From: Alan Stern <stern@rowland.harvard.edu>
To: Chunfeng Yun <chunfeng.yun@mediatek.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Matthias Brugger <matthias.bgg@gmail.com>,
Thinh Nguyen <Thinh.Nguyen@synopsys.com>,
"Gustavo A . R . Silva" <gustavoars@kernel.org>,
Bixuan Cui <cuibixuan@huawei.com>,
Eugeniu Rosca <erosca@de.adit-jv.com>,
Oliver Neukum <oneukum@suse.com>,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-mediatek@lists.infradead.org,
Tianping Fang <tianping.fang@mediatek.com>,
Eddie Hung <eddie.hung@mediatek.com>,
Ikjoon Jang <ikjn@chromium.org>
Subject: Re: [PATCH] usb: core: hub: fix race condition about TRSMRCY of resume
Date: Tue, 11 May 2021 12:39:07 -0400 [thread overview]
Message-ID: <20210511163907.GB901897@rowland.harvard.edu> (raw)
In-Reply-To: <20210511101522.34193-1-chunfeng.yun@mediatek.com>
On Tue, May 11, 2021 at 06:15:22PM +0800, Chunfeng Yun wrote:
> This may happen if the port becomes resume status exactly
> when usb_port_resume() gets port status, it still need provide
> a TRSMCRY time before access the device.
>
> Reported-by: Tianping Fang <tianping.fang@mediatek.com>
> Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
This should also say:
CC: <stable@vger.kernel.org>
> ---
> drivers/usb/core/hub.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
> index b2bc4b7c4289..fc7d6cdacf16 100644
> --- a/drivers/usb/core/hub.c
> +++ b/drivers/usb/core/hub.c
> @@ -3642,9 +3642,6 @@ int usb_port_resume(struct usb_device *udev, pm_message_t msg)
> * sequence.
> */
> status = hub_port_status(hub, port1, &portstatus, &portchange);
> -
> - /* TRSMRCY = 10 msec */
> - msleep(10);
> }
>
> SuspendCleared:
> @@ -3659,6 +3656,9 @@ int usb_port_resume(struct usb_device *udev, pm_message_t msg)
> usb_clear_port_feature(hub->hdev, port1,
> USB_PORT_FEAT_C_SUSPEND);
> }
> +
> + /* TRSMRCY = 10 msec */
> + msleep(10);
> }
>
> if (udev->persist_enabled)
Acked-by: Alan Stern <stern@rowland.harvard.edu>
next prev parent reply other threads:[~2021-05-11 16:39 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-11 10:15 [PATCH] usb: core: hub: fix race condition about TRSMRCY of resume Chunfeng Yun
2021-05-11 11:27 ` Greg Kroah-Hartman
2021-05-12 2:02 ` Chunfeng Yun
2021-05-11 16:39 ` Alan Stern [this message]
2021-05-12 2:03 ` Chunfeng Yun
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