s390/qeth: fix race in used-buffer accounting

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By updating q->used_buffers only _after_ do_QDIO() has completed, there
is a potential race against the buffer's TX completion. In the unlikely
case that the TX completion path wins, qeth_qdio_output_handler() would
decrement the counter before qeth_flush_buffers() even incremented it.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Julian Wiedmann 2018-07-19 12:43:48 +02:00 • committed by David S. Miller

parent d528114bd3

commit a702349a40

1 changed files with 2 additions and 1 deletions

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drivers/s390/net/qeth_core_main.c

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