linux-kernel - [PATCH v9 3/4] drm/atmel-hlcdc: always iterate over the first 4 output endpoints

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20180825085620.10566-4-peda@axentia.se>
Date:   Sat, 25 Aug 2018 10:56:19 +0200
From:   Peter Rosin <peda@...ntia.se>
To:     linux-kernel@...r.kernel.org
Cc:     Peter Rosin <peda@...ntia.se>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        David Airlie <airlied@...ux.ie>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, Jyri Sarha <jsarha@...com>,
        Daniel Vetter <daniel@...ll.ch>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Sakari Ailus <sakari.ailus@....fi>
Subject: [PATCH v9 3/4] drm/atmel-hlcdc: always iterate over the first 4 output endpoints

This enables more flexible devicetrees. You can e.g. have two output
nodes where one is not enabled, without the ordering affecting things.

Prior to this patch the active nodes had to have endpoint id zero and
upwards consecutively.

Signed-off-by: Peter Rosin <peda@...ntia.se>
---
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
index 8db51fb131db..c05c2b744981 100644
--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
@@ -78,12 +78,23 @@ static int atmel_hlcdc_attach_endpoint(struct drm_device *dev, int endpoint)
 int atmel_hlcdc_create_outputs(struct drm_device *dev)
 {
 	int endpoint, ret = 0;
+	int attached = 0;
 
-	for (endpoint = 0; !ret; endpoint++)
+	/*
+	 * Always scan the first few endpoints even if we get -ENODEV,
+	 * but keep going after that as long as we keep getting hits.
+	 */
+	for (endpoint = 0; !ret || endpoint < 4; endpoint++) {
 		ret = atmel_hlcdc_attach_endpoint(dev, endpoint);
+		if (ret == -ENODEV)
+			continue;
+		if (ret)
+			break;
+		attached++;
+	}
 
 	/* At least one device was successfully attached.*/
-	if (ret == -ENODEV && endpoint)
+	if (ret == -ENODEV && attached)
 		return 0;
 
 	return ret;
-- 
2.11.0