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