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Subject[PATCH 5.11 034/306] ibmvnic: Fix possibly uninitialized old_num_tx_queues variable warning.
Date
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

From: Michal Suchanek <msuchanek@suse.de>

commit 6881b07fdd24850def1f03761c66042b983ff86e upstream.

GCC 7.5 reports:
../drivers/net/ethernet/ibm/ibmvnic.c: In function 'ibmvnic_reset_init':
../drivers/net/ethernet/ibm/ibmvnic.c:5373:51: warning: 'old_num_tx_queues' may be used uninitialized in this function [-Wmaybe-uninitialized]
../drivers/net/ethernet/ibm/ibmvnic.c:5373:6: warning: 'old_num_rx_queues' may be used uninitialized in this function [-Wmaybe-uninitialized]

The variable is initialized only if(reset) and used only if(reset &&
something) so this is a false positive. However, there is no reason to
not initialize the variables unconditionally avoiding the warning.

Fixes: 635e442f4a48 ("ibmvnic: merge ibmvnic_reset_init and ibmvnic_init")
Signed-off-by: Michal Suchanek <msuchanek@suse.de>
Reviewed-by: Sukadev Bhattiprolu <sukadev@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/ibm/ibmvnic.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)

--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -5283,16 +5283,14 @@ static int ibmvnic_reset_init(struct ibm
{
struct device *dev = &adapter->vdev->dev;
unsigned long timeout = msecs_to_jiffies(20000);
- u64 old_num_rx_queues, old_num_tx_queues;
+ u64 old_num_rx_queues = adapter->req_rx_queues;
+ u64 old_num_tx_queues = adapter->req_tx_queues;
int rc;

adapter->from_passive_init = false;

- if (reset) {
- old_num_rx_queues = adapter->req_rx_queues;
- old_num_tx_queues = adapter->req_tx_queues;
+ if (reset)
reinit_completion(&adapter->init_done);
- }

adapter->init_done_rc = 0;
rc = ibmvnic_send_crq_init(adapter);

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