linux-kernel - [PATCH] usb: xhci: avoid renesas_usb

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Message-Id: <20210702054754.2056918-1-gthelen@google.com>
Date:   Thu,  1 Jul 2021 22:47:54 -0700
From:   Greg Thelen <gthelen@...gle.com>
To:     Vinod Koul <vkoul@...nel.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Greg Thelen <gthelen@...gle.com>
Subject: [PATCH] usb: xhci: avoid renesas_usb_fw.mem when it's unusable

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).

Signed-off-by: Greg Thelen <gthelen@...gle.com>
---
 drivers/usb/host/xhci-pci.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 18c2bbddf080..cb148da7a789 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -618,8 +618,10 @@ static void xhci_pci_shutdown(struct usb_hcd *hcd)
 /*-------------------------------------------------------------------------*/
 
 static const struct xhci_driver_data reneses_data = {
+#if IS_ENABLED(CONFIG_USB_XHCI_PCI_RENESAS)
 	.quirks  = XHCI_RENESAS_FW_QUIRK,
 	.firmware = "renesas_usb_fw.mem",
+#endif
 };
 
 /* PCI driver selection metadata; PCI hotplugging uses this */
@@ -636,7 +638,13 @@ static const struct pci_device_id pci_ids[] = {
 	{ /* 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 = {
-- 
2.32.0.93.g670b81a890-goog