1 From 5eb927e238d953d7b471d4c81cb6ba0303dad02c Mon Sep 17 00:00:00 2001
2 From: Phil Elwell <phil@raspberrypi.org>
3 Date: Wed, 13 Mar 2019 14:19:11 +0000
4 Subject: [PATCH 379/773] bcm2835-sdhost: Allow for sg entries that cross pages
6 The dma_complete handling code calculates a virtual address for a page
7 then adds an offset, but if the offset is more than a page and HIGHMEM
8 is in use then the summed address could be in an unmapped (or just
11 The upstream SDHOST driver allows for this possibility - copy the code
14 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
16 drivers/mmc/host/bcm2835-sdhost.c | 5 +++++
17 1 file changed, 5 insertions(+)
19 --- a/drivers/mmc/host/bcm2835-sdhost.c
20 +++ b/drivers/mmc/host/bcm2835-sdhost.c
21 @@ -543,6 +543,11 @@ static void bcm2835_sdhost_dma_complete(
25 + if (host->drain_offset & PAGE_MASK) {
26 + host->drain_page += host->drain_offset >> PAGE_SHIFT;
27 + host->drain_offset &= ~PAGE_MASK;
30 page = kmap_atomic(host->drain_page);
31 buf = page + host->drain_offset;