tree efa404f6ebfcdca077aedf2b5c5eba7c68b6f049
parent 882dcfe5a1785c20f45820cbe6fec4b8b647c946
author Karsten Graul <kgraul@linux.ibm.com> 1570695371 +0200
committer Jakub Kicinski <jakub.kicinski@netronome.com> 1570759721 -0700

net/smc: receive pending data after RCV_SHUTDOWN

smc_rx_recvmsg() first checks if data is available, and then if
RCV_SHUTDOWN is set. There is a race when smc_cdc_msg_recv_action() runs
in between these 2 checks, receives data and sets RCV_SHUTDOWN.
In that case smc_rx_recvmsg() would return from receive without to
process the available data.
Fix that with a final check for data available if RCV_SHUTDOWN is set.
Move the check for data into a function and call it twice.
And use the existing helper smc_rx_data_available().

Fixes: 952310ccf2d8 ("smc: receive data from RMBE")
Reviewed-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>