[PATCH net 4/7] ibmvnic: account for bufs already saved in indir_buf
From: Sukadev Bhattiprolu <hidden>
Date: 2021-06-24 04:14:02
Subsystem:
ibm power sriov virtual nic device driver, linux for powerpc (32-bit and 64-bit), networking drivers, the rest · Maintainers:
Haren Myneni, Rick Lindsley, Madhavan Srinivasan, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
This fixes a crash in replenish_rx_pool() when called from ibmvnic_poll()
after a previous call to replenish_rx_pool() encountered an error when
allocating a socket buffer.
Thanks to Rick Lindsley and Dany Madden for helping debug the crash.
Fixes: 4f0b6812e9b9 ("ibmvnic: Introduce batched RX buffer descriptor transmission")
Signed-off-by: Sukadev Bhattiprolu <redacted>
---
drivers/net/ethernet/ibm/ibmvnic.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index fa402e20c137..b1d7caaa4fb7 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c@@ -351,7 +351,14 @@ static void replenish_rx_pool(struct ibmvnic_adapter *adapter, rx_scrq = adapter->rx_scrq[pool->index]; ind_bufp = &rx_scrq->ind_buf; - for (i = 0; i < count; ++i) { + + /* netdev_skb_alloc() could have failed after we saved a few skbs + * in the indir_buf and we would not have sent them to VIOS yet. + * To account for them, start the loop at ind_bufp->index rather + * than 0. If we pushed all the skbs to VIOS, ind_bufp->index will + * be 0. + */ + for (i = ind_bufp->index; i < count; ++i) { skb = netdev_alloc_skb(adapter->netdev, pool->buff_size); if (!skb) { dev_err(dev, "Couldn't replenish rx buff\n");
--
2.31.1