X-Git-Url: http://git.openwrt.org/?a=blobdiff_plain;f=target%2Flinux%2Fbrcm2708%2Fpatches-4.19%2F950-0329-bcm2835-sdhost-Allow-for-sg-entries-that-cross-pages.patch;fp=target%2Flinux%2Fbrcm2708%2Fpatches-4.19%2F950-0329-bcm2835-sdhost-Allow-for-sg-entries-that-cross-pages.patch;h=e16e12da3cf0aba17a835c4705f5938667460bdd;hb=c2308a7e4adbb2acc8ff149f91d1ca46801c135e;hp=0000000000000000000000000000000000000000;hpb=67dcc43f3a22dc3a7ac07a7065971b426feeb043;p=openwrt%2Fstaging%2Fchunkeey.git

diff --git a/target/linux/brcm2708/patches-4.19/950-0329-bcm2835-sdhost-Allow-for-sg-entries-that-cross-pages.patch b/target/linux/brcm2708/patches-4.19/950-0329-bcm2835-sdhost-Allow-for-sg-entries-that-cross-pages.patch
new file mode 100644
index 0000000000..e16e12da3c
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0329-bcm2835-sdhost-Allow-for-sg-entries-that-cross-pages.patch
@@ -0,0 +1,32 @@
+From 44db7882be675cdf2d89741af5bbeba41b3e25af Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.org>
+Date: Wed, 13 Mar 2019 14:19:11 +0000
+Subject: [PATCH] bcm2835-sdhost: Allow for sg entries that cross pages
+
+The dma_complete handling code calculates a virtual address for a page
+then adds an offset, but if the offset is more than a page and HIGHMEM
+is in use then the summed address could be in an unmapped (or just
+incorrect) page.
+
+The upstream SDHOST driver allows for this possibility - copy the code
+that does so.
+
+Signed-off-by: Phil Elwell <phil@raspberrypi.org>
+---
+ drivers/mmc/host/bcm2835-sdhost.c | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+--- a/drivers/mmc/host/bcm2835-sdhost.c
++++ b/drivers/mmc/host/bcm2835-sdhost.c
+@@ -543,6 +543,11 @@ static void bcm2835_sdhost_dma_complete(
+ 		void *page;
+ 		u32 *buf;
+ 
++		if (host->drain_offset & PAGE_MASK) {
++			host->drain_page += host->drain_offset >> PAGE_SHIFT;
++			host->drain_offset &= ~PAGE_MASK;
++		}
++
+ 		page = kmap_atomic(host->drain_page);
+ 		buf = page + host->drain_offset;
+