Michael S. Tsirkin e716953071
ptr_ring: fix race conditions when resizing ...
Resizing currently drops consumer lock. This can cause entries to be
reordered, which isn't good in itself. More importantly, consumer can
detect a false ring empty condition and block forever.
Further, nesting of consumer within producer lock is problematic for
tun, since it produces entries in a BH, which causes a lock order
reversal:
CPU0 CPU1
---- ----
consume:
lock(&(&r->consumer_lock)->rlock);
resize:
local_irq_disable();
lock(&(&r->producer_lock)->rlock);
lock(&(&r->consumer_lock)->rlock);
<Interrupt>
produce:
lock(&(&r->producer_lock)->rlock);
To fix, nest producer lock within consumer lock during resize,
and keep consumer lock during the whole swap operation.
Reported-by: Dmitry Vyukov <dvyukov@google.com >
Cc: stable@vger.kernel.org
Cc: "David S. Miller" <davem@davemloft.net >
Acked-by: Jason Wang <jasowang@redhat.com >
Signed-off-by: Michael S. Tsirkin <mst@redhat.com >
Signed-off-by: David S. Miller <davem@davemloft.net >
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