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network: do not reconfigure wireless interface when previously not connected to any APs

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Follow-up for 6706ce2fd2a13df0ae5e469b72d688eaf643dac4.

Fixes #21685.
This commit is contained in:
Yu Watanabe 2021-12-09 03:04:21 +09:00
parent da94e4ddf5
commit d9910948eb
1 changed files with 14 additions and 6 deletions
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20
src/network/networkd-link.c
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@ -1602,13 +1602,21 @@ static int link_carrier_gained(Link *link) {
if (r < 0)
log_link_warning_errno(link, r, "Failed to disable carrier lost timer, ignoring: %m");
/* If the SSID is changed, then the connected wireless network could be changed. So, always
* reconfigure the link. Which means e.g. the DHCP client will be restarted, and the correct
* network information will be gained.
/* If a wireless interface was connected to an access point, and the SSID is changed (that is,
* both previous_ssid and ssid are non-NULL), then the connected wireless network could be
* changed. So, always reconfigure the link. Which means e.g. the DHCP client will be
* restarted, and the correct network information will be gained.
*
* However, do not reconfigure the wireless interface forcibly if it was not connected to any
* access points previously (previous_ssid is NULL in this case). As, a .network file may be
* already assigned to the interface (in that case, the .network file does not have the SSID=
* setting in the [Match] section), and the interface is already being configured. Of course,
* there may exist another .network file with higher priority and a matching SSID= setting. But
* in that case, link_reconfigure_impl() can handle that without the force_reconfigure flag.
*
* For non-wireless interfaces, we have no way to detect the connected network change. So,
* setting force_reconfigure = false. Note, both ssid and previous_ssid should be NULL for
* non-wireless interfaces, and streq_ptr() returns true. */
force_reconfigure = !streq_ptr(link->previous_ssid, link->ssid);
* setting force_reconfigure = false. Note, both ssid and previous_ssid are NULL in that case. */
force_reconfigure = link->previous_ssid && !streq_ptr(link->previous_ssid, link->ssid);
link->previous_ssid = mfree(link->previous_ssid);
if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_FAILED, LINK_STATE_LINGER)) {