linux-kernel - [PATCH 5.10 117/167] usb: xhci: avoid renesas_usb

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Date:   Mon, 26 Jul 2021 17:39:10 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Greg Thelen <gthelen@...gle.com>
Subject: [PATCH 5.10 117/167] usb: xhci: avoid renesas_usb_fw.mem when its unusable

From: Greg Thelen <gthelen@...gle.com>

commit 0665e387318607d8269bfdea60723c627c8bae43 upstream.

Commit a66d21d7dba8 ("usb: xhci: Add support for Renesas controller with
memory") added renesas_usb_fw.mem firmware reference to xhci-pci.  Thus
modinfo indicates xhci-pci.ko has "firmware: renesas_usb_fw.mem".  But
the firmware is only actually used with CONFIG_USB_XHCI_PCI_RENESAS.  An
unusable firmware reference can trigger safety checkers which look for
drivers with unmet firmware dependencies.

Avoid referring to renesas_usb_fw.mem in circumstances when it cannot be
loaded (when CONFIG_USB_XHCI_PCI_RENESAS isn't set).

Fixes: a66d21d7dba8 ("usb: xhci: Add support for Renesas controller with memory")
Cc: stable <stable@...r.kernel.org>
Signed-off-by: Greg Thelen <gthelen@...gle.com>
Link: https://lore.kernel.org/r/20210702071224.3673568-1-gthelen@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/host/xhci-pci.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -631,7 +631,14 @@ static const struct pci_device_id pci_id
 	{ /* end: all zeroes */ }
 };
 MODULE_DEVICE_TABLE(pci, pci_ids);
+
+/*
+ * Without CONFIG_USB_XHCI_PCI_RENESAS renesas_xhci_check_request_fw() won't
+ * load firmware, so don't encumber the xhci-pci driver with it.
+ */
+#if IS_ENABLED(CONFIG_USB_XHCI_PCI_RENESAS)
 MODULE_FIRMWARE("renesas_usb_fw.mem");
+#endif
 
 /* pci driver glue; this is a "new style" PCI driver module */
 static struct pci_driver xhci_pci_driver = {