linux-kernel - [PATCH v3 11/12] drm/udl: Don't re-initialize stuff at retrying the URB list allocation

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Date:   Thu,  8 Sep 2022 11:51:14 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Thomas Zimmermann <tzimmermann@...e.de>
Cc:     Daniel Vetter <daniel.vetter@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 11/12] drm/udl: Don't re-initialize stuff at retrying the URB list allocation

udl_alloc_urb_list() retires the allocation if there is no enough room
left, and it reinitializes the stuff unnecessarily such as the linked
list head and the waitqueue, which could be harmful.  Those should be
outside the retry loop.

Acked-by: Thomas Zimmermann <tzimmermann@...e.de>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
---
 drivers/gpu/drm/udl/udl_main.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/udl/udl_main.c b/drivers/gpu/drm/udl/udl_main.c
index 16aa4a655e7f..829edb60a987 100644
--- a/drivers/gpu/drm/udl/udl_main.c
+++ b/drivers/gpu/drm/udl/udl_main.c
@@ -182,15 +182,14 @@ static int udl_alloc_urb_list(struct drm_device *dev, int count, size_t size)
 	struct usb_device *udev = udl_to_usb_device(udl);
 
 	spin_lock_init(&udl->urbs.lock);
-
-retry:
-	udl->urbs.size = size;
 	INIT_LIST_HEAD(&udl->urbs.list);
-
 	init_waitqueue_head(&udl->urbs.sleep);
 	udl->urbs.count = 0;
 	udl->urbs.available = 0;
 
+retry:
+	udl->urbs.size = size;
+
 	while (udl->urbs.count * size < wanted_size) {
 		unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL);
 		if (!unode)
-- 
2.35.3