Re: [PATCH net] net: lapbether: Prevent racing when checking whether the netif is running
From: Xie He <hidden>
Date: 2021-03-11 23:13:57
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On Thu, Mar 11, 2021 at 2:52 PM Jakub Kicinski [off-list ref] wrote:
Normally driver's ndo_stop() calls netif_tx_disable() which takes TX locks, so unless your driver is lockless (LLTX) there should be no xmit calls after that point.
Do you mean I should call "netif_tx_disable" inside my "ndo_stop"
function as a fix for the racing between "ndo_stop" and
"ndo_start_xmit"?
I can't call "netif_tx_disable" inside my "ndo_stop" function because
"netif_tx_disable" will call "netif_tx_stop_queue", which causes
another racing problem. Please see my recent commit f7d9d4854519
("net: lapbether: Remove netif_start_queue / netif_stop_queue")