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From: Philipp Zabel <p.zabel@pengutronix.de>
To: linux-kernel@vger.kernel.org
Cc: linux-media@vger.kernel.org, devel@driverdev.osuosl.org,
	Grant Likely <grant.likely@linaro.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Guennadi Liakhovetski <g.liakhovetski@gmx.de>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Mauro Carvalho Chehab <m.chehab@samsung.com>,
	Russell King <rmk+kernel@arm.linux.org.uk>,
	kernel@pengutronix.de, Philipp Zabel <p.zabel@pengutronix.de>
Subject: [PATCH v3 2/8] imx-drm: Do not decrement endpoint node refcount in the loop
Date: Thu, 11 Sep 2014 17:33:01 +0200	[thread overview]
Message-ID: <1410449587-1677-3-git-send-email-p.zabel@pengutronix.de> (raw)
In-Reply-To: <1410449587-1677-1-git-send-email-p.zabel@pengutronix.de>

In preparation for the following patch, stop decrementing the endpoint node
refcount in the loop. This temporarily leaks a reference to the endpoint node,
which will be fixed by having of_graph_get_next_endpoint decrement the refcount
of its prev argument instead.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
---
 drivers/staging/imx-drm/imx-drm-core.c | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/drivers/staging/imx-drm/imx-drm-core.c b/drivers/staging/imx-drm/imx-drm-core.c
index 6b22106..12303b3 100644
--- a/drivers/staging/imx-drm/imx-drm-core.c
+++ b/drivers/staging/imx-drm/imx-drm-core.c
@@ -434,14 +434,6 @@ static uint32_t imx_drm_find_crtc_mask(struct imx_drm_device *imxdrm,
 	return 0;
 }
 
-static struct device_node *imx_drm_of_get_next_endpoint(
-		const struct device_node *parent, struct device_node *prev)
-{
-	struct device_node *node = of_graph_get_next_endpoint(parent, prev);
-	of_node_put(prev);
-	return node;
-}
-
 int imx_drm_encoder_parse_of(struct drm_device *drm,
 	struct drm_encoder *encoder, struct device_node *np)
 {
@@ -453,7 +445,7 @@ int imx_drm_encoder_parse_of(struct drm_device *drm,
 	for (i = 0; ; i++) {
 		u32 mask;
 
-		ep = imx_drm_of_get_next_endpoint(np, ep);
+		ep = of_graph_get_next_endpoint(np, ep);
 		if (!ep)
 			break;
 
@@ -502,7 +494,7 @@ int imx_drm_encoder_get_mux_id(struct device_node *node,
 		return -EINVAL;
 
 	do {
-		ep = imx_drm_of_get_next_endpoint(node, ep);
+		ep = of_graph_get_next_endpoint(node, ep);
 		if (!ep)
 			break;
 
-- 
2.1.0


  parent reply	other threads:[~2014-09-11 15:34 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-09-11 15:32 [PATCH v3 0/8] Add of-graph helpers to loop over endpoints and find ports by id Philipp Zabel
2014-09-11 15:33 ` [PATCH v3 1/8] [media] soc_camera: Do not decrement endpoint node refcount in the loop Philipp Zabel
2014-09-20  7:24   ` Guennadi Liakhovetski
2014-09-25  7:40     ` Philipp Zabel
2014-09-11 15:33 ` Philipp Zabel [this message]
2014-09-11 15:33 ` [PATCH v3 3/8] of: Decrement refcount of previous endpoint in of_graph_get_next_endpoint Philipp Zabel
2014-09-11 15:33 ` [PATCH v3 4/8] of: Add for_each_endpoint_of_node helper macro Philipp Zabel
2014-09-11 15:33 ` [PATCH v3 5/8] of: Add of_graph_get_port_by_id function Philipp Zabel
2014-09-11 18:18   ` Laurent Pinchart
2014-09-11 15:33 ` [PATCH v3 6/8] drm: use for_each_endpoint_of_node macro in drm_of_find_possible_crtcs Philipp Zabel
2014-09-11 15:33 ` [PATCH v3 7/8] imx-drm: use for_each_endpoint_of_node macro in imx_drm_encoder_get_mux_id Philipp Zabel
2014-09-11 15:33 ` [PATCH v3 8/8] imx-drm: use for_each_endpoint_of_node macro in imx_drm_encoder_parse_of Philipp Zabel

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