af_iucv: block writing if msg limit is exceeded
When polling on an AF_IUCV socket, writing should be blocked if the number of pending messages exceeds a defined limit. Signed-off-by: NUrsula Braun <ursula.braun@de.ibm.com> Signed-off-by: NFrank Blaschka <frank.blaschka@de.ibm.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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