From 6cefd05f35177ad5d22d44519c680cf43f2ac86d Mon Sep 17 00:00:00 2001
From: Pierre Ossman <drzeus@drzeus.cx>
Date: Mon, 21 Jul 2008 00:45:15 +0200
Subject: [PATCH] sdhci: add warnings for bad buffers in ADMA path
The ADMA code path assumes that the 3 byte alignment fix doesn't cross
a page boundary. I'm not convinced this is worth supporting, but at
least print a warning in the off chance we'll actually see such a request.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
---
drivers/mmc/host/sdhci.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 17701c3da7332..b27c1a28a7cad 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -389,6 +389,7 @@ static int sdhci_adma_table_pre(struct sdhci_host *host,
if (offset) {
if (data->flags & MMC_DATA_WRITE) {
buffer = sdhci_kmap_atomic(sg, &flags);
+ WARN_ON(((long)buffer & PAGE_MASK) > (PAGE_SIZE - 3));
memcpy(align, buffer, offset);
sdhci_kunmap_atomic(buffer, &flags);
}
@@ -510,6 +511,7 @@ static void sdhci_adma_table_post(struct sdhci_host *host,
size = 4 - (sg_dma_address(sg) & 0x3);
buffer = sdhci_kmap_atomic(sg, &flags);
+ WARN_ON(((long)buffer & PAGE_MASK) > (PAGE_SIZE - 3));
memcpy(buffer, align, size);
sdhci_kunmap_atomic(buffer, &flags);
--
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