linux-kernel - [PATCH AUTOSEL 6.6 08/15] spi: tegra210-quad: use WARN_ON_ONCE instead of WARN

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Message-Id: <20250422021759.1941570-8-sashal@kernel.org>
Date: Mon, 21 Apr 2025 22:17:52 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Breno Leitao <leitao@...ian.org>,
	Mark Brown <broonie@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	ldewangan@...dia.com,
	thierry.reding@...il.com,
	jonathanh@...dia.com,
	skomatineni@...dia.com,
	linux-tegra@...r.kernel.org,
	linux-spi@...r.kernel.org
Subject: [PATCH AUTOSEL 6.6 08/15] spi: tegra210-quad: use WARN_ON_ONCE instead of WARN_ON for timeouts

From: Breno Leitao <leitao@...ian.org>

[ Upstream commit 41c721fc093938745d116c3a21326a0ee03bb491 ]

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>
Link: https://patch.msgid.link/20250401-tegra-v2-1-126c293ec047@debian.org
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.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 d1afa4140e8a2..2abb54f9a9ba4 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 &&
-- 
2.39.5