linux-kernel - Re: [PATCH 5.13 024/800] usb: renesas-xhci: Fix handling of unknown ROM state

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Message-ID: <YPNavEl340mxcNVd@epycbox.lan>
Date:   Sat, 17 Jul 2021 15:33:32 -0700
From:   Moritz Fischer <mdf@...nel.org>
To:     Justin Forbes <jmforbes@...uxtx.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Stable <stable@...r.kernel.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Vinod Koul <vkoul@...nel.org>, Moritz Fischer <mdf@...nel.org>
Subject: Re: [PATCH 5.13 024/800] usb: renesas-xhci: Fix handling of unknown
 ROM state

Justin,

On Sat, Jul 17, 2021 at 08:39:19AM -0500, Justin Forbes wrote:
> On Mon, Jul 12, 2021 at 2:31 AM Greg Kroah-Hartman
> <gregkh@...uxfoundation.org> wrote:
> >
> > From: Moritz Fischer <mdf@...nel.org>
> >
> > commit d143825baf15f204dac60acdf95e428182aa3374 upstream.
> >
> > The ROM load sometimes seems to return an unknown status
> > (RENESAS_ROM_STATUS_NO_RESULT) instead of success / fail.
> >
> > If the ROM load indeed failed this leads to failures when trying to
> > communicate with the controller later on.
> >
> > Attempt to load firmware using RAM load in those cases.
> >
> > Fixes: 2478be82de44 ("usb: renesas-xhci: Add ROM loader for uPD720201")
> > Cc: stable@...r.kernel.org
> > Cc: Mathias Nyman <mathias.nyman@...el.com>
> > Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > Cc: Vinod Koul <vkoul@...nel.org>
> > Tested-by: Vinod Koul <vkoul@...nel.org>
> > Reviewed-by: Vinod Koul <vkoul@...nel.org>
> > Signed-off-by: Moritz Fischer <mdf@...nel.org>
> > Link: https://lore.kernel.org/r/20210615153758.253572-1-mdf@kernel.org
> > Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> >
> 
> After sending out 5.12.17 for testing, we had a user complain that all
> of their USB devices disappeared with the error:
> 
> Jul 15 23:18:53 kernel: xhci_hcd 0000:04:00.0: Direct firmware load
> for renesas_usb_fw.mem failed with error -2
> Jul 15 23:18:53 kernel: xhci_hcd 0000:04:00.0: request_firmware failed: -2
> Jul 15 23:18:53 kernel: xhci_hcd: probe of 0000:04:00.0 failed with error -2

This looks like it fails finding the actual firmware file (ENOENT). Any
chance you could give this a whirl on top of the original patch?

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 18c2bbddf080..cde8f6f1ec5d 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -379,7 +379,11 @@ static int xhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
        driver_data = (struct xhci_driver_data *)id->driver_data;
        if (driver_data && driver_data->quirks & XHCI_RENESAS_FW_QUIRK) {
                retval = renesas_xhci_check_request_fw(dev, id);
-               if (retval)
+               /*
+                * If firmware wasn't found there's still a chance this might work without
+                * loading firmware on some systems, so let's try at least.
+                */
+               if (retval && retval != -ENOENT)
                        return retval;
        }


Thanks,
Moritz