJ. Bruce Fields <bfields@redhat.com>2012-08-17 17:31:53 -0400
committerJ. Bruce Fields <bfields@redhat.com>2012-08-20 18:39:19 -0400
commitd10f27a750312ed5638c876e4bd6aa83664cccd8 (patch)
tree9d6c68a078bc5129080177829d531d2686ea4e2a /fs
parentf06f00a24d76e168ecb38d352126fd203937b601 (diff)
downloadop-kernel-dev-d10f27a750312ed5638c876e4bd6aa83664cccd8.zip
op-kernel-dev-d10f27a750312ed5638c876e4bd6aa83664cccd8.tar.gz
svcrpc: fix svc_xprt_enqueue/svc_recv busy-looping
The rpc server tries to ensure that there will be room to send a reply before it receives a request. It does this by tracking, in xpt_reserved, an upper bound on the total size of the replies that is has already committed to for the socket. Currently it is adding in the estimate for a new reply *before* it checks whether there is space available. If it finds that there is not space, it then subtracts the estimate back out. This may lead the subsequent svc_xprt_enqueue to decide that there is space after all. The results is a svc_recv() that will repeatedly return -EAGAIN, causing server threads to loop without doing any actual work. Cc: stable@vger.kernel.org Reported-by: Michael Tokarev <mjt@tls.msk.ru> Tested-by: Michael Tokarev <mjt@tls.msk.ru> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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