From 8539d5dcf2d04cfc1985e3272fb20b3109ebb492 Mon Sep 17 00:00:00 2001
From: Enrico Granata <egranata@chromium.org>
Date: Mon, 6 May 2019 11:05:23 -0700
Subject: [PATCH] CHROMIUM: HACK: ignore error in set up of cros_ec_sensor_ring
 iio_device

cros-ec-ring exposes attributes that are tricky for libiio to parse due to
its use of extended_name on a few of its channels. Since this driver is
slated for removal, and the correct fix for this general issue is tricky
and likely to require design work, the path of least friction is a
temporary hack in our internal repo to allow the iio_context to proceed
to being created even if cros-ec-ring causes a parse error

BUG=chromium:958236
TEST=run mems_setup with the sensor ring driver loaded,
     observe it ignore the device instead of failing

Conflicts: Use IIO_DEBUG instead of DEBUG.

Change-Id: I51f825c6797a23f469703aaba4a5551bf5a60b61
Signed-off-by: Enrico Granata <egranata@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1597153
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Reviewed-by: Gwendal Grignou <gwendal@chromium.org>
---
 local.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/local.c b/local.c
index d05afb6f..40b89957 100644
--- a/local.c
+++ b/local.c
@@ -1765,8 +1765,18 @@ static int create_device(void *d, const char *path)
 		set_channel_name(chn);
 		ret = handle_scan_elements(chn);
 		free_protected_attrs(chn);
-		if (ret < 0)
-			goto err_free_scan_elements;
+		if (ret < 0) {
+			if (dev->name &&
+			    !strcmp("cros-ec-ring", dev->name)) {
+				IIO_DEBUG("ignoring cros-ec-ring\n");
+
+				/* pretend the operation completed successfully
+				 * even though we can't process the attributes
+				 * of the sensor ring */
+				ret = 0;
+				goto err_free_scan_elements;
+			}
+		}
 	}
 
 	ret = detect_and_move_global_attrs(dev);