From 6cefd05f35177ad5d22d44519c680cf43f2ac86d Mon Sep 17 00:00:00 2001 From: Pierre Ossman 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 --- 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 17701c3da733..b27c1a28a7ca 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); -- GitLab