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ibmvnic: Do not attempt to login if RX or TX queues are not allocated

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If a device reset fails for some reason, TX and RX queue resources
could be released. If a user attempts to open the device in this scenario,
it may result in a kernel panic as the driver tries to access this
memory. To fix this, include a check before device login that TX/RX
queues are still there before enabling the device. In addition, return a
value that can be checked in case of any errors to avoid waiting for a
completion that will never come.

Signed-off-by: Thomas Falcon <tlfalcon@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Falcon 2018-02-26 18:10:59 -06:00 committed by David S. Miller
parent 0aecb13ce3
commit 20a8ab744f
1 changed files with 15 additions and 6 deletions
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21
drivers/net/ethernet/ibm/ibmvnic.c
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@ -111,7 +111,7 @@ static int ibmvnic_poll(struct napi_struct *napi, int data);
static void send_map_query(struct ibmvnic_adapter *adapter);
static void send_request_map(struct ibmvnic_adapter *, dma_addr_t, __be32, u8);
static void send_request_unmap(struct ibmvnic_adapter *, u8);
static void send_login(struct ibmvnic_adapter *adapter);
static int send_login(struct ibmvnic_adapter *adapter);
static void send_cap_queries(struct ibmvnic_adapter *adapter);
static int init_sub_crqs(struct ibmvnic_adapter *);
static int init_sub_crq_irqs(struct ibmvnic_adapter *adapter);
@ -809,8 +809,11 @@ static int ibmvnic_login(struct net_device *netdev)
}
reinit_completion(&adapter->init_done);
send_login(adapter);
if (!wait_for_completion_timeout(&adapter->init_done,
rc = send_login(adapter);
if (rc) {
dev_err(dev, "Unable to attempt device login\n");
return rc;
} else if (!wait_for_completion_timeout(&adapter->init_done,
timeout)) {
dev_err(dev, "Login timeout\n");
return -1;
@ -3074,7 +3077,7 @@ static void vnic_add_client_data(struct ibmvnic_adapter *adapter,
strncpy(&vlcd->name, adapter->netdev->name, len);
}
static void send_login(struct ibmvnic_adapter *adapter)
static int send_login(struct ibmvnic_adapter *adapter)
{
struct ibmvnic_login_rsp_buffer *login_rsp_buffer;
struct ibmvnic_login_buffer *login_buffer;
@ -3090,6 +3093,12 @@ static void send_login(struct ibmvnic_adapter *adapter)
struct vnic_login_client_data *vlcd;
int i;
if (!adapter->tx_scrq || !adapter->rx_scrq) {
netdev_err(adapter->netdev,
"RX or TX queues are not allocated, device login failed\n");
return -1;
}
release_login_rsp_buffer(adapter);
client_data_len = vnic_client_data_len(adapter);
@ -3187,7 +3196,7 @@ static void send_login(struct ibmvnic_adapter *adapter)
crq.login.len = cpu_to_be32(buffer_size);
ibmvnic_send_crq(adapter, &crq);
return;
return 0;
buf_rsp_map_failed:
kfree(login_rsp_buffer);
@ -3196,7 +3205,7 @@ buf_rsp_alloc_failed:
buf_map_failed:
kfree(login_buffer);
buf_alloc_failed:
return;
return -1;
}
static void send_request_map(struct ibmvnic_adapter *adapter, dma_addr_t addr,