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-rw-r--r--libsysfs/sysfs_class.c3
-rw-r--r--libsysfs/sysfs_device.c32
2 files changed, 33 insertions, 2 deletions
diff --git a/libsysfs/sysfs_class.c b/libsysfs/sysfs_class.c
index db59aef90f..a132bb64cb 100644
--- a/libsysfs/sysfs_class.c
+++ b/libsysfs/sysfs_class.c
@@ -640,6 +640,9 @@ struct sysfs_attribute *sysfs_get_classdev_attr
return cur;
}
+ if (clsdev->directory == NULL)
+ return NULL;
+
if (clsdev->directory->subdirs == NULL)
if ((sysfs_read_dir_subdirs(clsdev->directory)) != 0 ||
clsdev->directory->subdirs == NULL)
diff --git a/libsysfs/sysfs_device.c b/libsysfs/sysfs_device.c
index f2f8d2d611..83c3adc080 100644
--- a/libsysfs/sysfs_device.c
+++ b/libsysfs/sysfs_device.c
@@ -24,7 +24,9 @@
#include "sysfs.h"
/**
- * get_dev_driver: fills in the dev->driver_name field
+ * get_dev_driver: fills in the dev->driver_name field, but searches by
+ * opening subsystem. Only to be used if no driver link exists in
+ * device directory.
*
* Returns 0 on SUCCESS and 1 on error
*/
@@ -73,6 +75,32 @@ static int get_dev_driver(struct sysfs_device *dev)
}
return 1;
}
+
+/*
+ * get_device_driver_name: gets device's driver name, searches for driver
+ * link first before going the brute force route.
+ * @dev: device to retrieve driver
+ * returns 0 with success and 1 with error
+ */
+static int get_device_driver_name(struct sysfs_device *dev)
+{
+ char devpath[SYSFS_PATH_MAX], drvpath[SYSFS_PATH_MAX];
+
+ if (dev == NULL) {
+ errno = EINVAL;
+ return 1;
+ }
+ memset(devpath, 0, SYSFS_PATH_MAX);
+ memset(drvpath, 0, SYSFS_PATH_MAX);
+ safestrcpy(devpath, dev->path);
+ safestrcat(devpath, "/driver");
+
+ if ((sysfs_get_link(devpath, drvpath, SYSFS_PATH_MAX)) != 0)
+ return(get_dev_driver(dev));
+
+ return (sysfs_get_name_from_path(drvpath, dev->driver_name,
+ SYSFS_NAME_LEN));
+}
/**
* sysfs_get_device_bus: retrieves the bus name the device is on, checks path
@@ -262,7 +290,7 @@ struct sysfs_device *sysfs_open_device_path(const char *path)
if (sysfs_get_device_bus(dev) != 0)
dprintf("Could not get device bus\n");
- if (get_dev_driver(dev) != 0) {
+ if (get_device_driver_name(dev) != 0) {
dprintf("Could not get device %s's driver\n", dev->bus_id);
safestrcpy(dev->driver_name, SYSFS_UNKNOWN);
}