DMI: add dmi_match
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: Alexandru Romanescu <a_romanescu@yahoo.co.uk>
Cc: Tejun Heo <tj@kernel.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index 4a597d8..78b989d 100644
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -582,3 +582,19 @@
return 0;
}
EXPORT_SYMBOL_GPL(dmi_walk);
+
+/**
+ * dmi_match - compare a string to the dmi field (if exists)
+ *
+ * Returns true if the requested field equals to the str (including NULL).
+ */
+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);
+}
+EXPORT_SYMBOL_GPL(dmi_match);
diff --git a/include/linux/dmi.h b/include/linux/dmi.h
index 2bfda17..3416190 100644
--- a/include/linux/dmi.h
+++ b/include/linux/dmi.h
@@ -47,6 +47,7 @@
extern int dmi_name_in_serial(const char *str);
extern int dmi_available;
extern int dmi_walk(void (*decode)(const struct dmi_header *));
+extern bool dmi_match(enum dmi_field f, const char *str);
#else
@@ -61,6 +62,8 @@
#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