From b189e7589f6d3411e85c6b7ae6eef158f08f388f Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@lst.de>
Date: Fri, 18 May 2018 19:18:44 +0200
Subject: [PATCH] mmc: mxcmmc: handle highmem pages
Use kmap_atomic to map the scatterlist entry before using it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
---
drivers/mmc/host/mxcmmc.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/drivers/mmc/host/mxcmmc.c b/drivers/mmc/host/mxcmmc.c
index 5ff8ef7223cc4..150fbdba777d7 100644
--- a/drivers/mmc/host/mxcmmc.c
+++ b/drivers/mmc/host/mxcmmc.c
@@ -291,8 +291,10 @@ static void mxcmci_swap_buffers(struct mmc_data *data)
struct scatterlist *sg;
int i;
- for_each_sg(data->sg, sg, data->sg_len, i)
- buffer_swap32(sg_virt(sg), sg->length);
+ for_each_sg(data->sg, sg, data->sg_len, i) {
+ void *buf = kmap_atomic(sg_page(sg) + sg->offset;
+ buffer_swap32(buf, sg->length);
+ kunmap_atomic(buf);
}
#else
static inline void mxcmci_swap_buffers(struct mmc_data *data) {}
@@ -609,6 +611,7 @@ static int mxcmci_transfer_data(struct mxcmci_host *host)
{
struct mmc_data *data = host->req->data;
struct scatterlist *sg;
+ void *buf;
int stat, i;
host->data = data;
@@ -616,14 +619,18 @@ static int mxcmci_transfer_data(struct mxcmci_host *host)
if (data->flags & MMC_DATA_READ) {
for_each_sg(data->sg, sg, data->sg_len, i) {
- stat = mxcmci_pull(host, sg_virt(sg), sg->length);
+ buf = kmap_atomic(sg_page(sg) + sg->offset);
+ stat = mxcmci_pull(host, buf, sg->length);
+ kunmap(buf);
if (stat)
return stat;
host->datasize += sg->length;
}
} else {
for_each_sg(data->sg, sg, data->sg_len, i) {
- stat = mxcmci_push(host, sg_virt(sg), sg->length);
+ buf = kmap_atomic(sg_page(sg) + sg->offset);
+ stat = mxcmci_push(host, buf, sg->length);
+ kunmap(buf);
if (stat)
return stat;
host->datasize += sg->length;
--
GitLab