linux-kernel - [PATCH V3] media: stk1160: Fixed high volume of stk1160

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Date:   Sat, 25 Nov 2023 13:07:38 +0530
From:   Ghanshyam Agrawal <ghanshyam1898@...il.com>
To:     ezequiel@...guardiasur.com.ar, mchehab@...nel.org
Cc:     Ghanshyam Agrawal <ghanshyam1898@...il.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        Phillip Potter <phil@...lpotter.co.uk>
Subject: [PATCH V3] media: stk1160: Fixed high volume of stk1160_dbg messages

The function stk1160_dbg gets called too many times, which causes
the output to get flooded with messages. Since stk1160_dbg uses
printk, it is now replaced with printk_ratelimited directly.

Suggested-by: Phillip Potter <phil@...lpotter.co.uk>
Signed-off-by: Ghanshyam Agrawal <ghanshyam1898@...il.com>
---
V3:
Fixed the issue with my patch needing previous versions being applied
first.

Used printk_ratelimited instead of dev_warn_ratelimited because
of compiler error "incompatible pointer type".

V2:
To add KERN_WARNING in printk_ratelimited, and later as per warning by
the checkpatch script, replaced  printk_ratelimited with 
dev_warn_ratelimited.

V1:
The function stk1160_dbg gets called too many times, which causes
the output to get flooded with messages. Since stk1160_dbg uses
printk, it is now replaced with dev_warn_ratelimited.

 drivers/media/usb/stk1160/stk1160-video.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/media/usb/stk1160/stk1160-video.c b/drivers/media/usb/stk1160/stk1160-video.c
index 4e966f6bf608..98417fa31d70 100644
--- a/drivers/media/usb/stk1160/stk1160-video.c
+++ b/drivers/media/usb/stk1160/stk1160-video.c
@@ -107,8 +107,7 @@ void stk1160_copy_video(struct stk1160 *dev, u8 *src, int len)
 
 	/*
 	 * TODO: These stk1160_dbg are very spammy!
-	 * We should 1) check why we are getting them
-	 * and 2) add ratelimit.
+	 * We should check why we are getting them.
 	 *
 	 * UPDATE: One of the reasons (the only one?) for getting these
 	 * is incorrect standard (mismatch between expected and configured).
@@ -151,7 +150,7 @@ void stk1160_copy_video(struct stk1160 *dev, u8 *src, int len)
 
 	/* Let the bug hunt begin! sanity checks! */
 	if (lencopy < 0) {
-		stk1160_dbg("copy skipped: negative lencopy\n");
+		printk_ratelimited(KERN_WARNING "copy skipped: negative lencopy\n");
 		return;
 	}
 
-- 
2.25.1