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SubjectRe: [PATCH] USB:gadget: Fix a warning while loading g_mass_storage
On 06/15/2014 10:42 AM, Yang,Wei wrote:
> Its v4, sorry for missing it in subject.

Alan, How about this version?

Cheers
Wei
>
> Regards
> Wei
> On 06/15/2014 10:40 AM, Wei.Yang@windriver.com wrote:
>> From: Yang Wei <Wei.Yang@windriver.com>
>>
>> While loading g_mass_storage module, the following warning
>> is triggered.
>>
>> WARNING: at drivers/usb/gadget/composite.c:
>> usb_composite_setup_continue: Unexpected call
>> Modules linked in: fat vfat minix nls_cp437 nls_iso8859_1 g_mass_storage
>> [<800179cc>] (unwind_backtrace+0x0/0x104) from [<80619608>]
>> (dump_stack+0x20/0x24)
>> [<80619608>] (dump_stack+0x20/0x24) from [<80025100>]
>> (warn_slowpath_common+0x64/0x74)
>> [<80025100>] (warn_slowpath_common+0x64/0x74) from [<800251cc>]
>> (warn_slowpath_fmt+0x40/0x48)
>> [<800251cc>] (warn_slowpath_fmt+0x40/0x48) from [<7f047774>]
>> (usb_composite_setup_continue+0xb4/0xbc [g_mass_storage])
>> [<7f047774>] (usb_composite_setup_continue+0xb4/0xbc
>> [g_mass_storage]) from [<7f047ad4>] (handle_exception+0x358/0x3e4
>> [g_mass_storage])
>> [<7f047ad4>] (handle_exception+0x358/0x3e4 [g_mass_storage]) from
>> [<7f048080>] (fsg_main_thread+0x520/0x157c [g_mass_storage])
>> [<7f048080>] (fsg_main_thread+0x520/0x157c [g_mass_storage]) from
>> [<8004bc90>] (kthread+0x98/0x9c)
>> [<8004bc90>] (kthread+0x98/0x9c) from [<8000faec>]
>> (kernel_thread_exit+0x0/0x8)
>>
>> The root cause is that the existing code fails to take into
>> account the possibility that common->new_fsg can change while
>> do_set_interface() is running, so the value of common->new_fsg
>> that gets tested after do_set_interface returns needs to be
>> the same as the value used by do_set_interface.
>>
>> Signed-off-by: Yang Wei <Wei.Yang@windriver.com>
>> Acked-by: Alan Stern <stern@rowland.harvard.edu>
>> ---
>> drivers/usb/gadget/f_mass_storage.c | 6 ++++--
>> 1 file changed, 4 insertions(+), 2 deletions(-)
>>
>> Changes in v3 ----> v4
>>
>> move "new_fsg = common->new_fsg" out of comm->lock protection, and
>> refine the commit log.
>>
>> Thanks
>> Wei
>>
>> diff --git a/drivers/usb/gadget/f_mass_storage.c
>> b/drivers/usb/gadget/f_mass_storage.c
>> index b963939..a7e24c8 100644
>> --- a/drivers/usb/gadget/f_mass_storage.c
>> +++ b/drivers/usb/gadget/f_mass_storage.c
>> @@ -2342,6 +2342,7 @@ static void handle_exception(struct fsg_common
>> *common)
>> struct fsg_buffhd *bh;
>> enum fsg_state old_state;
>> struct fsg_lun *curlun;
>> + struct fsg_dev *new_fsg;
>> unsigned int exception_req_tag;
>> /*
>> @@ -2460,8 +2461,9 @@ static void handle_exception(struct fsg_common
>> *common)
>> break;
>> case FSG_STATE_CONFIG_CHANGE:
>> - do_set_interface(common, common->new_fsg);
>> - if (common->new_fsg)
>> + new_fsg = common->new_fsg;
>> + do_set_interface(common, new_fsg);
>> + if (new_fsg)
>> usb_composite_setup_continue(common->cdev);
>> break;
>
>
>



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