Re: [PATCH] staging: comedi: replace slash in name

[Ian Abbott]

On 15/03/2021 20:00, Tong Zhang wrote:
> Thanks Ian,
> I have submitted a v2 patch based on your suggestions.
> Thanks,
> - Tong

Thanks.  I think the only other Comedi driver with the same problem is 
"drivers/staging/comedi/drivers/das800.c".  It passes dev->board_name as 
the name argument of request_irq(), but that is "cio-das802/16" for one 
of the boards supported by the driver.

> On Mon, Mar 15, 2021 at 6:48 AM Ian Abbott <abbotti@xxxxxxxxx> wrote:
> > 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@xxxxxxxxx>
> > [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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