[PATCH 1/1] ARM: OMAP2+: hwmod: Print an error message if no match exists for a hwmod class

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If no match is found for a hwmod class, omap_hwmod_for_each_by_class()
currently does not spit out any error messages. To make debugging
issues related to non-existent hwmod classes simpler make this function
print an error message in case no match is found for the supplied hwmod

Signed-off-by: Vaibhav Bedia <vaibhav.bedia@xxxxxx>
 arch/arm/mach-omap2/omap_hwmod.c |   11 ++++++++++-
 1 files changed, 10 insertions(+), 1 deletions(-)

diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c
index 6ca8e51..90e2306 100644
--- a/arch/arm/mach-omap2/omap_hwmod.c
+++ b/arch/arm/mach-omap2/omap_hwmod.c
@@ -3480,7 +3480,8 @@ int omap_hwmod_read_hardreset(struct omap_hwmod *oh, const char *name)
  * If the callback function returns something other than
  * zero, the iterator is terminated, and the callback function's return
  * value is passed back to the caller.  Returns 0 upon success, -EINVAL
- * if @classname or @fn are NULL, or passes back the error code from @fn.
+ * if @classname or @fn are NULL or no match is found for @classname,
+ * or passes back the error code from @fn.
 int omap_hwmod_for_each_by_class(const char *classname,
 				 int (*fn)(struct omap_hwmod *oh,
@@ -3489,6 +3490,7 @@ int omap_hwmod_for_each_by_class(const char *classname,
 	struct omap_hwmod *temp_oh;
 	int ret = 0;
+	bool found = false;
 	if (!classname || !fn)
 		return -EINVAL;
@@ -3498,6 +3500,7 @@ int omap_hwmod_for_each_by_class(const char *classname,
 	list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
 		if (!strcmp(temp_oh->class->name, classname)) {
+			found = true;
 			pr_debug("omap_hwmod: %s: %s: calling callback fn\n",
 				 __func__, temp_oh->name);
 			ret = (*fn)(temp_oh, user);
@@ -3506,6 +3509,12 @@ int omap_hwmod_for_each_by_class(const char *classname,
+	if (!found) {
+		pr_err("omap_hwmod: %s: no match for class %s\n",
+			__func__, classname);
+		return -EINVAL;
+	}
 	if (ret)
 		pr_debug("omap_hwmod: %s: iterator terminated early: %d\n",
 			 __func__, ret);

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