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authorArend van Spriel <aspriel@gmail.com>2018-01-11 09:36:38 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-01-23 09:47:05 +0100
commit3c47d19ff4dccf1500c33bcbe3b5bc804907a0da (patch)
tree4bb4a54a7099b3048d32698728e0dbe5e5bf3adb /drivers/base
parent36d1d09af1b97113cd014fd50694000ac3ca2824 (diff)
drivers: base: add coredump driver ops
This adds the coredump driver operation. When the driver defines it a coredump file is added in the sysfs folder of the device upon driver binding. The file is removed when the driver is unbound. User-space can trigger a coredump for this device by echo'ing to the coredump file. Signed-off-by: Arend van Spriel <aspriel@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/dd.c40
1 files changed, 33 insertions, 7 deletions
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 533c82f55cea..de6fd092bf2f 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -288,6 +288,18 @@ static void driver_bound(struct device *dev)
kobject_uevent(&dev->kobj, KOBJ_BIND);
}
+static ssize_t coredump_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ device_lock(dev);
+ if (dev->driver->coredump)
+ dev->driver->coredump(dev);
+ device_unlock(dev);
+
+ return count;
+}
+static DEVICE_ATTR_WO(coredump);
+
static int driver_sysfs_add(struct device *dev)
{
int ret;
@@ -297,14 +309,26 @@ static int driver_sysfs_add(struct device *dev)
BUS_NOTIFY_BIND_DRIVER, dev);
ret = sysfs_create_link(&dev->driver->p->kobj, &dev->kobj,
+ kobject_name(&dev->kobj));
+ if (ret)
+ goto fail;
+
+ ret = sysfs_create_link(&dev->kobj, &dev->driver->p->kobj,
+ "driver");
+ if (ret)
+ goto rm_dev;
+
+ if (!IS_ENABLED(CONFIG_DEV_COREDUMP) || !dev->driver->coredump ||
+ !device_create_file(dev, &dev_attr_coredump))
+ return 0;
+
+ sysfs_remove_link(&dev->kobj, "driver");
+
+rm_dev:
+ sysfs_remove_link(&dev->driver->p->kobj,
kobject_name(&dev->kobj));
- if (ret == 0) {
- ret = sysfs_create_link(&dev->kobj, &dev->driver->p->kobj,
- "driver");
- if (ret)
- sysfs_remove_link(&dev->driver->p->kobj,
- kobject_name(&dev->kobj));
- }
+
+fail:
return ret;
}
@@ -313,6 +337,8 @@ static void driver_sysfs_remove(struct device *dev)
struct device_driver *drv = dev->driver;
if (drv) {
+ if (drv->coredump)
+ device_remove_file(dev, &dev_attr_coredump);
sysfs_remove_link(&drv->p->kobj, kobject_name(&dev->kobj));
sysfs_remove_link(&dev->kobj, "driver");
}

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