linux-kernel - [PATCH V2] usb: xhci: avoid renesas_usb

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Message-Id: <20210702071224.3673568-1-gthelen@google.com>
Date:   Fri,  2 Jul 2021 00:12:24 -0700
From:   Greg Thelen <gthelen@...gle.com>
To:     Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Vinod Koul <vkoul@...nel.org>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Greg Thelen <gthelen@...gle.com>
Subject: [PATCH V2] 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).

Fixes: a66d21d7dba8 ("usb: xhci: Add support for Renesas controller with memory")
Signed-off-by: Greg Thelen <gthelen@...gle.com>
---
Changelog since v1:
- Smaller patch, only filters out MODULE_FIRMWARE()
- Added blank line
- Added Fixes footer to commit log

drivers/usb/host/xhci-pci.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 18c2bbddf080..1c9a7957c45c 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -636,7 +636,14 @@ 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