diff options
| author | Julian Wiedmann <jwi@linux.ibm.com> | 2020-07-30 17:01:18 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-07-31 16:44:35 -0700 |
| commit | eff73e16ee116f6eafa2be48fab42659a27cb453 (patch) | |
| tree | a12758ac0c378210996364775eb5d1a7a90eb3c1 /drivers/s390/net | |
| parent | 9fc95f50eedb5cfe5d53a9c970c47ed680fc4e54 (diff) | |
s390/qeth: tolerate pre-filled RX buffer
When preparing a buffer for RX refill, tolerate that it already has a
pool_entry attached. Otherwise we could easily leak such a pool_entry
when re-driving the RX refill after an error (from eg. do_qdio()).
This needs some minor adjustment in the code that drains RX buffer(s)
prior to RX refill and during teardown, so that ->pool_entry is NULLed
accordingly.
Fixes: 4a71df50047f ("qeth: new qeth device driver")
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/s390/net')
| -rw-r--r-- | drivers/s390/net/qeth_core_main.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c index 8a76022fceda..b356ee5de9f8 100644 --- a/drivers/s390/net/qeth_core_main.c +++ b/drivers/s390/net/qeth_core_main.c @@ -204,12 +204,17 @@ EXPORT_SYMBOL_GPL(qeth_threads_running); void qeth_clear_working_pool_list(struct qeth_card *card) { struct qeth_buffer_pool_entry *pool_entry, *tmp; + struct qeth_qdio_q *queue = card->qdio.in_q; + unsigned int i; QETH_CARD_TEXT(card, 5, "clwrklst"); list_for_each_entry_safe(pool_entry, tmp, &card->qdio.in_buf_pool.entry_list, list){ list_del(&pool_entry->list); } + + for (i = 0; i < ARRAY_SIZE(queue->bufs); i++) + queue->bufs[i].pool_entry = NULL; } EXPORT_SYMBOL_GPL(qeth_clear_working_pool_list); @@ -2965,7 +2970,7 @@ static struct qeth_buffer_pool_entry *qeth_find_free_buffer_pool_entry( static int qeth_init_input_buffer(struct qeth_card *card, struct qeth_qdio_buffer *buf) { - struct qeth_buffer_pool_entry *pool_entry; + struct qeth_buffer_pool_entry *pool_entry = buf->pool_entry; int i; if ((card->options.cq == QETH_CQ_ENABLED) && (!buf->rx_skb)) { @@ -2976,9 +2981,13 @@ static int qeth_init_input_buffer(struct qeth_card *card, return -ENOMEM; } - pool_entry = qeth_find_free_buffer_pool_entry(card); - if (!pool_entry) - return -ENOBUFS; + if (!pool_entry) { + pool_entry = qeth_find_free_buffer_pool_entry(card); + if (!pool_entry) + return -ENOBUFS; + + buf->pool_entry = pool_entry; + } /* * since the buffer is accessed only from the input_tasklet @@ -2986,8 +2995,6 @@ static int qeth_init_input_buffer(struct qeth_card *card, * the QETH_IN_BUF_REQUEUE_THRESHOLD we should never run out off * buffers */ - - buf->pool_entry = pool_entry; for (i = 0; i < QETH_MAX_BUFFER_ELEMENTS(card); ++i) { buf->buffer->element[i].length = PAGE_SIZE; buf->buffer->element[i].addr = @@ -5771,6 +5778,7 @@ static unsigned int qeth_rx_poll(struct qeth_card *card, int budget) if (done) { QETH_CARD_STAT_INC(card, rx_bufs); qeth_put_buffer_pool_entry(card, buffer->pool_entry); + buffer->pool_entry = NULL; qeth_queue_input_buffer(card, card->rx.b_index); card->rx.b_count--; |