linux-kernel - Re: [PATCH v2 2/2] iio: imu: adis16460: use DEFINE_DEBUGFS_ATTRIBUTE instead of DEFINE_SIMPLE

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Date:   Sat, 4 Apr 2020 16:34:08 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     "Sa, Nuno" <Nuno.Sa@...log.com>
Cc:     Rohit Sarkar <rohitsarkar5398@...il.com>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "Bogdan, Dragos" <Dragos.Bogdan@...log.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        "Hennerich, Michael" <Michael.Hennerich@...log.com>,
        Stefan Popa <stefan.popa@...log.com>,
        Hartmut Knaack <knaack.h@....de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] iio: imu: adis16460: use
 DEFINE_DEBUGFS_ATTRIBUTE instead of DEFINE_SIMPLE_ATTRIBUTE

On Tue, 31 Mar 2020 15:28:22 +0000
"Sa, Nuno" <Nuno.Sa@...log.com> wrote:

> > From: linux-iio-owner@...r.kernel.org <linux-iio-owner@...r.kernel.org> On
> > Behalf Of Rohit Sarkar
> > Sent: Dienstag, 31. März 2020 13:48
> > To: linux-iio@...r.kernel.org
> > Cc: Bogdan, Dragos <Dragos.Bogdan@...log.com>; Rohit Sarkar
> > <rohitsarkar5398@...il.com>; Lars-Peter Clausen <lars@...afoo.de>;
> > Hennerich, Michael <Michael.Hennerich@...log.com>; Stefan Popa
> > <stefan.popa@...log.com>; Jonathan Cameron <jic23@...nel.org>; Hartmut
> > Knaack <knaack.h@....de>; Peter Meerwald-Stadler
> > <pmeerw@...erw.net>; linux-kernel@...r.kernel.org
> > Subject: [PATCH v2 2/2] iio: imu: adis16460: use
> > DEFINE_DEBUGFS_ATTRIBUTE instead of DEFINE_SIMPLE_ATTRIBUTE
> > 
> > debugfs_create_file_unsafe does not protect the fops handed to it
> > against file removal. DEFINE_DEBUGFS_ATTRIBUTE makes the fops aware of
> > the file lifetime and thus protects it against removal.
> > 
> > Signed-off-by: Rohit Sarkar <rohitsarkar5398@...il.com>
> > ---
> >  drivers/iio/imu/adis16460.c | 27 +++++++++++++++------------
> >  1 file changed, 15 insertions(+), 12 deletions(-)
> > 
> > diff --git a/drivers/iio/imu/adis16460.c b/drivers/iio/imu/adis16460.c
> > index 9539cfe4a259..f96cfd007957 100644
> > --- a/drivers/iio/imu/adis16460.c
> > +++ b/drivers/iio/imu/adis16460.c
> > @@ -87,8 +87,8 @@ static int adis16460_show_serial_number(void *arg,
> > u64 *val)
> > 
> >  	return 0;
> >  }
> > -DEFINE_SIMPLE_ATTRIBUTE(adis16460_serial_number_fops,
> > -	adis16460_show_serial_number, NULL, "0x%.4llx\n");
> > +DEFINE_DEBUGFS_ATTRIBUTE(adis16460_serial_number_fops,
> > +		adis16460_show_serial_number, NULL, "0x%.4llx\n");
> > 
> >  static int adis16460_show_product_id(void *arg, u64 *val)
> >  {
> > @@ -105,8 +105,8 @@ static int adis16460_show_product_id(void *arg, u64
> > *val)
> > 
> >  	return 0;
> >  }
> > -DEFINE_SIMPLE_ATTRIBUTE(adis16460_product_id_fops,
> > -	adis16460_show_product_id, NULL, "%llu\n");
> > +DEFINE_DEBUGFS_ATTRIBUTE(adis16460_product_id_fops,
> > +		adis16460_show_product_id, NULL, "%llu\n");
> > 
> >  static int adis16460_show_flash_count(void *arg, u64 *val)
> >  {
> > @@ -123,19 +123,22 @@ static int adis16460_show_flash_count(void *arg,
> > u64 *val)
> > 
> >  	return 0;
> >  }
> > -DEFINE_SIMPLE_ATTRIBUTE(adis16460_flash_count_fops,
> > -	adis16460_show_flash_count, NULL, "%lld\n");
> > +DEFINE_DEBUGFS_ATTRIBUTE(adis16460_flash_count_fops,
> > +		adis16460_show_flash_count, NULL, "%lld\n");
> > 
> >  static int adis16460_debugfs_init(struct iio_dev *indio_dev)
> >  {
> >  	struct adis16460 *adis16460 = iio_priv(indio_dev);
> > 
> > -	debugfs_create_file("serial_number", 0400, indio_dev-  
> > >debugfs_dentry,  
> > -		adis16460, &adis16460_serial_number_fops);
> > -	debugfs_create_file("product_id", 0400, indio_dev->debugfs_dentry,
> > -		adis16460, &adis16460_product_id_fops);
> > -	debugfs_create_file("flash_count", 0400, indio_dev->debugfs_dentry,
> > -		adis16460, &adis16460_flash_count_fops);
> > +	debugfs_create_file_unsafe("serial_number", 0400,
> > +			indio_dev->debugfs_dentry, adis16460,
> > +			&adis16460_serial_number_fops);
> > +	debugfs_create_file_unsafe("product_id", 0400,
> > +			indio_dev->debugfs_dentry, adis16460,
> > +			&adis16460_product_id_fops);
> > +	debugfs_create_file_unsafe("flash_count", 0400,
> > +			indio_dev->debugfs_dentry, adis16460,
> > +			&adis16460_flash_count_fops);
> > 
> >  	return 0;
> >  }  
> 
> Tested-by Nuno Sá <nuno.sa@...log.com>
Applied.  Thanks,

Jonathan

> 
> > --
> > 2.23.0.385.gbc12974a89  
>