firmware: dmi_scan: Make dmi_walk and dmi_walk_early return real error codes

[karo-tx-linux.git] / drivers / firmware / dmi_scan.c

diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index 82ee042f075cf90e5be7be6af1c1adf890e62078..fc30249132f51535e4212ec4e409b8d4ddb69c1b 100644 (file)
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -144,7 +144,7 @@ static int __init dmi_walk_early(void (*decode)(const struct dmi_header *,
 
        buf = dmi_early_remap(dmi_base, orig_dmi_len);
        if (buf == NULL)
-               return -1;
+               return -ENOMEM;
 
        dmi_decode_table(buf, decode, NULL);
 
@@ -1008,7 +1008,8 @@ EXPORT_SYMBOL(dmi_get_date);
  *     @decode: Callback function
  *     @private_data: Private data to be passed to the callback function
  *
- *     Returns -1 when the DMI table can't be reached, 0 on success.
+ *     Returns 0 on success, -ENXIO if DMI is not selected or not present,
+ *     or a different negative error code if DMI walking fails.
  */
 int dmi_walk(void (*decode)(const struct dmi_header *, void *),
             void *private_data)
@@ -1016,11 +1017,11 @@ int dmi_walk(void (*decode)(const struct dmi_header *, void *),
        u8 *buf;
 
        if (!dmi_available)
-               return -1;
+               return -ENXIO;
 
        buf = dmi_remap(dmi_base, dmi_len);
        if (buf == NULL)
-               return -1;
+               return -ENOMEM;
 
        dmi_decode_table(buf, decode, private_data);