[PATCH 2/2] device_attributes: add sysfs_attr_init() for dynamic attributes

[PATCH 2/2] device_attributes: add sysfs_attr_init() for dynamic attributes

[Wolfram Sang]

Made necessary by 6992f5334995af474c2b58d010d08bc597f0f2fe. Prevents further
"key xxx not in .data" bug-reports. Although some attributes could probably be
converted to static ones, this is left for people having hardware to test.

Found by this semantic patch:

@ init @
type T;
identifier A;
@@

        T {
                ...
                struct device_attribute A;
                ...
        };

@ main extends init @
expression E;
statement S;
identifier err;
T *name;
@@

        ... when != sysfs_attr_init(&name->A.attr);
(
+       sysfs_attr_init(&name->A.attr);
        if (device_create_file(E, &name->A))
                S
|
+       sysfs_attr_init(&name->A.attr);
        err = device_create_file(E, &name->A);
)

While reviewing, I put the initialization to apropriate places.

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Greg KH <gregkh@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
---
 drivers/macintosh/windfarm_core.c           |    1 +
 drivers/media/video/pvrusb2/pvrusb2-sysfs.c |    8 ++++++++
 drivers/platform/x86/intel_menlow.c         |    1 +
 drivers/video/fsl-diu-fb.c                  |    1 +
 4 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/drivers/macintosh/windfarm_core.c b/drivers/macintosh/windfarm_core.c
index 419795f..f447642 100644
--- a/drivers/macintosh/windfarm_core.c
+++ b/drivers/macintosh/windfarm_core.c
@@ -209,6 +209,7 @@ int wf_register_control(struct wf_control *new_ct)
 	kref_init(&new_ct->ref);
 	list_add(&new_ct->link, &wf_controls);
 
+	sysfs_attr_init(&new_ct->attr.attr);
 	new_ct->attr.attr.name = new_ct->name;
 	new_ct->attr.attr.mode = 0644;
 	new_ct->attr.show = wf_show_control;
diff --git a/drivers/media/video/pvrusb2/pvrusb2-sysfs.c b/drivers/media/video/pvrusb2/pvrusb2-sysfs.c
index 6c23456..71f5056 100644
--- a/drivers/media/video/pvrusb2/pvrusb2-sysfs.c
+++ b/drivers/media/video/pvrusb2/pvrusb2-sysfs.c
@@ -423,10 +423,12 @@ static void pvr2_sysfs_add_debugifc(struct pvr2_sysfs *sfp)
 
 	dip = kzalloc(sizeof(*dip),GFP_KERNEL);
 	if (!dip) return;
+	sysfs_attr_init(&dip->attr_debugcmd.attr);
 	dip->attr_debugcmd.attr.name = "debugcmd";
 	dip->attr_debugcmd.attr.mode = S_IRUGO|S_IWUSR|S_IWGRP;
 	dip->attr_debugcmd.show = debugcmd_show;
 	dip->attr_debugcmd.store = debugcmd_store;
+	sysfs_attr_init(&dip->attr_debuginfo.attr);
 	dip->attr_debuginfo.attr.name = "debuginfo";
 	dip->attr_debuginfo.attr.mode = S_IRUGO;
 	dip->attr_debuginfo.show = debuginfo_show;
@@ -644,6 +646,7 @@ static void class_dev_create(struct pvr2_sysfs *sfp,
 		return;
 	}
 
+	sysfs_attr_init(&sfp->attr_v4l_minor_number.attr);
 	sfp->attr_v4l_minor_number.attr.name = "v4l_minor_number";
 	sfp->attr_v4l_minor_number.attr.mode = S_IRUGO;
 	sfp->attr_v4l_minor_number.show = v4l_minor_number_show;
@@ -658,6 +661,7 @@ static void class_dev_create(struct pvr2_sysfs *sfp,
 		sfp->v4l_minor_number_created_ok = !0;
 	}
 
+	sysfs_attr_init(&sfp->attr_v4l_radio_minor_number.attr);
 	sfp->attr_v4l_radio_minor_number.attr.name = "v4l_radio_minor_number";
 	sfp->attr_v4l_radio_minor_number.attr.mode = S_IRUGO;
 	sfp->attr_v4l_radio_minor_number.show = v4l_radio_minor_number_show;
@@ -672,6 +676,7 @@ static void class_dev_create(struct pvr2_sysfs *sfp,
 		sfp->v4l_radio_minor_number_created_ok = !0;
 	}
 
+	sysfs_attr_init(&sfp->attr_unit_number.attr);
 	sfp->attr_unit_number.attr.name = "unit_number";
 	sfp->attr_unit_number.attr.mode = S_IRUGO;
 	sfp->attr_unit_number.show = unit_number_show;
@@ -685,6 +690,7 @@ static void class_dev_create(struct pvr2_sysfs *sfp,
 		sfp->unit_number_created_ok = !0;
 	}
 
+	sysfs_attr_init(&sfp->attr_bus_info.attr);
 	sfp->attr_bus_info.attr.name = "bus_info_str";
 	sfp->attr_bus_info.attr.mode = S_IRUGO;
 	sfp->attr_bus_info.show = bus_info_show;
@@ -699,6 +705,7 @@ static void class_dev_create(struct pvr2_sysfs *sfp,
 		sfp->bus_info_created_ok = !0;
 	}
 
+	sysfs_attr_init(&sfp->attr_hdw_name.attr);
 	sfp->attr_hdw_name.attr.name = "device_hardware_type";
 	sfp->attr_hdw_name.attr.mode = S_IRUGO;
 	sfp->attr_hdw_name.show = hdw_name_show;
@@ -713,6 +720,7 @@ static void class_dev_create(struct pvr2_sysfs *sfp,
 		sfp->hdw_name_created_ok = !0;
 	}
 
+	sysfs_attr_init(&sfp->attr_hdw_desc.attr);
 	sfp->attr_hdw_desc.attr.name = "device_hardware_description";
 	sfp->attr_hdw_desc.attr.mode = S_IRUGO;
 	sfp->attr_hdw_desc.show = hdw_desc_show;
diff --git a/drivers/platform/x86/intel_menlow.c b/drivers/platform/x86/intel_menlow.c
index f0a90a6..90ba5d7 100644
--- a/drivers/platform/x86/intel_menlow.c
+++ b/drivers/platform/x86/intel_menlow.c
@@ -396,6 +396,7 @@ static int intel_menlow_add_one_attribute(char *name, int mode, void *show,
 	if (!attr)
 		return -ENOMEM;
 
+	sysfs_attr_init(&attr->attr.attr); /* That is consistent naming :D */
 	attr->attr.attr.name = name;
 	attr->attr.attr.mode = mode;
 	attr->attr.show = show;
diff --git a/drivers/video/fsl-diu-fb.c b/drivers/video/fsl-diu-fb.c
index 4637bcb..994358a 100644
--- a/drivers/video/fsl-diu-fb.c
+++ b/drivers/video/fsl-diu-fb.c
@@ -1536,6 +1536,7 @@ static int __devinit fsl_diu_probe(struct of_device *ofdev,
 		goto error;
 	}
 
+	sysfs_attr_init(&machine_data->dev_attr.attr);
 	machine_data->dev_attr.attr.name = "monitor";
 	machine_data->dev_attr.attr.mode = S_IRUGO|S_IWUSR;
 	machine_data->dev_attr.show = show_monitor;
-- 
1.7.0

Re: [PATCH 2/2] device_attributes: add sysfs_attr_init() for dynamic attributes

[Mauro Carvalho Chehab]

Wolfram Sang wrote:
> Made necessary by 6992f5334995af474c2b58d010d08bc597f0f2fe. Prevents further
> "key xxx not in .data" bug-reports. Although some attributes could probably be
> converted to static ones, this is left for people having hardware to test.
> 
> Found by this semantic patch:
> 
> @ init @
> type T;
> identifier A;
> @@
> 
>         T {
>                 ...
>                 struct device_attribute A;
>                 ...
>         };
> 
> @ main extends init @
> expression E;
> statement S;
> identifier err;
> T *name;
> @@
> 
>         ... when != sysfs_attr_init(&name->A.attr);
> (
> +       sysfs_attr_init(&name->A.attr);
>         if (device_create_file(E, &name->A))
>                 S
> |
> +       sysfs_attr_init(&name->A.attr);
>         err = device_create_file(E, &name->A);
> )
> 
> While reviewing, I put the initialization to apropriate places.
> 
> Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
> Cc: Eric W. Biederman <ebiederm@xmission.com>
> Cc: Greg KH <gregkh@suse.de>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> ---
>  drivers/macintosh/windfarm_core.c           |    1 +
>  drivers/media/video/pvrusb2/pvrusb2-sysfs.c |    8 ++++++++

I suspect that several (if not all) occurrences at pvrusb2 could be replaced by
static attributes, but let Mike Isely have the final word on that, as the driver
maintainer. From my side, I'm ok with either options.

Cheers,
Mauro