brcmfmac: fix firmware crash due to mismatched completion handlers#7460
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Without a valid cookie to distinguish pending concurrent completion events, mismatches occur under concurrency that crash the firmware. This fix uses a monotonous atomic counter that guarantees unique ids. Signed-off-by: Bogdan Nicolae <bogdan.nicolae@acm.org>
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I can see how that might make a difference, but also it doesn't look as if it could break anything. |
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@bnicolae Could you please send this patch upstream? |
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Without a valid cookie to distinguish pending concurrent completion events, mismatches occur under concurrency that crash the firmware. The cookie is used to populate mf_params->packet_id and is sent to firmware via vif->mgmt_tx_id. Later, completions are matched using if (packet_id != vif->mgmt_tx_id). This fix uses a monotonous atomic counter that guarantees unique ids.