The buffer descriptor setup loop is correct only if it is setting up at
least one bd struct. Besides, there is an error somewhere if
dma_map_sg() returns 0. So add a paranoid check for this condition.
Signed-off-by: George Hilliard <thirtythreefo...@gmail.com>
---
drivers/staging/mt7621-mmc/sd.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/staging/mt7621-mmc/sd.c b/drivers/staging/mt7621-mmc/sd.c
index 942c0d63d710..736e1d23b391 100644
--- a/drivers/staging/mt7621-mmc/sd.c
+++ b/drivers/staging/mt7621-mmc/sd.c
@@ -594,7 +594,12 @@ static void msdc_dma_setup(struct msdc_host *host, struct
msdc_dma *dma,
struct bd *bd;
u32 j;
- BUG_ON(sglen > MAX_BD_NUM); /* not support currently */
+ // Shouldn't happen; we configure the mmc host layer
+ // based on MAX_BD_NUM:
+ BUG_ON(sglen > MAX_BD_NUM);
+ // Correct setup below requires at least one bd
+ // (and dma_map_sg should not return 0):
+ BUG_ON(sglen == 0);
gpd = dma->gpd;
bd = dma->bd;
--
2.20.1
