* [PATCH v3] usb: gadget: function: fix missing spinlock in f_uac1_legacy
@ 2020-07-05 12:40 qiang.zhang
2020-07-06 19:55 ` Greg KH
2020-07-07 8:35 ` Sergei Shtylyov
0 siblings, 2 replies; 5+ messages in thread
From: qiang.zhang @ 2020-07-05 12:40 UTC (permalink / raw)
To: balbi; +Cc: colin.king, gregkh, linux-usb, linux-kernel, stable
From: Zhang Qiang <qiang.zhang@windriver.com>
Add a missing spinlock protection for play_queue, because
the play_queue may be destroyed when the "playback_work"
work func and "f_audio_out_ep_complete" callback func
operate this paly_queue at the same time.
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Zhang Qiang <qiang.zhang@windriver.com>
---
v1->v2->v3:
Add changelog text and Cc tags.
drivers/usb/gadget/function/f_uac1_legacy.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/usb/gadget/function/f_uac1_legacy.c b/drivers/usb/gadget/function/f_uac1_legacy.c
index 349deae7cabd..e2d7f69128a0 100644
--- a/drivers/usb/gadget/function/f_uac1_legacy.c
+++ b/drivers/usb/gadget/function/f_uac1_legacy.c
@@ -336,7 +336,9 @@ static int f_audio_out_ep_complete(struct usb_ep *ep, struct usb_request *req)
/* Copy buffer is full, add it to the play_queue */
if (audio_buf_size - copy_buf->actual < req->actual) {
+ spin_lock_irq(&audio->lock);
list_add_tail(©_buf->list, &audio->play_queue);
+ spin_unlock_irq(&audio->lock);
schedule_work(&audio->playback_work);
copy_buf = f_audio_buffer_alloc(audio_buf_size);
if (IS_ERR(copy_buf))
--
2.24.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH v3] usb: gadget: function: fix missing spinlock in f_uac1_legacy
2020-07-05 12:40 [PATCH v3] usb: gadget: function: fix missing spinlock in f_uac1_legacy qiang.zhang
@ 2020-07-06 19:55 ` Greg KH
2020-07-07 2:28 ` 回复: " Zhang, Qiang
2020-07-07 8:35 ` Sergei Shtylyov
1 sibling, 1 reply; 5+ messages in thread
From: Greg KH @ 2020-07-06 19:55 UTC (permalink / raw)
To: qiang.zhang; +Cc: balbi, colin.king, linux-usb, linux-kernel, stable
On Sun, Jul 05, 2020 at 08:40:27PM +0800, qiang.zhang@windriver.com wrote:
> From: Zhang Qiang <qiang.zhang@windriver.com>
>
> Add a missing spinlock protection for play_queue, because
> the play_queue may be destroyed when the "playback_work"
> work func and "f_audio_out_ep_complete" callback func
> operate this paly_queue at the same time.
"play_queue", right?
>
> Cc: stable <stable@vger.kernel.org>
> Signed-off-by: Zhang Qiang <qiang.zhang@windriver.com>
Because you do not have a Fixes: tag in here, how far back do you want
the stable patch to go to? That's why, if you can, it's always good to
have a "Fixes:" tag in there to show what commit caused the problem you
are fixing here.
So, what commit caused this?
thanks,
gre gk-h
^ permalink raw reply [flat|nested] 5+ messages in thread
* 回复: [PATCH v3] usb: gadget: function: fix missing spinlock in f_uac1_legacy
2020-07-06 19:55 ` Greg KH
@ 2020-07-07 2:28 ` Zhang, Qiang
2020-07-07 6:51 ` Greg KH
0 siblings, 1 reply; 5+ messages in thread
From: Zhang, Qiang @ 2020-07-07 2:28 UTC (permalink / raw)
To: Greg KH; +Cc: balbi, colin.king, linux-usb, linux-kernel, stable
Hi Greg KH
In the early submission:
"commit id c6994e6f067cf0fc4c6cca3d164018b1150916f8" which add USB Audio Gadget driver "
the "audio->play_queue" was protected from "audio->lock"
spinlock in "playback_work" func, But in "f_audio_out_ep_complete" func
there is no protection for the operation of this "audio->play_queue". there
are missing spinlock, Fix tags should add up here commit?
________________________________________
发件人: Greg KH <gregkh@linuxfoundation.org>
发送时间: 2020年7月7日 3:55
收件人: Zhang, Qiang
抄送: balbi@kernel.org; colin.king@canonical.com; linux-usb@vger.kernel.org; linux-kernel@vger.kernel.org; stable@vger.kernel.org
主题: Re: [PATCH v3] usb: gadget: function: fix missing spinlock in f_uac1_legacy
On Sun, Jul 05, 2020 at 08:40:27PM +0800, qiang.zhang@windriver.com wrote:
> From: Zhang Qiang <qiang.zhang@windriver.com>
>
> Add a missing spinlock protection for play_queue, because
> the play_queue may be destroyed when the "playback_work"
> work func and "f_audio_out_ep_complete" callback func
> operate this paly_queue at the same time.
"play_queue", right?
>
> Cc: stable <stable@vger.kernel.org>
> Signed-off-by: Zhang Qiang <qiang.zhang@windriver.com>
Because you do not have a Fixes: tag in here, how far back do you want
the stable patch to go to? That's why, if you can, it's always good to
have a "Fixes:" tag in there to show what commit caused the problem you
are fixing here.
So, what commit caused this?
thanks,
gre gk-h
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: 回复: [PATCH v3] usb: gadget: function: fix missing spinlock in f_uac1_legacy
2020-07-07 2:28 ` 回复: " Zhang, Qiang
@ 2020-07-07 6:51 ` Greg KH
0 siblings, 0 replies; 5+ messages in thread
From: Greg KH @ 2020-07-07 6:51 UTC (permalink / raw)
To: Zhang, Qiang; +Cc: balbi, colin.king, linux-usb, linux-kernel, stable
A: http://en.wikipedia.org/wiki/Top_post
Q: Were do I find info about this thing called top-posting?
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?
A: No.
Q: Should I include quotations after my reply?
http://daringfireball.net/2007/07/on_top
On Tue, Jul 07, 2020 at 02:28:36AM +0000, Zhang, Qiang wrote:
> Hi Greg KH
> In the early submission:
> "commit id c6994e6f067cf0fc4c6cca3d164018b1150916f8" which add USB Audio Gadget driver "
> the "audio->play_queue" was protected from "audio->lock"
> spinlock in "playback_work" func, But in "f_audio_out_ep_complete" func
> there is no protection for the operation of this "audio->play_queue". there
> are missing spinlock, Fix tags should add up here commit?
I really do not understand what you are asking here, sorry.
greg k-h
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH v3] usb: gadget: function: fix missing spinlock in f_uac1_legacy
2020-07-05 12:40 [PATCH v3] usb: gadget: function: fix missing spinlock in f_uac1_legacy qiang.zhang
2020-07-06 19:55 ` Greg KH
@ 2020-07-07 8:35 ` Sergei Shtylyov
1 sibling, 0 replies; 5+ messages in thread
From: Sergei Shtylyov @ 2020-07-07 8:35 UTC (permalink / raw)
To: qiang.zhang, balbi; +Cc: colin.king, gregkh, linux-usb, linux-kernel, stable
On 05.07.2020 15:40, qiang.zhang@windriver.com wrote:
> From: Zhang Qiang <qiang.zhang@windriver.com>
>
> Add a missing spinlock protection for play_queue, because
> the play_queue may be destroyed when the "playback_work"
> work func and "f_audio_out_ep_complete" callback func
> operate this paly_queue at the same time.
It's play_queue. :-)
> Cc: stable <stable@vger.kernel.org>
> Signed-off-by: Zhang Qiang <qiang.zhang@windriver.com>
[...]
MBR, Sergei
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2020-07-07 8:35 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-07-05 12:40 [PATCH v3] usb: gadget: function: fix missing spinlock in f_uac1_legacy qiang.zhang
2020-07-06 19:55 ` Greg KH
2020-07-07 2:28 ` 回复: " Zhang, Qiang
2020-07-07 6:51 ` Greg KH
2020-07-07 8:35 ` Sergei Shtylyov
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.