linux-kernel - [PATCH v2 03/26] media: uvcvideo: Refactor iterators

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Date: Fri, 19 Apr 2024 09:47:49 +0000
From: Ricardo Ribalda <ribalda@...omium.org>
To: Martin Tuma <martin.tuma@...iteqautomotive.com>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>, 
 Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
 Hugues Fruchet <hugues.fruchet@...s.st.com>, 
 Alain Volmat <alain.volmat@...s.st.com>, 
 Maxime Coquelin <mcoquelin.stm32@...il.com>, 
 Alexandre Torgue <alexandre.torgue@...s.st.com>, 
 Paul Kocialkowski <paul.kocialkowski@...tlin.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Chen-Yu Tsai <wens@...e.org>, Jernej Skrabec <jernej.skrabec@...il.com>, 
 Samuel Holland <samuel@...lland.org>, 
 Sakari Ailus <sakari.ailus@...ux.intel.com>, 
 Thierry Reding <thierry.reding@...il.com>, 
 Jonathan Hunter <jonathanh@...dia.com>, 
 Sowjanya Komatineni <skomatineni@...dia.com>, 
 Luca Ceresoli <luca.ceresoli@...tlin.com>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
 Hans Verkuil <hverkuil@...all.nl>, Sergey Kozlov <serjk@...up.ru>, 
 Abylay Ospan <aospan@...up.ru>, 
 Ezequiel Garcia <ezequiel@...guardiasur.com.ar>, 
 Dmitry Osipenko <digetx@...il.com>, 
 Benjamin Mugnier <benjamin.mugnier@...s.st.com>, 
 Sylvain Petinot <sylvain.petinot@...s.st.com>, 
 Stanimir Varbanov <stanimir.k.varbanov@...il.com>, 
 Vikash Garodia <quic_vgarodia@...cinc.com>, 
 Bryan O'Donoghue <bryan.odonoghue@...aro.org>, 
 Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konrad.dybcio@...aro.org>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-stm32@...md-mailman.stormreply.com, 
 linux-arm-kernel@...ts.infradead.org, linux-staging@...ts.linux.dev, 
 linux-sunxi@...ts.linux.dev, linux-tegra@...r.kernel.org, 
 linux-mediatek@...ts.infradead.org, linux-arm-msm@...r.kernel.org, 
 Ricardo Ribalda <ribalda@...omium.org>, 
 Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: [PATCH v2 03/26] media: uvcvideo: Refactor iterators

Avoid using the iterators after the list_for_each() constructs.
This patch should be a NOP, but makes cocci, happier:

drivers/media/usb/uvc/uvc_ctrl.c:1861:44-50: ERROR: invalid reference to the index variable of the iterator on line 1850
drivers/media/usb/uvc/uvc_ctrl.c:2195:17-23: ERROR: invalid reference to the index variable of the iterator on line 2179

Reviewed-by: Sergey Senozhatsky <senozhatsky@...omium.org>
Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
 drivers/media/usb/uvc/uvc_ctrl.c | 24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index e59a463c2761..a4a987913430 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -1850,16 +1850,18 @@ int __uvc_ctrl_commit(struct uvc_fh *handle, int rollback,
 	list_for_each_entry(entity, &chain->entities, chain) {
 		ret = uvc_ctrl_commit_entity(chain->dev, entity, rollback,
 					     &err_ctrl);
-		if (ret < 0)
+		if (ret < 0) {
+			if (ctrls)
+				ctrls->error_idx =
+					uvc_ctrl_find_ctrl_idx(entity, ctrls,
+							       err_ctrl);
 			goto done;
+		}
 	}
 
 	if (!rollback)
 		uvc_ctrl_send_events(handle, ctrls->controls, ctrls->count);
 done:
-	if (ret < 0 && ctrls)
-		ctrls->error_idx = uvc_ctrl_find_ctrl_idx(entity, ctrls,
-							  err_ctrl);
 	mutex_unlock(&chain->ctrl_mutex);
 	return ret;
 }
@@ -2165,7 +2167,7 @@ static int uvc_ctrl_init_xu_ctrl(struct uvc_device *dev,
 int uvc_xu_ctrl_query(struct uvc_video_chain *chain,
 	struct uvc_xu_control_query *xqry)
 {
-	struct uvc_entity *entity;
+	struct uvc_entity *entity, *iter;
 	struct uvc_control *ctrl;
 	unsigned int i;
 	bool found;
@@ -2175,16 +2177,16 @@ int uvc_xu_ctrl_query(struct uvc_video_chain *chain,
 	int ret;
 
 	/* Find the extension unit. */
-	found = false;
-	list_for_each_entry(entity, &chain->entities, chain) {
-		if (UVC_ENTITY_TYPE(entity) == UVC_VC_EXTENSION_UNIT &&
-		    entity->id == xqry->unit) {
-			found = true;
+	entity = NULL;
+	list_for_each_entry(iter, &chain->entities, chain) {
+		if (UVC_ENTITY_TYPE(iter) == UVC_VC_EXTENSION_UNIT &&
+		    iter->id == xqry->unit) {
+			entity = iter;
 			break;
 		}
 	}
 
-	if (!found) {
+	if (!entity) {
 		uvc_dbg(chain->dev, CONTROL, "Extension unit %u not found\n",
 			xqry->unit);
 		return -ENOENT;

-- 
2.44.0.769.g3c40516874-goog