* [PATCH AUTOSEL 4.19 180/191] rtc: isl1208: avoid possible sysfs race
[not found] <20191110024013.29782-1-sashal@kernel.org>
@ 2019-11-10 2:40 ` Sasha Levin
2019-11-10 2:40 ` [PATCH AUTOSEL 4.19 181/191] rtc: tx4939: fixup nvmem name and register size Sasha Levin
2019-11-10 2:40 ` [PATCH AUTOSEL 4.19 182/191] rtc: armada38x: fix possible race condition Sasha Levin
2 siblings, 0 replies; 3+ messages in thread
From: Sasha Levin @ 2019-11-10 2:40 UTC (permalink / raw)
To: linux-kernel, stable
Cc: Alexandre Belloni, Denis Osterland, Sasha Levin, linux-rtc
From: Alexandre Belloni <alexandre.belloni@bootlin.com>
[ Upstream commit 1b4c794fda583edabe864ac466e9cd43c707be80 ]
Use rtc_add_group to add the common sysfs group to avoid a possible race
condition.
[Denis.Osterland@diehl.com: use to_i2c_client(dev->parent)]
Signed-off-by: Denis Osterland <Denis.Osterland@diehl.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
The move of atrim, dtrim usr sysfs properties from i2c device
to rtc device require to access them via dev->parent.
This patch also aligns timestamp0.
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/rtc/rtc-isl1208.c | 27 ++++++++++-----------------
1 file changed, 10 insertions(+), 17 deletions(-)
diff --git a/drivers/rtc/rtc-isl1208.c b/drivers/rtc/rtc-isl1208.c
index ea18a8f4bce06..033f65aef5788 100644
--- a/drivers/rtc/rtc-isl1208.c
+++ b/drivers/rtc/rtc-isl1208.c
@@ -518,7 +518,7 @@ static ssize_t timestamp0_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
- struct i2c_client *client = dev_get_drvdata(dev);
+ struct i2c_client *client = to_i2c_client(dev->parent);
int sr;
sr = isl1208_i2c_get_sr(client);
@@ -540,7 +540,7 @@ static ssize_t timestamp0_store(struct device *dev,
static ssize_t timestamp0_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct i2c_client *client = dev_get_drvdata(dev);
+ struct i2c_client *client = to_i2c_client(dev->parent);
u8 regs[ISL1219_EVT_SECTION_LEN] = { 0, };
struct rtc_time tm;
int sr;
@@ -650,7 +650,7 @@ static ssize_t
isl1208_sysfs_show_atrim(struct device *dev,
struct device_attribute *attr, char *buf)
{
- int atr = isl1208_i2c_get_atr(to_i2c_client(dev));
+ int atr = isl1208_i2c_get_atr(to_i2c_client(dev->parent));
if (atr < 0)
return atr;
@@ -663,7 +663,7 @@ static ssize_t
isl1208_sysfs_show_dtrim(struct device *dev,
struct device_attribute *attr, char *buf)
{
- int dtr = isl1208_i2c_get_dtr(to_i2c_client(dev));
+ int dtr = isl1208_i2c_get_dtr(to_i2c_client(dev->parent));
if (dtr < 0)
return dtr;
@@ -676,7 +676,7 @@ static ssize_t
isl1208_sysfs_show_usr(struct device *dev,
struct device_attribute *attr, char *buf)
{
- int usr = isl1208_i2c_get_usr(to_i2c_client(dev));
+ int usr = isl1208_i2c_get_usr(to_i2c_client(dev->parent));
if (usr < 0)
return usr;
@@ -701,7 +701,10 @@ isl1208_sysfs_store_usr(struct device *dev,
if (usr < 0 || usr > 0xffff)
return -EINVAL;
- return isl1208_i2c_set_usr(to_i2c_client(dev), usr) ? -EIO : count;
+ if (isl1208_i2c_set_usr(to_i2c_client(dev->parent), usr))
+ return -EIO;
+
+ return count;
}
static DEVICE_ATTR(usr, S_IRUGO | S_IWUSR, isl1208_sysfs_show_usr,
@@ -765,7 +768,6 @@ isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id)
rtc->ops = &isl1208_rtc_ops;
i2c_set_clientdata(client, rtc);
- dev_set_drvdata(&rtc->dev, client);
rc = isl1208_i2c_get_sr(client);
if (rc < 0) {
@@ -804,7 +806,7 @@ isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id)
evdet_irq = of_irq_get_byname(np, "evdet");
}
- rc = sysfs_create_group(&client->dev.kobj, &isl1208_rtc_sysfs_files);
+ rc = rtc_add_group(rtc, &isl1208_rtc_sysfs_files);
if (rc)
return rc;
@@ -821,14 +823,6 @@ isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id)
return rtc_register_device(rtc);
}
-static int
-isl1208_remove(struct i2c_client *client)
-{
- sysfs_remove_group(&client->dev.kobj, &isl1208_rtc_sysfs_files);
-
- return 0;
-}
-
static const struct i2c_device_id isl1208_id[] = {
{ "isl1208", TYPE_ISL1208 },
{ "isl1218", TYPE_ISL1218 },
@@ -851,7 +845,6 @@ static struct i2c_driver isl1208_driver = {
.of_match_table = of_match_ptr(isl1208_of_match),
},
.probe = isl1208_probe,
- .remove = isl1208_remove,
.id_table = isl1208_id,
};
--
2.20.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* [PATCH AUTOSEL 4.19 181/191] rtc: tx4939: fixup nvmem name and register size
[not found] <20191110024013.29782-1-sashal@kernel.org>
2019-11-10 2:40 ` [PATCH AUTOSEL 4.19 180/191] rtc: isl1208: avoid possible sysfs race Sasha Levin
@ 2019-11-10 2:40 ` Sasha Levin
2019-11-10 2:40 ` [PATCH AUTOSEL 4.19 182/191] rtc: armada38x: fix possible race condition Sasha Levin
2 siblings, 0 replies; 3+ messages in thread
From: Sasha Levin @ 2019-11-10 2:40 UTC (permalink / raw)
To: linux-kernel, stable; +Cc: Alexandre Belloni, Sasha Levin, linux-rtc
From: Alexandre Belloni <alexandre.belloni@bootlin.com>
[ Upstream commit 2ab78755e93a10f6216c860a2012f3592f395603 ]
The default word_size and stride of 1 are correct for the tx4939. Also fix
the nvmem folder name.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/rtc/rtc-tx4939.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/drivers/rtc/rtc-tx4939.c b/drivers/rtc/rtc-tx4939.c
index 08dbefc79520e..61c110b2045f8 100644
--- a/drivers/rtc/rtc-tx4939.c
+++ b/drivers/rtc/rtc-tx4939.c
@@ -253,9 +253,7 @@ static int __init tx4939_rtc_probe(struct platform_device *pdev)
struct resource *res;
int irq, ret;
struct nvmem_config nvmem_cfg = {
- .name = "rv8803_nvram",
- .word_size = 4,
- .stride = 4,
+ .name = "tx4939_nvram",
.size = TX4939_RTC_REG_RAMSIZE,
.reg_read = tx4939_nvram_read,
.reg_write = tx4939_nvram_write,
--
2.20.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* [PATCH AUTOSEL 4.19 182/191] rtc: armada38x: fix possible race condition
[not found] <20191110024013.29782-1-sashal@kernel.org>
2019-11-10 2:40 ` [PATCH AUTOSEL 4.19 180/191] rtc: isl1208: avoid possible sysfs race Sasha Levin
2019-11-10 2:40 ` [PATCH AUTOSEL 4.19 181/191] rtc: tx4939: fixup nvmem name and register size Sasha Levin
@ 2019-11-10 2:40 ` Sasha Levin
2 siblings, 0 replies; 3+ messages in thread
From: Sasha Levin @ 2019-11-10 2:40 UTC (permalink / raw)
To: linux-kernel, stable; +Cc: Alexandre Belloni, Sasha Levin, linux-rtc
From: Alexandre Belloni <alexandre.belloni@bootlin.com>
[ Upstream commit 7d61cbb945a753af08e247b5f10bdd5dbb8d6c80 ]
The IRQ is requested before the struct rtc is allocated and registered, but
this struct is used in the IRQ handler. This may lead to a NULL pointer
dereference.
Switch to devm_rtc_allocate_device/rtc_register_device to allocate the rtc
before requesting the IRQ.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/rtc/rtc-armada38x.c | 22 +++++++++++-----------
1 file changed, 11 insertions(+), 11 deletions(-)
diff --git a/drivers/rtc/rtc-armada38x.c b/drivers/rtc/rtc-armada38x.c
index bde53c8ccee2c..b74338d6dde60 100644
--- a/drivers/rtc/rtc-armada38x.c
+++ b/drivers/rtc/rtc-armada38x.c
@@ -514,7 +514,6 @@ MODULE_DEVICE_TABLE(of, armada38x_rtc_of_match_table);
static __init int armada38x_rtc_probe(struct platform_device *pdev)
{
- const struct rtc_class_ops *ops;
struct resource *res;
struct armada38x_rtc *rtc;
const struct of_device_id *match;
@@ -551,6 +550,11 @@ static __init int armada38x_rtc_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "no irq\n");
return rtc->irq;
}
+
+ rtc->rtc_dev = devm_rtc_allocate_device(&pdev->dev);
+ if (IS_ERR(rtc->rtc_dev))
+ return PTR_ERR(rtc->rtc_dev);
+
if (devm_request_irq(&pdev->dev, rtc->irq, armada38x_rtc_alarm_irq,
0, pdev->name, rtc) < 0) {
dev_warn(&pdev->dev, "Interrupt not available.\n");
@@ -560,28 +564,24 @@ static __init int armada38x_rtc_probe(struct platform_device *pdev)
if (rtc->irq != -1) {
device_init_wakeup(&pdev->dev, 1);
- ops = &armada38x_rtc_ops;
+ rtc->rtc_dev->ops = &armada38x_rtc_ops;
} else {
/*
* If there is no interrupt available then we can't
* use the alarm
*/
- ops = &armada38x_rtc_ops_noirq;
+ rtc->rtc_dev->ops = &armada38x_rtc_ops_noirq;
}
rtc->data = (struct armada38x_rtc_data *)match->data;
-
/* Update RTC-MBUS bridge timing parameters */
rtc->data->update_mbus_timing(rtc);
- rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, pdev->name,
- ops, THIS_MODULE);
- if (IS_ERR(rtc->rtc_dev)) {
- ret = PTR_ERR(rtc->rtc_dev);
+ ret = rtc_register_device(rtc->rtc_dev);
+ if (ret)
dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
- return ret;
- }
- return 0;
+
+ return ret;
}
#ifdef CONFIG_PM_SLEEP
--
2.20.1
^ permalink raw reply related [flat|nested] 3+ messages in thread