[PATCH v2 1/3] spi: return error if kmap'd buffers passed to spi_map_buf()

From: Vignesh R
Date: Mon Apr 25 2016 - 05:53:26 EST


Current spi_map_buf() implementation supports creates sg_table for
vmalloc'd and kmalloc'd buffers. Therefore return error if kmap'd buffer
(or any other buffer) is passed to spi_map_buf().

Signed-off-by: Vignesh R <vigneshr@xxxxxx>
---

v2: New patch

drivers/spi/spi.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index a7ab330d0640..82126bbe69cf 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -717,9 +717,11 @@ static int spi_map_buf(struct spi_master *master, struct device *dev,
if (vmalloced_buf) {
desc_len = min_t(int, max_seg_size, PAGE_SIZE);
sgs = DIV_ROUND_UP(len + offset_in_page(buf), desc_len);
- } else {
+ } else if (virt_addr_valid(buf)) {
desc_len = min_t(int, max_seg_size, master->max_dma_len);
sgs = DIV_ROUND_UP(len, desc_len);
+ } else {
+ return -EINVAL;
}

ret = sg_alloc_table(sgt, sgs, GFP_KERNEL);
--
2.8.1