linux-kernel - [BUG] brcmfmac locks up on resume from suspend

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Date:   Fri, 18 Jun 2021 23:36:11 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Arend van Spriel <arend.vanspriel@...adcom.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Chi-Hsien Lin <chi-hsien.lin@...ress.com>,
        Wright Feng <wright.feng@...ress.com>,
        Kalle Valo <kvalo@...eaurora.org>
Cc:     "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "brcm80211-dev-list.pdl@...adcom.com" 
        <brcm80211-dev-list.pdl@...adcom.com>,
        "brcm80211-dev-list@...ress.com" <brcm80211-dev-list@...ress.com>,
        netdev <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [BUG] brcmfmac locks up on resume from suspend

Hi,

I'm getting a hang on resume from suspend using today's next-20210618.
It's tested on Tegra20 Acer A500 that has older BCM4329, but seems the
problem is generic.

There is this line in pstore log:

  ieee80211 phy0: brcmf_netdev_start_xmit: xmit rejected state=0

Steps to reproduce:

1. Boot system
2. Connect WiFi
3. Run "rtcwake -s10 -mmem"

What's interesting is that turning WiFi off/on before suspending makes
resume to work and there are no suspicious messages in KMSG, all further
resumes work too.

This change fixes the hang:

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
index db5f8535fdb5..06d16f7776c7 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
@@ -301,7 +301,6 @@ static netdev_tx_t brcmf_netdev_start_xmit(struct
sk_buff *skb,
 	/* Can the device send data? */
 	if (drvr->bus_if->state != BRCMF_BUS_UP) {
 		bphy_err(drvr, "xmit rejected state=%d\n", drvr->bus_if->state);
-		netif_stop_queue(ndev);
 		dev_kfree_skb(skb);
 		ret = -ENODEV;
 		goto done;
8<---

Comments? Suggestions? Thanks in advance.