linux-kernel - [PATCH v2] spi: stm32: fix sram pool free in probe error path

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Message-ID: <20250630-spi-fix-v2-1-4680939e2a3e@foss.st.com>
Date: Mon, 30 Jun 2025 14:59:23 +0200
From: Clément Le Goffic <clement.legoffic@...s.st.com>
To: Alain Volmat <alain.volmat@...s.st.com>, Mark Brown <broonie@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue
	<alexandre.torgue@...s.st.com>
CC: <linux-spi@...r.kernel.org>, <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        Dan
 Carpenter <dan.carpenter@...aro.org>,
        Clément Le Goffic
	<clement.legoffic@...s.st.com>
Subject: [PATCH v2] spi: stm32: fix sram pool free in probe error path

Add a test to check whether the sram_pool is NULL before freeing it.

Fixes: d17dd2f1d8a1 ("spi: stm32: use STM32 DMA with STM32 MDMA to enhance DDR use")
Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
Acked-by: Alain Volmat <alain.volmat@...s.st.com>
Signed-off-by: Clément Le Goffic <clement.legoffic@...s.st.com>
---
Changes in v2:
- Add Alain Volmat's Acked-by.
- Link to v1: https://lore.kernel.org/r/20250630-spi-fix-v1-1-2e671c006e15@foss.st.com
---
 drivers/spi/spi-stm32.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c
index 3d20f09f1ae7..858470a2cab5 100644
--- a/drivers/spi/spi-stm32.c
+++ b/drivers/spi/spi-stm32.c
@@ -2486,7 +2486,9 @@ static int stm32_spi_probe(struct platform_device *pdev)
 	if (spi->mdma_rx)
 		dma_release_channel(spi->mdma_rx);
 err_pool_free:
-	gen_pool_free(spi->sram_pool, (unsigned long)spi->sram_rx_buf, spi->sram_rx_buf_size);
+	if (spi->sram_pool)
+		gen_pool_free(spi->sram_pool, (unsigned long)spi->sram_rx_buf,
+			      spi->sram_rx_buf_size);
 err_dma_release:
 	if (spi->dma_tx)
 		dma_release_channel(spi->dma_tx);

---
base-commit: 045719b1d0aab98e6abdd7715e8587b997d1cefa
change-id: 20250630-spi-fix-860416bfb96d

Best regards,
-- 
Clément Le Goffic <clement.legoffic@...s.st.com>