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Subject: Re: [PATCH] staging: comedi: replace slash in name
From:   Ian Abbott <abbotti@mev.co.uk>
To:     Tong Zhang <ztong0001@gmail.com>,
        H Hartley Sweeten <hsweeten@visionengravers.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Alexander A. Klimov" <grandmaster@al2klimov.de>,
        devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org
References: <20210314035757.2740146-1-ztong0001@gmail.com>
 <5d7a5e1c-35ab-58cb-ebcd-da5b280c802e@mev.co.uk>
Organization: MEV Ltd.
Message-ID: <858341a6-c105-1440-aa4d-ea0217f2ec89@mev.co.uk>
Date:   Mon, 15 Mar 2021 10:48:38 +0000
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On 15/03/2021 10:44, Ian Abbott wrote:
> On 14/03/2021 03:57, Tong Zhang wrote:
>> request_irq() wont accept a name which contains slash so we need to
>> repalce it with something else -- otherwise it will trigger a warning
>> and the entry in /proc/irq/ will not be created
>>
>> [    1.565966] name 'pci-das6402/16'
>> [    1.566149] WARNING: CPU: 0 PID: 184 at fs/proc/generic.c:180 __xlate_proc_name+0x93/0xb0
>> [    1.568923] RIP: 0010:__xlate_proc_name+0x93/0xb0
>> [    1.574200] Call Trace:
>> [    1.574722]  proc_mkdir+0x18/0x20
>> [    1.576629]  request_threaded_irq+0xfe/0x160
>> [    1.576859]  auto_attach+0x60a/0xc40 [cb_pcidas64]
>>
>> Signed-off-by: Tong Zhang <ztong0001@gmail.com>
[snip]
> Userspace applications can use these strings to determine the board
> type, so changing the strings would break those applications.
> 
> I suggest passing the comedi driver name "cb_pcidas" to request_irq()
> for now.

Oops, I meant "cb_pcidas64".  But you could reach that via
dev->driver->driver_name if you want (where dev is the struct
comedi_device * parameter).

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