linux-kernel - [PATCH v2] powerpc: floppy: Add missing checks after DMA map

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Message-ID: <20250620075602.12575-1-fourier.thomas@gmail.com>
Date: Fri, 20 Jun 2025 09:55:55 +0200
From: Thomas Fourier <fourier.thomas@...il.com>
To: 
Cc: Thomas Fourier <fourier.thomas@...il.com>,
	Madhavan Srinivasan <maddy@...ux.ibm.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Nicholas Piggin <npiggin@...il.com>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2] powerpc: floppy: Add missing checks after DMA map

The DMA map functions can fail and should be tested for errors.

Signed-off-by: Thomas Fourier <fourier.thomas@...il.com>
---
 arch/powerpc/include/asm/floppy.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/include/asm/floppy.h b/arch/powerpc/include/asm/floppy.h
index f8ce178b43b7..34abf8bea2cc 100644
--- a/arch/powerpc/include/asm/floppy.h
+++ b/arch/powerpc/include/asm/floppy.h
@@ -144,9 +144,12 @@ static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
 		bus_addr = 0;
 	}
 
-	if (!bus_addr)	/* need to map it */
+	if (!bus_addr) {	/* need to map it */
 		bus_addr = dma_map_single(&isa_bridge_pcidev->dev, addr, size,
 					  dir);
+		if (dma_mapping_error(&isa_bridge_pcidev->dev, bus_addr))
+			return -ENOMEM;
+	}
 
 	/* remember this one as prev */
 	prev_addr = addr;
-- 
2.43.0