[PATCH 4.9 016/108] ibmvnic: Initialize completion variables before starting work

Greg Kroah-Hartman
2017-06-15T17:57:18Z

From: Nathan Fontenot <nfont@linux.vnet.ibm.com>

[ Upstream commit db5d0b597bc27bbddf40f2f8359a73be4eb77104 ]

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>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/ibm/ibmvnic.c | 17 +++++++++--------
1 file changed, 9 insertions(+), 8 deletions(-)

--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -189,9 +189,10 @@ static int alloc_long_term_buff(struct i
}
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;
}
@@ -1133,10 +1134,10 @@ static void ibmvnic_get_ethtool_stats(st
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++)
@@ -2809,9 +2810,9 @@ static ssize_t trace_read(struct file *f
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))
@@ -3591,9 +3592,9 @@ static int ibmvnic_dump_show(struct seq_
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);
@@ -3639,8 +3640,8 @@ static void handle_crq_init_rsp(struct w
}
}

- 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;
@@ -3650,9 +3651,9 @@ static void handle_crq_init_rsp(struct w
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");
@@ -3780,9 +3781,9 @@ static int ibmvnic_probe(struct vio_dev
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;

@@ -3790,9 +3791,9 @@ static int ibmvnic_probe(struct vio_dev
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;