powerpc/iseries: Fix oops reading from /proc/iSeries/mf/*/cmdline

That code uses dma_mapping_error() with a NULL device, which is
a bad idea :-) The proper fix might be to start using some kind
of pseudo device for all these low level mappings with the
hypervisor but that will be for another day. Since it directly
calls into the low level iommu code, I see no problem in having
it directly test against DMA_ERROR_CODE instead of using the
accessors with a NULL argument for now.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/platforms/iseries/mf.c b/arch/powerpc/platforms/iseries/mf.c
index fef4d5150517474460aa5c97bea5efb5c32254f9..0d9343df35bc7658e54cd823eef7660631aa1003 100644 (file)
--- a/arch/powerpc/platforms/iseries/mf.c
+++ b/arch/powerpc/platforms/iseries/mf.c
@@ -872,7 +872,7 @@ static int proc_mf_dump_cmdline(char *page, char **start, off_t off,
                count = 256 - off;
 
        dma_addr = iseries_hv_map(page, off + count, DMA_FROM_DEVICE);
-       if (dma_mapping_error(NULL, dma_addr))
+       if (dma_addr == DMA_ERROR_CODE)
                return -ENOMEM;
        memset(page, 0, off + count);
        memset(&vsp_cmd, 0, sizeof(vsp_cmd));