diff options
| author | Sukadev Bhattiprolu <sukadev@linux.ibm.com> | 2020-11-25 18:04:29 -0600 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2020-11-28 13:26:48 -0800 |
| commit | 76cdc5c5d99ce4856ad0ac38facc33b52fa64f77 (patch) | |
| tree | 91d4c4e7920964ac7c4afa7f31c9f288132182d5 /drivers/net/ethernet/ibm/ibmvnic.c | |
| parent | f15fde9d47b887b406f5e76490d601cfc26643c9 (diff) | |
ibmvnic: track pending login
If after ibmvnic sends a LOGIN it gets a FAILOVER, it is possible that
the worker thread will start reset process and free the login response
buffer before it gets a (now stale) LOGIN_RSP. The ibmvnic tasklet will
then try to access the login response buffer and crash.
Have ibmvnic track pending logins and discard any stale login responses.
Fixes: 032c5e82847a ("Driver for IBM System i/p VNIC protocol")
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.ibm.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers/net/ethernet/ibm/ibmvnic.c')
| -rw-r--r-- | drivers/net/ethernet/ibm/ibmvnic.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c index d4d40b349788..13eae1666477 100644 --- a/drivers/net/ethernet/ibm/ibmvnic.c +++ b/drivers/net/ethernet/ibm/ibmvnic.c @@ -3841,6 +3841,8 @@ static int send_login(struct ibmvnic_adapter *adapter) crq.login.cmd = LOGIN; crq.login.ioba = cpu_to_be32(buffer_token); crq.login.len = cpu_to_be32(buffer_size); + + adapter->login_pending = true; ibmvnic_send_crq(adapter, &crq); return 0; @@ -4393,6 +4395,15 @@ static int handle_login_rsp(union ibmvnic_crq *login_rsp_crq, u64 *size_array; int i; + /* CHECK: Test/set of login_pending does not need to be atomic + * because only ibmvnic_tasklet tests/clears this. + */ + if (!adapter->login_pending) { + netdev_warn(netdev, "Ignoring unexpected login response\n"); + return 0; + } + adapter->login_pending = false; + dma_unmap_single(dev, adapter->login_buf_token, adapter->login_buf_sz, DMA_TO_DEVICE); dma_unmap_single(dev, adapter->login_rsp_buf_token, @@ -4764,6 +4775,11 @@ static void ibmvnic_handle_crq(union ibmvnic_crq *crq, case IBMVNIC_CRQ_INIT: dev_info(dev, "Partner initialized\n"); adapter->from_passive_init = true; + /* Discard any stale login responses from prev reset. + * CHECK: should we clear even on INIT_COMPLETE? + */ + adapter->login_pending = false; + if (!completion_done(&adapter->init_done)) { complete(&adapter->init_done); adapter->init_done_rc = -EIO; @@ -5196,6 +5212,7 @@ static int ibmvnic_probe(struct vio_dev *dev, const struct vio_device_id *id) dev_set_drvdata(&dev->dev, netdev); adapter->vdev = dev; adapter->netdev = netdev; + adapter->login_pending = false; ether_addr_copy(adapter->mac_addr, mac_addr_p); ether_addr_copy(netdev->dev_addr, adapter->mac_addr); |