diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-4.19/950-0327-bcm2835-sdhost-Allow-for-sg-entries-that-cross-pages.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-4.19/950-0327-bcm2835-sdhost-Allow-for-sg-entries-that-cross-pages.patch | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-4.19/950-0327-bcm2835-sdhost-Allow-for-sg-entries-that-cross-pages.patch b/target/linux/bcm27xx/patches-4.19/950-0327-bcm2835-sdhost-Allow-for-sg-entries-that-cross-pages.patch new file mode 100644 index 0000000000..e16e12da3c --- /dev/null +++ b/target/linux/bcm27xx/patches-4.19/950-0327-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; + |