libceph: don't bail early from try_read() when skipping a message

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commit e7a88e82fe upstream.

The contract between try_read() and try_write() is that when called
each processes as much data as possible.  When instructed by osd_client
to skip a message, try_read() is violating this contract by returning
after receiving and discarding a single message instead of checking for
more.  try_write() then gets a chance to write out more requests,
generating more replies/skips for try_read() to handle, forcing the
messenger into a starvation loop.

Reported-by: Varada Kari <Varada.Kari@sandisk.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Tested-by: Varada Kari <Varada.Kari@sandisk.com>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Ilya Dryomov 2016-02-17 20:04:08 +01:00 • committed by Greg Kroah-Hartman

parent ee83447380

commit 50c6a283a7

1 changed files with 2 additions and 2 deletions

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net/ceph/messenger.c

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