linux-kernel - [PATCH v2] wlcore: sdio: Rate limit wl12xx_sdio_raw

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Date: Wed, 28 Feb 2024 11:10:32 +0100
From: Javier Martinez Canillas <javierm@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: Nishanth Menon <nm@...com>,
	Javier Martinez Canillas <javierm@...hat.com>,
	Breno Leitao <leitao@...ian.org>,
	Kalle Valo <kvalo@...nel.org>,
	Li Zetao <lizetao1@...wei.com>,
	linux-wireless@...r.kernel.org
Subject: [PATCH v2] wlcore: sdio: Rate limit wl12xx_sdio_raw_{read,write}() failures warns

When these failures happen, the warning and call trace is printed which is
excessive. Instead, just print the error but rate limited to prevent warns
to unnecessarily pollute the kernel log buffer and make the serial console
practically unusable.

For example, on an AM625 BeaglePlay board where accessing a SDIO WiFi chip
fails with an -110 (ETIMEDOUT) error:

  $ dmesg | grep "sdio write\|read failed (-110)" | wc -l
  39

Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>
Reviewed-by: Breno Leitao <leitao@...ian.org>
---

Changes in v2:
- Add Reviewed-by tag by Breno Leitao.
- Drop warns which seems excesive and rate limit the error (Kalle Vallo).

 drivers/net/wireless/ti/wlcore/sdio.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/ti/wlcore/sdio.c b/drivers/net/wireless/ti/wlcore/sdio.c
index eb5482ed76ae..70b9648acaaf 100644
--- a/drivers/net/wireless/ti/wlcore/sdio.c
+++ b/drivers/net/wireless/ti/wlcore/sdio.c
@@ -75,8 +75,8 @@ static int __must_check wl12xx_sdio_raw_read(struct device *child, int addr,
 
 	sdio_release_host(func);
 
-	if (WARN_ON(ret))
-		dev_err(child->parent, "sdio read failed (%d)\n", ret);
+	if (ret)
+		dev_err_ratelimited(child->parent, "sdio read failed (%d)\n", ret);
 
 	if (unlikely(dump)) {
 		printk(KERN_DEBUG "wlcore_sdio: READ from 0x%04x\n", addr);
@@ -120,8 +120,8 @@ static int __must_check wl12xx_sdio_raw_write(struct device *child, int addr,
 
 	sdio_release_host(func);
 
-	if (WARN_ON(ret))
-		dev_err(child->parent, "sdio write failed (%d)\n", ret);
+	if (ret)
+		dev_err_ratelimited(child->parent, "sdio write failed (%d)\n", ret);
 
 	return ret;
 }
-- 
2.43.2