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ibmvnic: Initialize completion variables before starting work 

Initialize condition variables prior to invoking any work that can
mark them complete. This resolves a race in the ibmvnic driver where
the driver faults trying to complete an uninitialized condition
variable.

Signed-off-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nathan Fontenot 2017-02-10 13:45:05 -05:00 committed by David S. Miller
parent 1ee18329fa
commit db5d0b597b
1 changed files with 9 additions and 8 deletions
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17
drivers/net/ethernet/ibm/ibmvnic.c
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@ -189,9 +189,10 @@ static int alloc_long_term_buff(struct ibmvnic_adapter *adapter,
}
ltb->map_id = adapter->map_id;
adapter->map_id++;
init_completion(&adapter->fw_done);
send_request_map(adapter, ltb->addr,
ltb->size, ltb->map_id);
init_completion(&adapter->fw_done);
wait_for_completion(&adapter->fw_done);
return 0;
}
@ -1121,10 +1122,10 @@ static void ibmvnic_get_ethtool_stats(struct net_device *dev,
crq.request_statistics.ioba = cpu_to_be32(adapter->stats_token);
crq.request_statistics.len =
cpu_to_be32(sizeof(struct ibmvnic_statistics));
ibmvnic_send_crq(adapter, &crq);
/* Wait for data to be written */
init_completion(&adapter->stats_done);
ibmvnic_send_crq(adapter, &crq);
wait_for_completion(&adapter->stats_done);
for (i = 0; i < ARRAY_SIZE(ibmvnic_stats); i++)
@ -2799,9 +2800,9 @@ static ssize_t trace_read(struct file *file, char __user *user_buf, size_t len,
crq.collect_fw_trace.correlator = adapter->ras_comps[num].correlator;
crq.collect_fw_trace.ioba = cpu_to_be32(trace_tok);
crq.collect_fw_trace.len = adapter->ras_comps[num].trace_buff_size;
ibmvnic_send_crq(adapter, &crq);
init_completion(&adapter->fw_done);
ibmvnic_send_crq(adapter, &crq);
wait_for_completion(&adapter->fw_done);
if (*ppos + len > be32_to_cpu(adapter->ras_comps[num].trace_buff_size))
@ -3581,9 +3582,9 @@ static int ibmvnic_dump_show(struct seq_file *seq, void *v)
memset(&crq, 0, sizeof(crq));
crq.request_dump_size.first = IBMVNIC_CRQ_CMD;
crq.request_dump_size.cmd = REQUEST_DUMP_SIZE;
ibmvnic_send_crq(adapter, &crq);
init_completion(&adapter->fw_done);
ibmvnic_send_crq(adapter, &crq);
wait_for_completion(&adapter->fw_done);
seq_write(seq, adapter->dump_data, adapter->dump_data_size);
@ -3629,8 +3630,8 @@ static void handle_crq_init_rsp(struct work_struct *work)
}
}
send_version_xchg(adapter);
reinit_completion(&adapter->init_done);
send_version_xchg(adapter);
if (!wait_for_completion_timeout(&adapter->init_done, timeout)) {
dev_err(dev, "Passive init timeout\n");
goto task_failed;
@ -3640,9 +3641,9 @@ static void handle_crq_init_rsp(struct work_struct *work)
if (adapter->renegotiate) {
adapter->renegotiate = false;
release_sub_crqs_no_irqs(adapter);
send_cap_queries(adapter);
reinit_completion(&adapter->init_done);
send_cap_queries(adapter);
if (!wait_for_completion_timeout(&adapter->init_done,
timeout)) {
dev_err(dev, "Passive init timeout\n");
@ -3772,9 +3773,9 @@ static int ibmvnic_probe(struct vio_dev *dev, const struct vio_device_id *id)
adapter->debugfs_dump = ent;
}
}
ibmvnic_send_crq_init(adapter);
init_completion(&adapter->init_done);
ibmvnic_send_crq_init(adapter);
if (!wait_for_completion_timeout(&adapter->init_done, timeout))
return 0;
@ -3782,9 +3783,9 @@ static int ibmvnic_probe(struct vio_dev *dev, const struct vio_device_id *id)
if (adapter->renegotiate) {
adapter->renegotiate = false;
release_sub_crqs_no_irqs(adapter);
send_cap_queries(adapter);
reinit_completion(&adapter->init_done);
send_cap_queries(adapter);
if (!wait_for_completion_timeout(&adapter->init_done,
timeout))
return 0;