linux-kernel - Re: USB gadget problem with close of a gadgetfs device

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Message-Id: <20090213083357.7F3B9446D8@ws5-1.us4.outblaze.com>
Date:	Fri, 13 Feb 2009 16:33:57 +0800
From:	"Erin Teran" <erin_teran@...uxmail.org>
To:	linux-kernel@...r.kernel.org
Cc:	postme1@....net, "USB list" <linux-usb@...r.kernel.org>,
	"Alan Stern" <stern@...land.harvard.edu>
Subject: Re: USB gadget problem with close of a gadgetfs device

Hello,

I couldnt find an answer to my question in the archive or the kernel documentation.
I'm new to Linux and the LKML so please point me in the right direction if the question is misplaced here.

I have a problem while using driver/usb/gadget/gadgetfs
Sometimes I cant reopen the device propperly. I get an -EBUSY.
Using atom_read(&fd->f_count) and printk() in inode.c dev_open I found out that the count is 1 when the failure occurs.
I checked several times if all fd I opened where closed, and they are.

Therefore I'm kinda lost here:
Q: Is f_count only increased after the dev_open returned success?
Q: Does poll() - which I use in my app - duplicate a fd and increase f_count?
Q: Is there a known issue with poll() and the pthread lib?
Q: What happens when I terminate a thread - pthread_cancel() - which is currently in a poll() call?

Thank you,
Erin

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