Return false from can_receive() when the FIFO doesn't have a free RX
slot. This fixes a bug in the current code where the allocated buffer
is freed before the fifo pop, triggering a premature flush of queued RX
packets. It also will handle a corner case, where the guest manually
frees the allocated buffer before popping the rx FIFO (hence it is not
enough to just delay the flush_queued_packets()).
Reported-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Peter Crosthwaite <crosthwaite.peter@gmail.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Tested-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Message-id:
97bfdfc5cbce0bd5e0cbbbff35ce7a1bf6f8603d.
1441873621.git.crosthwaite.peter@gmail.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
if ((s->rcr & RCR_RXEN) == 0 || (s->rcr & RCR_SOFT_RST)) {
return 1;
}
- if (s->allocated == (1 << NUM_PACKETS) - 1) {
+ if (s->allocated == (1 << NUM_PACKETS) - 1 ||
+ s->rx_fifo_len == NUM_PACKETS) {
return 0;
}
return 1;
} else {
s->int_level &= ~INT_RCV;
}
+ smc91c111_flush_queued_packets(s);
smc91c111_update(s);
}