diff options
| author | Arend van Spriel <aspriel@gmail.com> | 2018-01-11 09:36:38 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-01-23 09:47:05 +0100 |
| commit | 3c47d19ff4dccf1500c33bcbe3b5bc804907a0da (patch) | |
| tree | 4bb4a54a7099b3048d32698728e0dbe5e5bf3adb /drivers | |
| parent | 36d1d09af1b97113cd014fd50694000ac3ca2824 (diff) | |
| download | linux-3c47d19ff4dccf1500c33bcbe3b5bc804907a0da.tar.bz2 | |
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')
| -rw-r--r-- | drivers/base/dd.c | 40 |
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"); } |