[PATCH 5/7] mmc: omap: Map the virtual page for PIO

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Use kmap_local_page() instead of sg_virt() to obtain a page
from the scatterlist: sg_virt() will not perform bounce
buffering if the page happens to be located in high memory,
which the driver may or may not be using.

Suggested-by: Christoph Hellwig <hch@xxxxxx>
Link: https://lore.kernel.org/linux-mmc/20240122073423.GA25859@xxxxxx/
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
 drivers/mmc/host/omap.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c
index 9fb8995b43a1..3e36480b22ad 100644
--- a/drivers/mmc/host/omap.c
+++ b/drivers/mmc/host/omap.c
@@ -659,7 +659,7 @@ mmc_omap_sg_to_buf(struct mmc_omap_host *host)
 
 	sg = host->data->sg + host->sg_idx;
 	host->buffer_bytes_left = sg->length;
-	host->buffer = sg_virt(sg);
+	host->buffer = kmap_local_page(sg_page(sg));
 	if (host->buffer_bytes_left > host->total_bytes_left)
 		host->buffer_bytes_left = host->total_bytes_left;
 }
@@ -691,6 +691,11 @@ mmc_omap_xfer_data(struct mmc_omap_host *host, int write)
 	nwords = DIV_ROUND_UP(n, 2);
 
 	host->buffer_bytes_left -= n;
+	if (host->buffer_bytes_left == 0) {
+		kunmap_local(host->buffer);
+		host->buffer = NULL;
+	}
+
 	host->total_bytes_left -= n;
 	host->data->bytes_xfered += n;
 

-- 
2.34.1





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