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authorJean Delvare <khali@linux-fr.org>2007-06-12 13:57:19 +0200
committerMark M. Hoffman <mhoffman@lightlink.com>2007-07-19 14:22:14 -0400
commit04a6217df28e3004ba4e76eb0a356a30f72c564f (patch)
treec2361be6f6a778dc769d77aa3e9ebfe0ebea366d /drivers/hwmon
parentec5e1a4b8faa6a3522171a185a5c6ac9609e14b4 (diff)
hwmon: Fix a potential race condition on unload
Fix a potential race condition when some hardware monitoring platform drivers are being unloaded. I believe that the driver data pointer shouldn't be cleared before all the sysfs files are removed, otherwise a sysfs callback might attempt to dereference a NULL pointer. I'm not sure exactly what the driver core protects drivers against, so let's play it safe. While we're here, clear the driver data pointer when probe fails, so as to not leave an invalid pointer behind us. Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>
Diffstat (limited to 'drivers/hwmon')
-rw-r--r--drivers/hwmon/abituguru.c3
-rw-r--r--drivers/hwmon/f71805f.c2
-rw-r--r--drivers/hwmon/pc87427.c2
-rw-r--r--drivers/hwmon/smsc47m1.c3
-rw-r--r--drivers/hwmon/vt8231.c1
-rw-r--r--drivers/hwmon/w83627hf.c3
6 files changed, 9 insertions, 5 deletions
diff --git a/drivers/hwmon/abituguru.c b/drivers/hwmon/abituguru.c
index bede4d990ea..11a40da1353 100644
--- a/drivers/hwmon/abituguru.c
+++ b/drivers/hwmon/abituguru.c
@@ -1287,6 +1287,7 @@ abituguru_probe_error:
for (i = 0; i < ARRAY_SIZE(abituguru_sysfs_attr); i++)
device_remove_file(&pdev->dev,
&abituguru_sysfs_attr[i].dev_attr);
+ platform_set_drvdata(pdev, NULL);
kfree(data);
return res;
}
@@ -1296,13 +1297,13 @@ static int __devexit abituguru_remove(struct platform_device *pdev)
int i;
struct abituguru_data *data = platform_get_drvdata(pdev);
- platform_set_drvdata(pdev, NULL);
hwmon_device_unregister(data->class_dev);
for (i = 0; data->sysfs_attr[i].dev_attr.attr.name; i++)
device_remove_file(&pdev->dev, &data->sysfs_attr[i].dev_attr);
for (i = 0; i < ARRAY_SIZE(abituguru_sysfs_attr); i++)
device_remove_file(&pdev->dev,
&abituguru_sysfs_attr[i].dev_attr);
+ platform_set_drvdata(pdev, NULL);
kfree(data);
return 0;
diff --git a/drivers/hwmon/f71805f.c b/drivers/hwmon/f71805f.c
index e8b15047a6d..8fe4d70d8f5 100644
--- a/drivers/hwmon/f71805f.c
+++ b/drivers/hwmon/f71805f.c
@@ -1242,12 +1242,12 @@ static int __devexit f71805f_remove(struct platform_device *pdev)
struct resource *res;
int i;
- platform_set_drvdata(pdev, NULL);
hwmon_device_unregister(data->class_dev);
sysfs_remove_group(&pdev->dev.kobj, &f71805f_group);
for (i = 0; i < 4; i++)
sysfs_remove_group(&pdev->dev.kobj, &f71805f_group_optin[i]);
sysfs_remove_group(&pdev->dev.kobj, &f71805f_group_pwm_freq);
+ platform_set_drvdata(pdev, NULL);
kfree(data);
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
diff --git a/drivers/hwmon/pc87427.c b/drivers/hwmon/pc87427.c
index 29354fa26f8..2915bc4ad0d 100644
--- a/drivers/hwmon/pc87427.c
+++ b/drivers/hwmon/pc87427.c
@@ -484,7 +484,6 @@ static int __devexit pc87427_remove(struct platform_device *pdev)
struct resource *res;
int i;
- platform_set_drvdata(pdev, NULL);
hwmon_device_unregister(data->class_dev);
device_remove_file(&pdev->dev, &dev_attr_name);
for (i = 0; i < 8; i++) {
@@ -492,6 +491,7 @@ static int __devexit pc87427_remove(struct platform_device *pdev)
continue;
sysfs_remove_group(&pdev->dev.kobj, &pc87427_group_fan[i]);
}
+ platform_set_drvdata(pdev, NULL);
kfree(data);
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
diff --git a/drivers/hwmon/smsc47m1.c b/drivers/hwmon/smsc47m1.c
index 9bac3c2d84f..1de2f2be870 100644
--- a/drivers/hwmon/smsc47m1.c
+++ b/drivers/hwmon/smsc47m1.c
@@ -597,6 +597,7 @@ static int __devinit smsc47m1_probe(struct platform_device *pdev)
error_remove_files:
sysfs_remove_group(&dev->kobj, &smsc47m1_group);
error_free:
+ platform_set_drvdata(pdev, NULL);
kfree(data);
error_release:
release_region(res->start, SMSC_EXTENT);
@@ -608,12 +609,12 @@ static int __devexit smsc47m1_remove(struct platform_device *pdev)
struct smsc47m1_data *data = platform_get_drvdata(pdev);
struct resource *res;
- platform_set_drvdata(pdev, NULL);
hwmon_device_unregister(data->class_dev);
sysfs_remove_group(&pdev->dev.kobj, &smsc47m1_group);
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
release_region(res->start, SMSC_EXTENT);
+ platform_set_drvdata(pdev, NULL);
kfree(data);
return 0;
diff --git a/drivers/hwmon/vt8231.c b/drivers/hwmon/vt8231.c
index 320d8141be7..c604972f018 100644
--- a/drivers/hwmon/vt8231.c
+++ b/drivers/hwmon/vt8231.c
@@ -743,6 +743,7 @@ exit_remove_files:
sysfs_remove_group(&pdev->dev.kobj, &vt8231_group);
exit_free:
+ platform_set_drvdata(pdev, NULL);
kfree(data);
exit_release:
diff --git a/drivers/hwmon/w83627hf.c b/drivers/hwmon/w83627hf.c
index cd953604c38..1ce78179b00 100644
--- a/drivers/hwmon/w83627hf.c
+++ b/drivers/hwmon/w83627hf.c
@@ -1306,6 +1306,7 @@ static int __devinit w83627hf_probe(struct platform_device *pdev)
sysfs_remove_group(&dev->kobj, &w83627hf_group);
sysfs_remove_group(&dev->kobj, &w83627hf_group_opt);
ERROR3:
+ platform_set_drvdata(pdev, NULL);
kfree(data);
ERROR1:
release_region(res->start, WINB_REGION_SIZE);
@@ -1318,11 +1319,11 @@ static int __devexit w83627hf_remove(struct platform_device *pdev)
struct w83627hf_data *data = platform_get_drvdata(pdev);
struct resource *res;
- platform_set_drvdata(pdev, NULL);
hwmon_device_unregister(data->class_dev);
sysfs_remove_group(&pdev->dev.kobj, &w83627hf_group);
sysfs_remove_group(&pdev->dev.kobj, &w83627hf_group_opt);
+ platform_set_drvdata(pdev, NULL);
kfree(data);
res = platform_get_resource(pdev, IORESOURCE_IO, 0);