linux-kernel - [PATCH] usb: xhci: xhci_setup_port_arrays: early -ENODEV if maxports is 0.

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Message-ID: <20240930052336.80589-1-olivierdautricourt@gmail.com>
Date: Mon, 30 Sep 2024 07:23:29 +0200
From: Olivier Dautricourt <olivierdautricourt@...il.com>
To: Mathias Nyman <mathias.nyman@...el.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Olivier Dautricourt <olivierdautricourt@...il.com>
Subject: [PATCH] usb: xhci: xhci_setup_port_arrays: early -ENODEV if maxports is 0.

If the controller reports HCSPARAMS1.maxports==0 then we can skip the
whole function: it would fail later after doing a bunch of unnecessary
stuff. It can occur on a buggy hardware (the value is driven by external
signals).

Signed-off-by: Olivier Dautricourt <olivierdautricourt@...il.com>
---
 drivers/usb/host/xhci-mem.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index d2900197a49e..e8406db78782 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -2160,6 +2160,11 @@ static int xhci_setup_port_arrays(struct xhci_hcd *xhci, gfp_t flags)
 	struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
 
 	num_ports = HCS_MAX_PORTS(xhci->hcs_params1);
+	if (num_ports == 0) {
+		xhci_warn(xhci, "Host controller has no port enabled\n");
+		return -ENODEV;
+	}
+
 	xhci->hw_ports = kcalloc_node(num_ports, sizeof(*xhci->hw_ports),
 				flags, dev_to_node(dev));
 	if (!xhci->hw_ports)
-- 
2.43.0