From: Viresh Kumar <viresh.kumar@linaro.org>
Date: Mon, 7 Sep 2015 10:31:19 +0000 (+0530)
Subject: greybus: manifest: don't reject the interface on failing to initialize a cport
X-Git-Tag: v4.9-rc1~119^2~378^2~21^2~1216
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=98d7fbcad90b43f4e4fe03ef3261dbdcb6fe220f;p=karo-tx-linux.git

greybus: manifest: don't reject the interface on failing to initialize a cport

A 'bundle' represents a device in greybus. It may require multiple
cports for its functioning. If we fail to setup any cport of a bundle,
we better reject the complete bundle as the device may not be able to
function properly then.

But, failing to setup a cport of bundle X doesn't mean that the device
corresponding to bundle Y will not work properly. Bundles should be
treated as separate independent devices.

While parsing manifest for an interface, treat bundles as separate
entities and don't reject entire interface and its bundles on failing to
initialize a cport. But make sure the bundle which needs the cport, gets
destroyed properly.

We now release the bundle descriptor before parsing the cports, but that
shouldn't make any difference.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
---

diff --git a/drivers/staging/greybus/manifest.c b/drivers/staging/greybus/manifest.c
index 559b2ee6e434..eda0f55580e3 100644
--- a/drivers/staging/greybus/manifest.c
+++ b/drivers/staging/greybus/manifest.c
@@ -273,6 +273,7 @@ static u32 gb_manifest_parse_bundles(struct gb_interface *intf)
 	struct gb_bundle *bundle;
 	struct gb_bundle *bundle_next;
 	u32 count = 0;
+	u8 bundle_id;
 
 	list_for_each_entry_safe(desc, next, &intf->manifest_descs, links) {
 		struct greybus_descriptor_bundle *desc_bundle;
@@ -282,9 +283,10 @@ static u32 gb_manifest_parse_bundles(struct gb_interface *intf)
 
 		/* Found one.  Set up its bundle structure*/
 		desc_bundle = desc->data;
+		bundle_id = desc_bundle->id;
 
 		/* Don't recreate bundle for control cport */
-		if (desc_bundle->id == GB_CONTROL_BUNDLE_ID) {
+		if (bundle_id == GB_CONTROL_BUNDLE_ID) {
 			/* This should have class set to control class */
 			if (desc_bundle->class != GREYBUS_CLASS_CONTROL) {
 				dev_err(&intf->dev,
@@ -301,22 +303,47 @@ static u32 gb_manifest_parse_bundles(struct gb_interface *intf)
 		if (desc_bundle->class == GREYBUS_CLASS_CONTROL) {
 			dev_err(&intf->dev,
 				"bundle 0x%02x cannot use control class\n",
-				desc_bundle->id);
+				bundle_id);
 			goto cleanup;
 		}
 
-		bundle = gb_bundle_create(intf, desc_bundle->id,
-					  desc_bundle->class);
+		bundle = gb_bundle_create(intf, bundle_id, desc_bundle->class);
 		if (!bundle)
 			goto cleanup;
 
 parse_cports:
-		/* Now go set up this bundle's functions and cports */
-		if (!gb_manifest_parse_cports(bundle))
-			goto cleanup;
-
 		/* Done with this bundle descriptor */
 		release_manifest_descriptor(desc);
+
+		/*
+		 * Now go set up this bundle's functions and cports.
+		 *
+		 * A 'bundle' represents a device in greybus. It may require
+		 * multiple cports for its functioning. If we fail to setup any
+		 * cport of a bundle, we better reject the complete bundle as
+		 * the device may not be able to function properly then.
+		 *
+		 * But, failing to setup a cport of bundle X doesn't mean that
+		 * the device corresponding to bundle Y will not work properly.
+		 * Bundles should be treated as separate independent devices.
+		 *
+		 * While parsing manifest for an interface, treat bundles as
+		 * separate entities and don't reject entire interface and its
+		 * bundles on failing to initialize a cport. But make sure the
+		 * bundle which needs the cport, gets destroyed properly.
+		 *
+		 * The control bundle and its connections are special. The
+		 * entire manifest should be rejected if we failed to initialize
+		 * the control bundle/connections.
+		 */
+		if (!gb_manifest_parse_cports(bundle)) {
+			if (bundle_id == GB_CONTROL_BUNDLE_ID)
+				goto cleanup;
+
+			gb_bundle_destroy(bundle);
+			continue;
+		}
+
 		count++;
 	}