[PATCH v3] xhci: tegra: fix checked USB2 port number

[PATCH v3] xhci: tegra: fix checked USB2 port number

[Henry Lin]

If USB virtualizatoin is enabled, USB2 ports are shared between all
Virtual Functions. The USB2 port number owned by an USB2 root hub in
a Virtual Function may be less than total USB2 phy number supported
by the Tegra XUSB controller.

Using total USB2 phy number as port number to check all PORTSC values
would cause invalid memory access.

[  116.923438] Unable to handle kernel paging request at virtual address 006c622f7665642f
...
[  117.213640] Call trace:
[  117.216783]  tegra_xusb_enter_elpg+0x23c/0x658
[  117.222021]  tegra_xusb_runtime_suspend+0x40/0x68
[  117.227260]  pm_generic_runtime_suspend+0x30/0x50
[  117.232847]  __rpm_callback+0x84/0x3c0
[  117.237038]  rpm_suspend+0x2dc/0x740
[  117.241229] pm_runtime_work+0xa0/0xb8
[  117.245769]  process_scheduled_works+0x24c/0x478
[  117.251007]  worker_thread+0x23c/0x328
[  117.255547]  kthread+0x104/0x1b0
[  117.259389]  ret_from_fork+0x10/0x20
[  117.263582] Code: 54000222 f9461ae8 f8747908 b4ffff48 (f9400100)

Cc: <stable@vger.kernel.org> # v6.3+
Fixes: a30951d31b25 ("xhci: tegra: USB2 pad power controls")
Signed-off-by: Henry Lin <henryl@nvidia.com>
---
 drivers/usb/host/xhci-tegra.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/host/xhci-tegra.c b/drivers/usb/host/xhci-tegra.c
index 6246d5ad1468..76f228e7443c 100644
--- a/drivers/usb/host/xhci-tegra.c
+++ b/drivers/usb/host/xhci-tegra.c
@@ -2183,7 +2183,7 @@ static int tegra_xusb_enter_elpg(struct tegra_xusb *tegra, bool runtime)
 		goto out;
 	}
 
-	for (i = 0; i < tegra->num_usb_phys; i++) {
+	for (i = 0; i < xhci->usb2_rhub.num_ports; i++) {
 		if (!xhci->usb2_rhub.ports[i])
 			continue;
 		portsc = readl(xhci->usb2_rhub.ports[i]->addr);
-- 
2.25.1

Re: [PATCH v3] xhci: tegra: fix checked USB2 port number

[Greg Kroah-Hartman]

On Fri, Oct 11, 2024 at 10:51:14PM +0800, Henry Lin wrote:
> If USB virtualizatoin is enabled, USB2 ports are shared between all
> Virtual Functions. The USB2 port number owned by an USB2 root hub in
> a Virtual Function may be less than total USB2 phy number supported
> by the Tegra XUSB controller.
> 
> Using total USB2 phy number as port number to check all PORTSC values
> would cause invalid memory access.
> 
> [  116.923438] Unable to handle kernel paging request at virtual address 006c622f7665642f
> ...
> [  117.213640] Call trace:
> [  117.216783]  tegra_xusb_enter_elpg+0x23c/0x658
> [  117.222021]  tegra_xusb_runtime_suspend+0x40/0x68
> [  117.227260]  pm_generic_runtime_suspend+0x30/0x50
> [  117.232847]  __rpm_callback+0x84/0x3c0
> [  117.237038]  rpm_suspend+0x2dc/0x740
> [  117.241229] pm_runtime_work+0xa0/0xb8
> [  117.245769]  process_scheduled_works+0x24c/0x478
> [  117.251007]  worker_thread+0x23c/0x328
> [  117.255547]  kthread+0x104/0x1b0
> [  117.259389]  ret_from_fork+0x10/0x20
> [  117.263582] Code: 54000222 f9461ae8 f8747908 b4ffff48 (f9400100)
> 
> Cc: <stable@vger.kernel.org> # v6.3+
> Fixes: a30951d31b25 ("xhci: tegra: USB2 pad power controls")
> Signed-off-by: Henry Lin <henryl@nvidia.com>
> ---
>  drivers/usb/host/xhci-tegra.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/host/xhci-tegra.c b/drivers/usb/host/xhci-tegra.c
> index 6246d5ad1468..76f228e7443c 100644
> --- a/drivers/usb/host/xhci-tegra.c
> +++ b/drivers/usb/host/xhci-tegra.c
> @@ -2183,7 +2183,7 @@ static int tegra_xusb_enter_elpg(struct tegra_xusb *tegra, bool runtime)
>  		goto out;
>  	}
>  
> -	for (i = 0; i < tegra->num_usb_phys; i++) {
> +	for (i = 0; i < xhci->usb2_rhub.num_ports; i++) {
>  		if (!xhci->usb2_rhub.ports[i])
>  			continue;
>  		portsc = readl(xhci->usb2_rhub.ports[i]->addr);
> -- 
> 2.25.1
> 
> 

Hi,

This is the friendly patch-bot of Greg Kroah-Hartman.  You have sent him
a patch that has triggered this response.  He used to manually respond
to these common problems, but in order to save his sanity (he kept
writing the same thing over and over, yet to different people), I was
created.  Hopefully you will not take offence and will fix the problem
in your patch and resubmit it so that it can be accepted into the Linux
kernel tree.

You are receiving this message because of the following common error(s)
as indicated below:

- This looks like a new version of a previously submitted patch, but you
  did not list below the --- line any changes from the previous version.
  Please read the section entitled "The canonical patch format" in the
  kernel file, Documentation/process/submitting-patches.rst for what
  needs to be done here to properly describe this.

If you wish to discuss this problem further, or you have questions about
how to resolve this issue, please feel free to respond to this email and
Greg will reply once he has dug out from the pending patches received
from other developers.

thanks,

greg k-h's patch email bot