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FAILED: patch "[PATCH] brcmfmac: pcie: Fix crashes due to early IRQs" failed to apply to 4.19-stable tree

PATCH [email protected] 1 participant 1 message Apr 2, 2022

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Stable branch Broadcom BRCM80211 IEEE802.11 wireless drivers
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The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From b50255c83b914defd61a57fbc81d452334b63f4c Mon Sep 17 00:00:00 2001
From: Hector Martin <[email protected]>
Date: Tue, 1 Feb 2022 01:07:10 +0900
Subject: [PATCH] brcmfmac: pcie: Fix crashes due to early IRQs

The driver was enabling IRQs before the message processing was initialized. This could cause IRQs to come in too early and crash the driver. Instead, move the IRQ enable and hostready to a bus preinit function, at which point everything is properly initialized.

Fixes 9e37f045d5e7 ("brcmfmac: Adding PCIe bus layer support.")
Reviewed-by Linus Walleij <[email protected]>
Reviewed-by Arend van Spriel <[email protected]>
Cc [email protected]
Signed-off-by Hector Martin <[email protected]>
Reviewed-by Andy Shevchenko <[email protected]>
Signed-off-by Kalle Valo <[email protected]>
Link https://lore.kernel.org/r/[email protected] open here
drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c +13 -3
index 3f3ca7612bcd..55f0111283c9 100644
@@ -1315,6 +1315,18 @@ static void brcmf_pcie_down(struct device *dev)
 {
 }
 
+static int brcmf_pcie_preinit(struct device *dev)
+{
+	struct brcmf_bus *bus_if = dev_get_drvdata(dev);
+	struct brcmf_pciedev *buspub = bus_if->bus_priv.pcie;
+
+	brcmf_dbg(PCIE, "Enter\n");
+
+	brcmf_pcie_intr_enable(buspub->devinfo);
+	brcmf_pcie_hostready(buspub->devinfo);
+
+	return 0;
+}
 
 static int brcmf_pcie_tx(struct device *dev, struct sk_buff *skb)
 {

@@ -1423,6 +1435,7 @@ static int brcmf_pcie_reset(struct device *dev)
 }
 
 static const struct brcmf_bus_ops brcmf_pcie_bus_ops = {
+	.preinit = brcmf_pcie_preinit,
 	.txdata = brcmf_pcie_tx,
 	.stop = brcmf_pcie_down,
 	.txctl = brcmf_pcie_tx_ctlpkt,

@@ -1795,9 +1808,6 @@ static void brcmf_pcie_setup(struct device *dev, int ret,
 
 	init_waitqueue_head(&devinfo->mbdata_resp_wait);
 
-	brcmf_pcie_intr_enable(devinfo);
-	brcmf_pcie_hostready(devinfo);
-
 	ret = brcmf_attach(&devinfo->pdev->dev);
 	if (ret)
 		goto fail;