sparc32: remove the call to dma_make_coherent in arch_dma_free

Christoph Hellwig · Christoph Hellwig · commit 2c38d6a4e959 · 2021-10-21T13:02:41.000+02:00
LEON only needs snooping when DMA accesses are not seen on the processor
bus.  Given that coherent allocations are mapped uncached this can't
happen for those allocations.

Signed-off-by: Christoph Hellwig &lt;hch@lst.de&gt;
Tested-by: Andreas Larsson &lt;andreas@gaisler.com&gt;
Acked-by: David S. Miller &lt;davem@davemloft.net&gt;
diff --git a/arch/sparc/kernel/ioport.c b/arch/sparc/kernel/ioport.c
@@ -361,7 +361,6 @@ void arch_dma_free(struct device *dev, size_t size, void *cpu_addr,
 	if (!sparc_dma_free_resource(cpu_addr, size))
 		return;
 
-	dma_make_coherent(dma_addr, size);
 	srmmu_unmapiorange((unsigned long)cpu_addr, size);
 	free_pages((unsigned long)phys_to_virt(dma_addr), get_order(size));
 }

Original file line number	Diff line number	Diff line change
`@@ -361,7 +361,6 @@ void arch_dma_free(struct device dev, size_t size, void cpu_addr,`
`361`	`361`	`if (!sparc_dma_free_resource(cpu_addr, size))`
`362`	`362`	`return;`
`363`	`363`
`364`		`- dma_make_coherent(dma_addr, size);`
`365`	`364`	`srmmu_unmapiorange((unsigned long)cpu_addr, size);`
`366`	`365`	`free_pages((unsigned long)phys_to_virt(dma_addr), get_order(size));`
`367`	`366`	`}`