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taprio: Fix allowing too small intervals
[ Upstream commit b5b73b2 ] It's possible that the user specifies an interval that couldn't allow any packet to be transmitted. This also avoids the issue of the hrtimer handler starving the other threads because it's running too often. The solution is to reject interval sizes that according to the current link speed wouldn't allow any packet to be transmitted. Reported-by: syzbot+8267241609ae8c23b248@syzkaller.appspotmail.com Fixes: 5a781cc ("tc: Add support for configuring the taprio scheduler") Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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