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 <[email protected]>
Reviewed-by: Christophe Leroy <[email protected]>
Signed-off-by: Madhavan Srinivasan <[email protected]>
Link: https://patch.msgid.link/[email protected]

Author: Thomas-fourier

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;