ACPI: fix create_modalias() return value handling

Currently, create_modalias() handles the output truncated case in
an improper way (return -EINVAL).
Plus, acpi_device_uevent() and acpi_device_modalias_show() do
improper check for the create_modalias() return value as well.

This patch fixes create_modalias() to
return -EINVAL if there is an output error,
return -ENOMEM if the output is truncated,
and also fixes both acpi_device_uevent() and acpi_device_modalias_show()
to do proper return value check.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 10 insertions, 6 deletions

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index fd39459926b1..c92532158195 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -85,6 +85,9 @@ int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
  * Creates hid/cid(s) string needed for modalias and uevent
  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
  * char *modalias: "acpi:IBM0001:ACPI0001"
+ * Return: 0: no _HID and no _CID
+ *         -EINVAL: output error
+ *         -ENOMEM: output is truncated
 */
 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
                            int size)
@@ -101,8 +104,10 @@ static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
 
         list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
                 count = snprintf(&modalias[len], size, "%s:", id->id);
-                if (count < 0 || count >= size)
-                        return -EINVAL;
+                if (count < 0)
+                        return EINVAL;
+                if (count >= size)
+                        return -ENOMEM;
                 len += count;
                 size -= count;
         }
@@ -116,10 +121,9 @@ acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, cha
         struct acpi_device *acpi_dev = to_acpi_device(dev);
         int len;
 
-        /* Device has no HID and no CID or string is >1024 */
         len = create_modalias(acpi_dev, buf, 1024);
         if (len <= 0)
-                return 0;
+                return len;
         buf[len++] = '\n';
         return len;
 }
@@ -782,8 +786,8 @@ static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
                 return -ENOMEM;
         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
                               sizeof(env->buf) - env->buflen);
-        if (len >= (sizeof(env->buf) - env->buflen))
-                return -ENOMEM;
+        if (len <= 0)
+                return len;
         env->buflen += len;
         return 0;
 }