[PATCH 00/15] use permission-specific DEVICE_ATTR variants

Use DEVICE_ATTR_RO etc. for read only attributes etc.  This simplifies the
source code, improves readbility, and reduces the chance of
inconsistencies.

The complete semantic patch is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@ro@
declarer name DEVICE_ATTR;
identifier x,x_show;
@@

DEVICE_ATTR(x, \(0444\|S_IRUGO\), x_show, NULL);

@wo@
declarer name DEVICE_ATTR;
identifier x,x_store;
@@

DEVICE_ATTR(x, \(0200\|S_IWUSR\), NULL, x_store);

@rw@
declarer name DEVICE_ATTR;
identifier x,x_show,x_store;
@@

DEVICE_ATTR(x, \(0644\|S_IRUGO|S_IWUSR\), x_show, x_store);

@script:ocaml@
x << ro.x;
x_show << ro.x_show;
@@

if not (x^"_show" = x_show) then Coccilib.include_match false

@script:ocaml@
x << wo.x;
x_store << wo.x_store;
@@

if not (x^"_store" = x_store) then Coccilib.include_match false

@script:ocaml@
x << rw.x;
x_show << rw.x_show;
x_store << rw.x_store;
@@

if not (x^"_show" = x_show && x^"_store" = x_store)
then Coccilib.include_match false

@@
declarer name DEVICE_ATTR_RO;
identifier ro.x,ro.x_show;
@@

- DEVICE_ATTR(x, \(0444\|S_IRUGO\), x_show, NULL);
+ DEVICE_ATTR_RO(x);

@@
declarer name DEVICE_ATTR_WO;
identifier wo.x,wo.x_store;
@@

- DEVICE_ATTR(x, \(0200\|S_IWUSR\), NULL, x_store);
+ DEVICE_ATTR_WO(x);

@@
declarer name DEVICE_ATTR_RW;
identifier rw.x,rw.x_show,rw.x_store;
@@

- DEVICE_ATTR(x, \(0644\|S_IRUGO|S_IWUSR\), x_show, x_store);
+ DEVICE_ATTR_RW(x);
// </smpl>

---

 arch/mips/txx9/generic/7segled.c                  |    4 ++--
 arch/powerpc/kernel/iommu.c                       |    3 +--
 arch/tile/kernel/sysfs.c                          |   14 +++++++-------
 drivers/atm/solos-pci.c                           |    2 +-
 drivers/pci/pcie/aspm.c                           |    4 ++--
 drivers/power/supply/wm8350_power.c               |    2 +-
 drivers/ptp/ptp_sysfs.c                           |    2 +-
 drivers/thermal/int340x_thermal/int3400_thermal.c |    2 +-
 drivers/thermal/thermal_hwmon.c                   |    2 +-
 drivers/tty/nozomi.c                              |    4 ++--
 drivers/usb/wusbcore/dev-sysfs.c                  |    6 +++---
 drivers/usb/wusbcore/wusbhc.c                     |   13 +++++--------
 drivers/video/fbdev/wm8505fb.c                    |    2 +-
 sound/soc/omap/mcbsp.c                            |    4 ++--
 sound/soc/soc-dapm.c                              |    2 +-
 15 files changed, 31 insertions(+), 35 deletions(-)

Use DEVICE_ATTR_RW for read-write attributes.  This simplifies the
source code, improves readbility, and reduces the chance of
inconsistencies.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@rw@
declarer name DEVICE_ATTR;
identifier x,x_show,x_store;
@@

DEVICE_ATTR(x, \(0644\|S_IRUGO|S_IWUSR\), x_show, x_store);

@script:ocaml@
x << rw.x;
x_show << rw.x_show;
x_store << rw.x_store;
@@

if not (x^"_show" = x_show && x^"_store" = x_store)
then Coccilib.include_match false

@@
declarer name DEVICE_ATTR_RW;
identifier rw.x,rw.x_show,rw.x_store;
@@

- DEVICE_ATTR(x, \(0644\|S_IRUGO|S_IWUSR\), x_show, x_store);
+ DEVICE_ATTR_RW(x);
// </smpl>

Signed-off-by: Julia Lawall <redacted>

---
 arch/powerpc/kernel/iommu.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index 5f202a5..32f18b5 100644
--- a/arch/powerpc/kernel/iommu.c
+++ b/arch/powerpc/kernel/iommu.c

@@ -127,8 +127,7 @@ static ssize_t fail_iommu_store(struct device *dev,
 	return count;
 }
 
-static DEVICE_ATTR(fail_iommu, S_IRUGO|S_IWUSR, fail_iommu_show,
-		   fail_iommu_store);
+static DEVICE_ATTR_RW(fail_iommu);
 
 static int fail_iommu_bus_notify(struct notifier_block *nb,
 				 unsigned long action, void *data)

Julia Lawall [off-list ref] writes:

Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)


cheers

On Sat, 2016-10-29 at 19:37:02 UTC, Julia Lawall wrote:

Use DEVICE_ATTR_RW for read-write attributes.  This simplifies the
source code, improves readbility, and reduces the chance of
inconsistencies.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@rw@
declarer name DEVICE_ATTR;
identifier x,x_show,x_store;
@@

DEVICE_ATTR(x, \(0644\|S_IRUGO|S_IWUSR\), x_show, x_store);

@script:ocaml@
x << rw.x;
x_show << rw.x_show;
x_store << rw.x_store;
@@

if not (x^"_show" = x_show && x^"_store" = x_store)
then Coccilib.include_match false

@@
declarer name DEVICE_ATTR_RW;
identifier rw.x,rw.x_show,rw.x_store;
@@

- DEVICE_ATTR(x, \(0644\|S_IRUGO|S_IWUSR\), x_show, x_store);
+ DEVICE_ATTR_RW(x);
// </smpl>

Signed-off-by: Julia Lawall <redacted>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/8a7aef2cb3dafd2e8560750f4e5ad2

cheers