[PATCH v5 1/5] rtc: sysfs: facilitate attribute add to rtc device
From: Denis Osterland
This patches addresses following problem:
rtc_allocate_device
devm_device_add_group <-- kernel oops / null pointer, because
sysfs entry does not yet exist
rtc_register_device
rc = devm_device_add_group
if (rc)
return rc; <-- forbidden to return error code
after device register
This patch adds rtc_add_group(s) functions.
The functions store the sum of attribute groups as device resource.
Signed-off-by: Denis Osterland
---
drivers/rtc/rtc-core.h | 13 +
drivers/rtc/rtc-sysfs.c | 43 +
2 files changed, 56 insertions(+)
diff --git a/drivers/rtc/rtc-core.h b/drivers/rtc/rtc-core.h
index 0abf98983e13..c74537d03644 100644
--- a/drivers/rtc/rtc-core.h
+++ b/drivers/rtc/rtc-core.h
@@ -40,9 +40,22 @@ static inline void rtc_proc_del_device(struct rtc_device
*rtc)
#ifdef CONFIG_RTC_INTF_SYSFS
const struct attribute_group **rtc_get_dev_attribute_groups(void);
+int rtc_add_group(struct rtc_device *rtc, const struct attribute_group *grp);
+int rtc_add_groups(struct rtc_device *rtc,
+ const struct attribute_group **grps);
#else
static inline const struct attribute_group **rtc_get_dev_attribute_groups(void)
{
return NULL;
}
+static inline
+int rtc_add_group(struct rtc_device *rtc, const struct attribute_group *grp)
+{
+ return 0;
+}
+static inline
+int rtc_add_groups(struct rtc_device *rtc, const struct attribute_group **grps)
+{
+ return 0;
+}
#endif
diff --git a/drivers/rtc/rtc-sysfs.c b/drivers/rtc/rtc-sysfs.c
index 454da38c6012..498e65f13686 100644
--- a/drivers/rtc/rtc-sysfs.c
+++ b/drivers/rtc/rtc-sysfs.c
@@ -317,3 +317,46 @@ const struct attribute_group
**rtc_get_dev_attribute_groups(void)
{
return rtc_attr_groups;
}
+
+int rtc_add_groups(struct rtc_device *rtc, const struct attribute_group **grps)
+{
+ size_t old_cnt = 0, add_cnt = 0, new_cnt;
+ const struct attribute_group **groups, **old;
+
+ if (rtc->registered)
+ return -EINVAL;
+ if (!grps)
+ return -EINVAL;
+
+ groups = rtc->dev.groups;
+ if (groups)
+ for (; *groups; groups++)
+ old_cnt++;
+
+ for (groups = grps; *groups; groups++)
+ add_cnt++;
+
+ new_cnt = old_cnt + add_cnt + 1;
+ groups = devm_kcalloc(>dev, new_cnt, sizeof(*groups), GFP_KERNEL);
+ if (IS_ERR_OR_NULL(groups))
+ return PTR_ERR(groups);
+ memcpy(groups, rtc->dev.groups, old_cnt*sizeof(*groups));
+ memcpy(groups+old_cnt, grps, add_cnt*sizeof(*groups));
+ groups[old_cnt+add_cnt] = NULL;
+
+ old = rtc->dev.groups;
+ rtc->dev.groups = groups;
+ if (old && old != rtc_attr_groups)
+ devm_kfree(>dev, old);
+
+ return 0;
+}
+EXPORT_SYMBOL(rtc_add_groups);
+
+int rtc_add_group(struct rtc_device *rtc, const struct attribute_group *grp)
+{
+ const struct attribute_group *groups[] = { grp, NULL };
+
+ return rtc_add_groups(rtc, groups);
+}
+EXPORT_SYMBOL(rtc_add_group);
--
2.18.0
Diehl Connectivity Solutions GmbH
Geschäftsführung: Horst Leonberger
Sitz der Gesellschaft: Nürnberg - Registergericht: Amtsgericht
Nürnberg: HRB 32315
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[PATCH v5 1/5] rtc: sysfs: facilitate attribute add to rtc device
From: Denis Osterland
This patches addresses following problem:
rtc_allocate_device
devm_device_add_group <-- kernel oops / null pointer, because
sysfs entry does not yet exist
rtc_register_device
rc = devm_device_add_group
if (rc)
return rc; <-- forbidden to return error code
after device register
This patch adds rtc_add_group(s) functions.
The functions store the sum of attribute groups as device resource.
Signed-off-by: Denis Osterland
---
drivers/rtc/rtc-core.h | 13 +
drivers/rtc/rtc-sysfs.c | 43 +
2 files changed, 56 insertions(+)
diff --git a/drivers/rtc/rtc-core.h b/drivers/rtc/rtc-core.h
index 0abf98983e13..c74537d03644 100644
--- a/drivers/rtc/rtc-core.h
+++ b/drivers/rtc/rtc-core.h
@@ -40,9 +40,22 @@ static inline void rtc_proc_del_device(struct rtc_device
*rtc)
#ifdef CONFIG_RTC_INTF_SYSFS
const struct attribute_group **rtc_get_dev_attribute_groups(void);
+int rtc_add_group(struct rtc_device *rtc, const struct attribute_group *grp);
+int rtc_add_groups(struct rtc_device *rtc,
+ const struct attribute_group **grps);
#else
static inline const struct attribute_group **rtc_get_dev_attribute_groups(void)
{
return NULL;
}
+static inline
+int rtc_add_group(struct rtc_device *rtc, const struct attribute_group *grp)
+{
+ return 0;
+}
+static inline
+int rtc_add_groups(struct rtc_device *rtc, const struct attribute_group **grps)
+{
+ return 0;
+}
#endif
diff --git a/drivers/rtc/rtc-sysfs.c b/drivers/rtc/rtc-sysfs.c
index 454da38c6012..498e65f13686 100644
--- a/drivers/rtc/rtc-sysfs.c
+++ b/drivers/rtc/rtc-sysfs.c
@@ -317,3 +317,46 @@ const struct attribute_group
**rtc_get_dev_attribute_groups(void)
{
return rtc_attr_groups;
}
+
+int rtc_add_groups(struct rtc_device *rtc, const struct attribute_group **grps)
+{
+ size_t old_cnt = 0, add_cnt = 0, new_cnt;
+ const struct attribute_group **groups, **old;
+
+ if (rtc->registered)
+ return -EINVAL;
+ if (!grps)
+ return -EINVAL;
+
+ groups = rtc->dev.groups;
+ if (groups)
+ for (; *groups; groups++)
+ old_cnt++;
+
+ for (groups = grps; *groups; groups++)
+ add_cnt++;
+
+ new_cnt = old_cnt + add_cnt + 1;
+ groups = devm_kcalloc(>dev, new_cnt, sizeof(*groups), GFP_KERNEL);
+ if (IS_ERR_OR_NULL(groups))
+ return PTR_ERR(groups);
+ memcpy(groups, rtc->dev.groups, old_cnt*sizeof(*groups));
+ memcpy(groups+old_cnt, grps, add_cnt*sizeof(*groups));
+ groups[old_cnt+add_cnt] = NULL;
+
+ old = rtc->dev.groups;
+ rtc->dev.groups = groups;
+ if (old && old != rtc_attr_groups)
+ devm_kfree(>dev, old);
+
+ return 0;
+}
+EXPORT_SYMBOL(rtc_add_groups);
+
+int rtc_add_group(struct rtc_device *rtc, const struct attribute_group *grp)
+{
+ const struct attribute_group *groups[] = { grp, NULL };
+
+ return rtc_add_groups(rtc, groups);
+}
+EXPORT_SYMBOL(rtc_add_group);
--
2.18.0
Diehl Connectivity Solutions GmbH
Geschäftsführung: Horst Leonberger
Sitz der Gesellschaft: Nürnberg - Registergericht: Amtsgericht
Nürnberg: HRB 32315
___
Der Inhalt der vorstehenden E-Mail ist nicht rechtlich bindend. Diese E-Mail
enthaelt vertrauliche und/oder rechtlich geschuetzte Informationen.
Informieren Sie uns bitte, wenn Sie diese E-Mail faelschlicherweise erhalten
haben. Bitte loeschen Sie in diesem Fall die Nachricht.
Jede unerlaubte Form der Reproduktion, Bekanntgabe, Aenderung, Verteilung
und/oder Publikation dieser E-Mail ist strengstens untersagt.
The contents of the above mentioned e-mail is not legally binding. This e-mail
contains confidential and/or legally protected information. Please inform us if
you have received this e-mail by
mistake and delete it in such a case. Each unauthorized reproduction,
disclosure, alteration, distribution and/or publication of this e-mail is
strictly prohibited.
