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

Currently they return -1 on error, which will confuse callers if
they try to interpret it as a normal negative error code.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>
Signed-off-by: Jean Delvare <jdelvare@suse.de>

diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index 82ee042..fc30249 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);
 

diff --git a/include/linux/dmi.h b/include/linux/dmi.h
index 5e9c74c..9bbf21a 100644 (file)
--- a/include/linux/dmi.h
+++ b/include/linux/dmi.h
@@ -136,7 +136,7 @@ static inline int dmi_name_in_vendors(const char *s) { return 0; }
 static inline int dmi_name_in_serial(const char *s) { return 0; }
 #define dmi_available 0
 static inline int dmi_walk(void (*decode)(const struct dmi_header *, void *),
-       void *private_data) { return -1; }
+       void *private_data) { return -ENXIO; }
 static inline bool dmi_match(enum dmi_field f, const char *str)
        { return false; }
 static inline void dmi_memdev_name(u16 handle, const char **bank,