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s390/qeth: allocate a single cmd on read channel

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We statically allocate 8 cmd buffers on the read channel, when the only
IO left that's still using them is the long-running READ.
Replace this with a single allocated cmd, that gets restarted whenever
the READ completed.

This introduces refcounting for allocated cmds, so that the READ cmd can
survive the IO completion.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Julian Wiedmann
2019-06-11 18:38:00 +02:00
committed by David S. Miller
parent f3b783b1d0
commit d9b9f40bba
4 changed files with 39 additions and 24 deletions
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drivers/s390/net/qeth_l2_main.c
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@@ -292,7 +292,6 @@ static void qeth_l2_stop_card(struct qeth_card *card)
card->state = CARD_STATE_DOWN;
}
qeth_clear_cmd_buffers(&card->read);
qeth_clear_cmd_buffers(&card->write);
flush_workqueue(card->event_wq);
card->info.mac_bits &= ~QETH_LAYER2_MAC_REGISTERED;