From: Chunfeng Yun <chunfeng.yun@mediatek.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Alan Stern <stern@rowland.harvard.edu>
Cc: 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>,
Chunfeng Yun <chunfeng.yun@mediatek.com>,
<stable@vger.kernel.org>
Subject: [PATCH v2] usb: core: hub: fix race condition about TRSMRCY of resume
Date: Wed, 12 May 2021 10:07:38 +0800 [thread overview]
Message-ID: <20210512020738.52961-1-chunfeng.yun@mediatek.com> (raw)
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.
CC: <stable@vger.kernel.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Reported-by: Tianping Fang <tianping.fang@mediatek.com>
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
---
v2:
cc stable suggested by Alan,
and add acked-by Alan
---
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)
--
2.18.0
reply other threads:[~2021-05-12 2:07 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210512020738.52961-1-chunfeng.yun@mediatek.com \
--to=chunfeng.yun@mediatek.com \
--cc=Thinh.Nguyen@synopsys.com \
--cc=cuibixuan@huawei.com \
--cc=eddie.hung@mediatek.com \
--cc=erosca@de.adit-jv.com \
--cc=gregkh@linuxfoundation.org \
--cc=gustavoars@kernel.org \
--cc=ikjn@chromium.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mediatek@lists.infradead.org \
--cc=linux-usb@vger.kernel.org \
--cc=matthias.bgg@gmail.com \
--cc=oneukum@suse.com \
--cc=stable@vger.kernel.org \
--cc=stern@rowland.harvard.edu \
--cc=tianping.fang@mediatek.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).