[PATCH 1/2] DMI: add dmi_match

[Jiri Slaby <jirislaby@gmail.com>]

Add a wrapper for testing system_info which will handle also NULL
system infos.

This will be used by the ata PIIX driver.

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Cc: Jeff Garzik <jgarzik@redhat.com>
Cc: Alexandru Romanescu <a_romanescu@yahoo.co.uk>
Cc: Tejun Heo <tj@kernel.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
---
 include/linux/dmi.h |   17 +++++++++++++++++
 1 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/include/linux/dmi.h b/include/linux/dmi.h
index 2bfda17..9bdb4b9 100644
--- a/include/linux/dmi.h
+++ b/include/linux/dmi.h
@@ -48,6 +48,21 @@ extern int dmi_name_in_serial(const char *str);
 extern int dmi_available;
 extern int dmi_walk(void (*decode)(const struct dmi_header *));
 
+/**
+ * dmi_match - compare string to the dmi field (if exists)
+ *
+ * Returns true if requested field equals to str (including NULL).
+ */
+static inline bool dmi_match(enum dmi_field f, const char *str)
+{
+	const char *info = dmi_get_system_info(f);
+
+	if (info == NULL || str == NULL)
+		return info == str;
+
+	return !strcmp(info, str);
+}
+
 #else
 
 static inline int dmi_check_system(const struct dmi_system_id *list) { return 0; }
@@ -61,6 +76,8 @@ 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 *))
 	{ return -1; }
+static inline bool dmi_match(enum dmi_field f, const char *str)
+	{ return false; }
 
 #endif
 
-- 
1.6.0.5