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Message-Id: <20211011061117.21435-1-nikita.yoush@cogentembedded.com>
Date: Mon, 11 Oct 2021 09:11:18 +0300
From: Nikita Yushchenko <nikita.yoush@...entembedded.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Christian Gromm <christian.gromm@...rochip.com>,
Lee Jones <lee.jones@...aro.org>
Cc: linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
Nikita Yushchenko <nikita.yoush@...entembedded.com>
Subject: [PATCH v2 1/2] staging: most: dim2: do not double-register the same device
Commit 723de0f9171e ("staging: most: remove device from interface
structure") moved registration of driver-provided struct device to
the most subsystem.
Dim2 used to register the same struct device to provide a custom device
attribute. This causes double-registration of the same struct device.
Fix that by moving the custom attribute to driver's dev_groups.
This moves attribute to the platform_device object, which is a better
location for platform-specific attributes anyway.
Fixes: 723de0f9171e ("staging: most: remove device from interface structure")
Signed-off-by: Nikita Yushchenko <nikita.yoush@...entembedded.com>
---
Changes from v1:
- use ATTRIBUTE_GROUPS()
- use sysfs_emit()
drivers/staging/most/dim2/Makefile | 2 +-
drivers/staging/most/dim2/dim2.c | 24 ++++++++-------
drivers/staging/most/dim2/sysfs.c | 49 ------------------------------
drivers/staging/most/dim2/sysfs.h | 11 -------
4 files changed, 14 insertions(+), 72 deletions(-)
delete mode 100644 drivers/staging/most/dim2/sysfs.c
diff --git a/drivers/staging/most/dim2/Makefile b/drivers/staging/most/dim2/Makefile
index 861adacf6c72..5f9612af3fa3 100644
--- a/drivers/staging/most/dim2/Makefile
+++ b/drivers/staging/most/dim2/Makefile
@@ -1,4 +1,4 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_MOST_DIM2) += most_dim2.o
-most_dim2-objs := dim2.o hal.o sysfs.o
+most_dim2-objs := dim2.o hal.o
diff --git a/drivers/staging/most/dim2/dim2.c b/drivers/staging/most/dim2/dim2.c
index e8b03fa90e80..96cb5280a385 100644
--- a/drivers/staging/most/dim2/dim2.c
+++ b/drivers/staging/most/dim2/dim2.c
@@ -118,7 +118,8 @@ struct dim2_platform_data {
(((p)[1] == 0x18) && ((p)[2] == 0x05) && ((p)[3] == 0x0C) && \
((p)[13] == 0x3C) && ((p)[14] == 0x00) && ((p)[15] == 0x0A))
-bool dim2_sysfs_get_state_cb(void)
+static ssize_t state_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
{
bool state;
unsigned long flags;
@@ -127,9 +128,18 @@ bool dim2_sysfs_get_state_cb(void)
state = dim_get_lock_state();
spin_unlock_irqrestore(&dim_lock, flags);
- return state;
+ return sysfs_emit(buf, "%s\n", state ? "locked" : "");
}
+static DEVICE_ATTR_RO(state);
+
+static struct attribute *dim2_attrs[] = {
+ &dev_attr_state.attr,
+ NULL,
+};
+
+ATTRIBUTE_GROUPS(dim2);
+
/**
* dimcb_on_error - callback from HAL to report miscommunication between
* HDM and HAL
@@ -874,16 +884,8 @@ static int dim2_probe(struct platform_device *pdev)
goto err_stop_thread;
}
- ret = dim2_sysfs_probe(&dev->dev);
- if (ret) {
- dev_err(&pdev->dev, "failed to create sysfs attribute\n");
- goto err_unreg_iface;
- }
-
return 0;
-err_unreg_iface:
- most_deregister_interface(&dev->most_iface);
err_stop_thread:
kthread_stop(dev->netinfo_task);
err_shutdown_dim:
@@ -906,7 +908,6 @@ static int dim2_remove(struct platform_device *pdev)
struct dim2_hdm *dev = platform_get_drvdata(pdev);
unsigned long flags;
- dim2_sysfs_destroy(&dev->dev);
most_deregister_interface(&dev->most_iface);
kthread_stop(dev->netinfo_task);
@@ -1100,6 +1101,7 @@ static struct platform_driver dim2_driver = {
.driver = {
.name = "hdm_dim2",
.of_match_table = dim2_of_match,
+ .dev_groups = dim2_groups,
},
};
diff --git a/drivers/staging/most/dim2/sysfs.c b/drivers/staging/most/dim2/sysfs.c
deleted file mode 100644
index c85b2cdcdca3..000000000000
--- a/drivers/staging/most/dim2/sysfs.c
+++ /dev/null
@@ -1,49 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * sysfs.c - MediaLB sysfs information
- *
- * Copyright (C) 2015, Microchip Technology Germany II GmbH & Co. KG
- */
-
-/* Author: Andrey Shvetsov <andrey.shvetsov@....de> */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/kernel.h>
-#include "sysfs.h"
-#include <linux/device.h>
-
-static ssize_t state_show(struct device *dev, struct device_attribute *attr,
- char *buf)
-{
- bool state = dim2_sysfs_get_state_cb();
-
- return sprintf(buf, "%s\n", state ? "locked" : "");
-}
-
-static DEVICE_ATTR_RO(state);
-
-static struct attribute *dev_attrs[] = {
- &dev_attr_state.attr,
- NULL,
-};
-
-static struct attribute_group dev_attr_group = {
- .attrs = dev_attrs,
-};
-
-static const struct attribute_group *dev_attr_groups[] = {
- &dev_attr_group,
- NULL,
-};
-
-int dim2_sysfs_probe(struct device *dev)
-{
- dev->groups = dev_attr_groups;
- return device_register(dev);
-}
-
-void dim2_sysfs_destroy(struct device *dev)
-{
- device_unregister(dev);
-}
diff --git a/drivers/staging/most/dim2/sysfs.h b/drivers/staging/most/dim2/sysfs.h
index 24277a17cff3..09115cf4ed00 100644
--- a/drivers/staging/most/dim2/sysfs.h
+++ b/drivers/staging/most/dim2/sysfs.h
@@ -16,15 +16,4 @@ struct medialb_bus {
struct kobject kobj_group;
};
-struct device;
-
-int dim2_sysfs_probe(struct device *dev);
-void dim2_sysfs_destroy(struct device *dev);
-
-/*
- * callback,
- * must deliver MediaLB state as true if locked or false if unlocked
- */
-bool dim2_sysfs_get_state_cb(void);
-
#endif /* DIM2_SYSFS_H */
--
2.30.2
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