linux-kernel - Re: [PATCH 3.14 30/59] xhci: refuse loading if nousb is used

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Date:	Thu, 28 Jan 2016 17:57:35 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Oliver Neukum <oneukum@...e.com>
Subject: Re: [PATCH 3.14 30/59] xhci: refuse loading if nousb is used

On Wed, Jan 27, 2016 at 10:15:18AM -0800, Greg Kroah-Hartman wrote:
> 3.14-stable review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> From: Oliver Neukum <oneukum@...e.com>
> 
> commit 1eaf35e4dd592c59041bc1ed3248c46326da1f5f upstream.
> 
> The module should fail to load.
> 
> Signed-off-by: Oliver Neukum <oneukum@...e.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> 
> ---
>  drivers/usb/host/xhci.c |    4 ++++
>  1 file changed, 4 insertions(+)
> 
> --- a/drivers/usb/host/xhci.c
> +++ b/drivers/usb/host/xhci.c
> @@ -4893,6 +4893,10 @@ static int __init xhci_hcd_init(void)
>  	BUILD_BUG_ON(sizeof(struct xhci_intr_reg) != 8*32/8);
>  	/* xhci_run_regs has eight fields and embeds 128 xhci_intr_regs */
>  	BUILD_BUG_ON(sizeof(struct xhci_run_regs) != (8+8*128)*32/8);
> +
> +	if (usb_disabled())
> +		return -ENODEV;
> +

I believe the error path should actually call xhci_unregister_pci().
Something like the patch below.  The same is applies to the 3.10
kernel.

Cheers,
--
Luís

>  	return 0;
>  unreg_pci:
>  	xhci_unregister_pci();
> 
> 
> --
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>From 870b9e9479b67df493e2ca3c763102b10d4dd9da Mon Sep 17 00:00:00 2001
From: Oliver Neukum <oneukum@...e.com>
Date: Thu, 3 Dec 2015 15:03:34 +0100
Subject: xhci: refuse loading if nousb is used

commit 1eaf35e4dd592c59041bc1ed3248c46326da1f5f upstream.

The module should fail to load.

Signed-off-by: Oliver Neukum <oneukum@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
[ luis: need to call xhci_unregister_pci() in the error path ]
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/usb/host/xhci.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 20209e870a99..4c78dc564b3a 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -4955,6 +4955,12 @@ static int __init xhci_hcd_init(void)
 	BUILD_BUG_ON(sizeof(struct xhci_intr_reg) != 8*32/8);
 	/* xhci_run_regs has eight fields and embeds 128 xhci_intr_regs */
 	BUILD_BUG_ON(sizeof(struct xhci_run_regs) != (8+8*128)*32/8);
+
+	if (usb_disabled()) {
+		retval = -ENODEV;
+		goto unreg_pci;
+	}
+
 	return 0;
 unreg_pci:
 	xhci_unregister_pci();