dmi: add support for exact DMI matches in addition to substring matching

dmi_match() considers a substring match to be a successful match.  This is
not always sufficient to distinguish between DMI data for different
systems.  Add support for exact string matching using strcmp() in addition
to the substring matching using strstr().

The specific use case in the i915 driver is to allow us to use an exact
match for D510MO, without also incorrectly matching D510MOV:

  {
	.ident = "Intel D510MO",
	.matches = {
		DMI_MATCH(DMI_BOARD_VENDOR, "Intel"),
		DMI_EXACT_MATCH(DMI_BOARD_NAME, "D510MO"),
	},
  }

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Cc: <annndddrr@gmail.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Cornel Panceac <cpanceac@gmail.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index b95159b..eb760a2 100644 (file)
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -551,9 +551,15 @@ static bool dmi_matches(const struct dmi_system_id *dmi)
                int s = dmi->matches[i].slot;
                if (s == DMI_NONE)
                        break;
-               if (dmi_ident[s]
-                   && strstr(dmi_ident[s], dmi->matches[i].substr))
-                       continue;
+               if (dmi_ident[s]) {
+                       if (!dmi->matches[i].exact_match &&
+                           strstr(dmi_ident[s], dmi->matches[i].substr))
+                               continue;
+                       else if (dmi->matches[i].exact_match &&
+                                !strcmp(dmi_ident[s], dmi->matches[i].substr))
+                               continue;
+               }
+
                /* No match */
                return false;
        }

diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
index b508016..b3bd7e7 100644 (file)
--- a/include/linux/mod_devicetable.h
+++ b/include/linux/mod_devicetable.h
@@ -456,7 +456,8 @@ enum dmi_field {
 };
 
 struct dmi_strmatch {
-       unsigned char slot;
+       unsigned char slot:7;
+       unsigned char exact_match:1;
        char substr[79];
 };
 
@@ -474,7 +475,8 @@ struct dmi_system_id {
  */
 #define dmi_device_id dmi_system_id
 
-#define DMI_MATCH(a, b)        { a, b }
+#define DMI_MATCH(a, b)        { .slot = a, .substr = b }
+#define DMI_EXACT_MATCH(a, b)  { .slot = a, .substr = b, .exact_match = 1 }
 
 #define PLATFORM_NAME_SIZE     20
 #define PLATFORM_MODULE_PREFIX "platform:"