linux-kernel - Re: gadgetfs broken since 7f7f25e8

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Message-ID: <55001AE3.3090207@ahsoftware.de>
Date:	Wed, 11 Mar 2015 11:37:23 +0100
From:	Alexander Holler <holler@...oftware.de>
To:	Alan Stern <stern@...land.harvard.edu>,
	Al Viro <viro@...IV.linux.org.uk>
CC:	Richard Weinberger <richard.weinberger@...il.com>,
	USB list <linux-usb@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>, Felipe Balbi <balbi@...com>
Subject: Re: gadgetfs broken since 7f7f25e8

Am 11.03.2015 um 11:29 schrieb Alexander Holler:
> Am 07.03.2015 um 12:23 schrieb Alexander Holler:
>
>> In detail it's only usable once (3.19). When unmounting it throws one or
>> two warnings because of too much puts (kernel/module.c:963, see below).
>> The result is that a subsequent mount afterwards fails because the old
>> instance is still busy (Resource temporarily unavailable).
>>
>> I haven't looked deeper into that problem up to now.
>>
>> Regards,
>>
>> Alexander Holler
>>
>>
>> [  151.425966] gadgetfs: USB Gadget filesystem, version 24 Aug 2004
>> [  151.479616] gadgetfs: bound to musb-hdrc driver
>> [  151.781095] gadgetfs: connected
>> [  151.785871] gadgetfs: disconnected
>> [  151.864187] gadgetfs: connected
>> [  151.873258] gadgetfs: configuration #1
>> [  151.962240] musb_g_ep0_irq 804: SETUP packet len 0 != 8 ?
>> [  155.065272] input:   USB Keyboard as
>> /devices/platform/ocp/47400000.usb/47401c00.usb/musb-hdrc.1.auto/usb2/2-1/2-1:1.0/0003:04D9:1603.0003/input/input2
>>
>>
>> [  155.119746] hid-generic 0003:04D9:1603.0003: input,hidraw0: USB HID
>> v1.10 Keyboard [  USB Keyboard] on usb-musb-hdrc.1.auto-1/input0
>> [  155.138194] input:   USB Keyboard as
>> /devices/platform/ocp/47400000.usb/47401c00.usb/musb-hdrc.1.auto/usb2/2-1/2-1:1.1/0003:04D9:1603.0004/input/input3
>>
>>
>> [  155.189783] hid-generic 0003:04D9:1603.0004: input,hidraw1: USB HID
>> v1.10 Device [  USB Keyboard] on usb-musb-hdrc.1.auto-1/input1
>> [  155.190002] gadgetfs: disconnected
>> [  155.190352] ------------[ cut here ]------------
>> [  155.190389] WARNING: CPU: 0 PID: 1290 at kernel/module.c:963
>> module_put+0x54/0x5c()
>> [  155.190396] Modules linked in: gadgetfs usb_f_ecm usb_f_rndis u_ether
>> libcomposite configfs ipv6 bnep bluetooth rfkill hid_generic tda998x
>> tilcdc drm_kms_helper ti_cpsw ptp drm usbhid pps_core davinci_cpdma
>> omap_mailbox cppi41 [last unloaded: g_ether]
>> [  155.190459] CPU: 0 PID: 1290 Comm: usb-mitm Not tainted
>> 3.19.0-bbb-00080-g5e25c2a #246
>> [  155.190466] Hardware name: Generic AM33XX (Flattened Device Tree)
>> [  155.190505] [<c00126f0>] (unwind_backtrace) from [<c00108d8>]
>> (show_stack+0x10/0x14)
>> [  155.190527] [<c00108d8>] (show_stack) from [<c002ef74>]
>> (warn_slowpath_common+0x80/0xa8)
>> [  155.190542] [<c002ef74>] (warn_slowpath_common) from [<c002f02c>]
>> (warn_slowpath_null+0x18/0x20)
>> [  155.190556] [<c002f02c>] (warn_slowpath_null) from [<c0069afc>]
>> (module_put+0x54/0x5c)
>> [  155.190581] [<c0069afc>] (module_put) from [<c00c3be0>]
>> (deactivate_locked_super+0x4c/0x64)
>> [  155.190598] [<c00c3be0>] (deactivate_locked_super) from [<c00d8d88>]
>> (cleanup_mnt+0x4c/0x6c)
>> [  155.190614] [<c00d8d88>] (cleanup_mnt) from [<c0041908>]
>> (task_work_run+0x8c/0xa4)
>> [  155.190628] [<c0041908>] (task_work_run) from [<c001059c>]
>> (do_work_pending+0x98/0xac)
>> [  155.190642] [<c001059c>] (do_work_pending) from [<c000dc04>]
>> (work_pending+0xc/0x20)
>> [  155.190649] ---[ end trace c3d57fca714062a3 ]---
>> --
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>
> That, BTW. is too a result of changing f_op dynamically. They will be
> changed from having no owner to having gadgetfs as owner.

Which fails since commit e513cc1c (3.19).

>
> Alexander Holler

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