From: Felipe Balbi <balbi@kernel.org>
To: Peter Chen <peter.chen@kernel.org>,
Alan Stern <stern@rowland.harvard.edu>
Cc: USB mailing list <linux-usb@vger.kernel.org>
Subject: Re: Disconnect race in Gadget core
Date: Wed, 12 May 2021 12:41:42 +0300 [thread overview]
Message-ID: <8735us8f1l.fsf@kernel.org> (raw)
In-Reply-To: <20210512093748.GA17479@nchen>
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Hi,
Peter Chen <peter.chen@kernel.org> writes:
>> I suppose we could do something similar for the composite driver, for
>> gadgets that don't use configfs.
>
> Originally, I intended to do at composite.c to cover all gadget drivers, but
> I can't find a good way to use usb_composite_dev existing spinlock to do that.
> Since most of users already used configfs, I chose to fix it at configfs directly.
> If we want to fix it for legacy gadget drivers (drivers at drivers/usb/gadget/legacy/).
>
> For .setup & .suspend, we could delay 10ms after usb_gadget_disconnect, ensure
> hardware has triggered related interrupt, and we need to let all UDC drivers to
> add udc->gadget->irq, in that case, the pending threaded interrupt will be handled
> at synchronize_irq at usb_gadget_remove_driver.
> For .disconnect, we could use cdev->config to judge if the first .disconnect
> has run.
>
>> But what about legacy gadgets? Are
>> there any still around that don't use either configfs or the composite
>> framework?
>
> I only find raw_gadget.c that doesn't use composite framework, and it doesn't implement
> many usb_gadget_driver callbacks, eg, .disconnect and .suspend. For .setup, we could
> use above solutions for legacy composite driver.
IIRC the old EHCI debug gadget also fits the bill here.
--
balbi
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next prev parent reply other threads:[~2021-05-12 9:41 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-10 15:24 Disconnect race in Gadget core Alan Stern
2021-05-10 16:43 ` Felipe Balbi
2021-05-10 19:38 ` Alan Stern
2021-05-11 2:53 ` Peter Chen
2021-05-11 19:15 ` Alan Stern
2021-05-12 9:37 ` Peter Chen
2021-05-12 9:41 ` Felipe Balbi [this message]
2021-05-12 19:33 ` Alan Stern
2021-05-11 8:22 ` Felipe Balbi
2021-05-11 21:26 ` Alan Stern
2021-05-12 7:00 ` Felipe Balbi
2021-05-12 15:33 ` Alan Stern
2021-05-14 7:35 ` Felipe Balbi
2021-05-14 16:58 ` Alan Stern
2021-05-15 6:41 ` Felipe Balbi
2021-05-15 15:31 ` Alan Stern
2021-05-16 9:43 ` Felipe Balbi
2021-05-16 14:51 ` Alan Stern
2021-05-17 2:00 ` Peter Chen
2021-05-17 5:33 ` Felipe Balbi
2021-05-17 5:35 ` Felipe Balbi
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