net: handle NULL ->poll gracefully
The big aio poll revert broke various network protocols that don't implement ->poll as a patch in the aio poll serie removed sock_no_poll and made the common code handle this case. Reported-by: syzbot+57727883dbad76db2ef0@syzkaller.appspotmail.com Reported-by: syzbot+cdb0d3176b53d35ad454@syzkaller.appspotmail.com Reported-by: syzbot+2c7e8f74f8b2571c87e8@syzkaller.appspotmail.com Reported-by: NTetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> Fixes: a11e1d43 ("Revert changes to convert to ->poll_mask() and aio IOCB_CMD_POLL") Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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