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net: ipa: only set endpoint netdev pointer when in use

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In ipa_modem_start(), we set endpoint netdev pointers before the
network device is registered.  If registration fails, we don't undo
those assignments.  Instead, wait to assign the netdev pointer until
after registration succeeds.

Set these endpoint netdev pointers to NULL in ipa_modem_stop()
before unregistering the network device.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Alex Elder 2021-04-09 13:07:18 -05:00 committed by Jakub Kicinski
parent 49e76a4189
commit 57f63faf05
1 changed files with 9 additions and 7 deletions
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16
drivers/net/ipa/ipa_modem.c
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@ -1,7 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2014-2018, The Linux Foundation. All rights reserved.
* Copyright (C) 2018-2020 Linaro Ltd.
* Copyright (C) 2018-2021 Linaro Ltd.
*/
#include <linux/errno.h>
@ -213,18 +213,18 @@ int ipa_modem_start(struct ipa *ipa)
goto out_set_state;
}
ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]->netdev = netdev;
ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]->netdev = netdev;
SET_NETDEV_DEV(netdev, &ipa->pdev->dev);
priv = netdev_priv(netdev);
priv->ipa = ipa;
ret = register_netdev(netdev);
if (ret)
free_netdev(netdev);
else
if (!ret) {
ipa->modem_netdev = netdev;
ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]->netdev = netdev;
ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]->netdev = netdev;
} else {
free_netdev(netdev);
}
out_set_state:
if (ret)
@ -263,6 +263,8 @@ int ipa_modem_stop(struct ipa *ipa)
if (ret)
goto out_set_state;
ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]->netdev = NULL;
ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]->netdev = NULL;
ipa->modem_netdev = NULL;
unregister_netdev(netdev);
free_netdev(netdev);