linux-kernel - [PATCH 2/3] spi: tegra210-quad: use WARN_ON_ONCE instead of WARN

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Message-Id: <20250317-tegra-v1-2-78474efc0386@debian.org>
Date: Mon, 17 Mar 2025 08:44:02 -0700
From: Breno Leitao <leitao@...ian.org>
To: Thierry Reding <thierry.reding@...il.com>, 
 Jonathan Hunter <jonathanh@...dia.com>, 
 Sowjanya Komatineni <skomatineni@...dia.com>, 
 Laxman Dewangan <ldewangan@...dia.com>, Mark Brown <broonie@...nel.org>
Cc: linux-tegra@...r.kernel.org, linux-spi@...r.kernel.org, 
 linux-kernel@...r.kernel.org, rmikey@...a.com, 
 Breno Leitao <leitao@...ian.org>, kernel-team@...a.com
Subject: [PATCH 2/3] spi: tegra210-quad: use WARN_ON_ONCE instead of
 WARN_ON for timeouts

Some machines with tegra_qspi_combined_seq_xfer hardware issues generate
excessive kernel warnings, severely polluting the logs:

    dmesg | grep -i "WARNING:.*tegra_qspi_transfer_one_message" | wc -l
    94451

This patch replaces WARN_ON with WARN_ON_ONCE for timeout conditions to
reduce log spam. The subsequent error message still prints on each
occurrence, providing sufficient information about the failure, while
the stack trace is only needed once for debugging purposes.

Signed-off-by: Breno Leitao <leitao@...ian.org>
---
 drivers/spi/spi-tegra210-quad.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/spi-tegra210-quad.c b/drivers/spi/spi-tegra210-quad.c
index 9027f995a6669..7c10b1272b0ad 100644
--- a/drivers/spi/spi-tegra210-quad.c
+++ b/drivers/spi/spi-tegra210-quad.c
@@ -1117,7 +1117,7 @@ static int tegra_qspi_combined_seq_xfer(struct tegra_qspi *tqspi,
 					(&tqspi->xfer_completion,
 					QSPI_DMA_TIMEOUT);
 
-			if (WARN_ON(ret == 0)) {
+			if (WARN_ON_ONCE(ret == 0)) {
 				dev_err(tqspi->dev, "QSPI Transfer failed with timeout: %d\n",
 					ret);
 				if (tqspi->is_curr_dma_xfer &&

-- 
2.47.1