[PATCH] usb: core: hcd: only check primary hcd skip_phy_initialization

[PATCH] usb: core: hcd: only check primary hcd skip_phy_initialization

[Xu Yang]

Before commit 53a2d95df836 ("usb: core: add phy notify connect and
disconnect"), phy initialization will be skipped even when shared hcd
doesn't set skip_phy_initialization flag. However, the situation is
changed after the commit. The hcd.c will initialize phy when add shared
hcd. This behavior is unexpected for some platforms which will handle phy
initialization by themselves. To avoid the issue, this will only check
skip_phy_initialization flag of primary hcd since shared hcd normally
follow primary hcd setting.

Fixes: 53a2d95df836 ("usb: core: add phy notify connect and disconnect")
Cc: stable@vger.kernel.org
Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
---
 drivers/usb/core/hcd.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 500dc35e6477..0b2490347b9f 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -2794,8 +2794,14 @@ int usb_add_hcd(struct usb_hcd *hcd,
 	int retval;
 	struct usb_device *rhdev;
 	struct usb_hcd *shared_hcd;
+	int skip_phy_initialization;
 
-	if (!hcd->skip_phy_initialization) {
+	if (usb_hcd_is_primary_hcd(hcd))
+		skip_phy_initialization = hcd->skip_phy_initialization;
+	else
+		skip_phy_initialization = hcd->primary_hcd->skip_phy_initialization;
+
+	if (!skip_phy_initialization) {
 		if (usb_hcd_is_primary_hcd(hcd)) {
 			hcd->phy_roothub = usb_phy_roothub_alloc(hcd->self.sysdev);
 			if (IS_ERR(hcd->phy_roothub))
-- 
2.34.1

Re: [PATCH] usb: core: hcd: only check primary hcd skip_phy_initialization

[Xu Yang]

Hi,

On Tue, Nov 05, 2024 at 05:01:20PM +0800, Xu Yang wrote:
> Before commit 53a2d95df836 ("usb: core: add phy notify connect and
> disconnect"), phy initialization will be skipped even when shared hcd
> doesn't set skip_phy_initialization flag. However, the situation is
> changed after the commit. The hcd.c will initialize phy when add shared
> hcd. This behavior is unexpected for some platforms which will handle phy
> initialization by themselves. To avoid the issue, this will only check
> skip_phy_initialization flag of primary hcd since shared hcd normally
> follow primary hcd setting.
> 
> Fixes: 53a2d95df836 ("usb: core: add phy notify connect and disconnect")
> Cc: stable@vger.kernel.org
> Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
> ---
>  drivers/usb/core/hcd.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
> index 500dc35e6477..0b2490347b9f 100644
> --- a/drivers/usb/core/hcd.c
> +++ b/drivers/usb/core/hcd.c
> @@ -2794,8 +2794,14 @@ int usb_add_hcd(struct usb_hcd *hcd,
>  	int retval;
>  	struct usb_device *rhdev;
>  	struct usb_hcd *shared_hcd;
> +	int skip_phy_initialization;
>  
> -	if (!hcd->skip_phy_initialization) {
> +	if (usb_hcd_is_primary_hcd(hcd))
> +		skip_phy_initialization = hcd->skip_phy_initialization;
> +	else
> +		skip_phy_initialization = hcd->primary_hcd->skip_phy_initialization;
> +
> +	if (!skip_phy_initialization) {
>  		if (usb_hcd_is_primary_hcd(hcd)) {
>  			hcd->phy_roothub = usb_phy_roothub_alloc(hcd->self.sysdev);
>  			if (IS_ERR(hcd->phy_roothub))

A gentle ping.

> -- 
> 2.34.1
>