[PATCH] intel_th: Fix dma_map_sg error check

[Jack Wang]

dma_map_sg return 0 on error.

Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Fixes: 4e0eaf239fb3 ("intel_th: msu: Fix single mode with IOMMU")
Signed-off-by: Jack Wang <jinpu.wang@xxxxxxxxx>
---
 drivers/hwtracing/intel_th/msu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwtracing/intel_th/msu.c b/drivers/hwtracing/intel_th/msu.c
index 6c8215a47a60..b49237d56a60 100644
--- a/drivers/hwtracing/intel_th/msu.c
+++ b/drivers/hwtracing/intel_th/msu.c
@@ -931,7 +931,7 @@ static int msc_buffer_contig_alloc(struct msc *msc, unsigned long size)
 
 	ret = dma_map_sg(msc_dev(msc)->parent->parent, msc->single_sgt.sgl, 1,
 			 DMA_FROM_DEVICE);
-	if (ret < 0)
+	if (!ret)
 		goto err_free_pages;
 
 	msc->nr_pages = nr_pages;
-- 
2.34.1