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(parent: d528114) | patch
s390/qeth: fix race in used-buffer accounting
authorJulian Wiedmann <jwi@linux.ibm.com>
Thu, 19 Jul 2018 10:43:48 +0000 (12:43 +0200)
committerDavid S. Miller <davem@davemloft.net>
Sat, 21 Jul 2018 17:12:29 +0000 (10:12 -0700)
commita702349a4099cd5a7bab0904689d8e0bf8dcd622
tree9c4fecc85ff313af8459d3181fedf830d9962114tree | snapshot
parentd528114bd398b4edaeed370a96f874dff88c10f5commit | diff
s390/qeth: fix race in used-buffer accounting

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>
drivers/s390/net/qeth_core_main.c diff | blob | history
Domain: System / Kernel;