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af_packet: block BH in prb_shutdown_retire_blk_timer()
Currently we're using plain spin_lock() in prb_shutdown_retire_blk_timer(), however the timer might fire right in the middle and thus try to re-aquire the same spinlock, leaving us in a endless loop. To fix that, use the spin_lock_bh() to block it. Fixes: f6fb8f1 ("af-packet: TPACKET_V3 flexible buffer implementation.") CC: "David S. Miller" <[email protected]> CC: Daniel Borkmann <[email protected]> CC: Willem de Bruijn <[email protected]> CC: Phil Sutter <[email protected]> CC: Eric Dumazet <[email protected]> Reported-by: Jan Stancek <[email protected]> Tested-by: Jan Stancek <[email protected]> Signed-off-by: Veaceslav Falico <[email protected]> Acked-by: Daniel Borkmann <[email protected]> Signed-off-by: David S. Miller <[email protected]>
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