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s390/qeth: make af_iucv TX notification call more robust
[ Upstream commit 34c7f50 ] Calling into socket code is ugly already, at least check whether we are dealing with the expected sk_family. Only looking at skb->protocol is bound to cause troubles (consider eg. af_packet). Fixes: b333293 ("qeth: add support for af_iucv HiperSockets transport") Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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