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[02/15] mmc: sdhci: Fix ADMA page boundary warnings

Message ID 1413883585-16299-3-git-send-email-adrian.hunter@intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

Adrian Hunter Oct. 21, 2014, 9:26 a.m. UTC 
Bytes are being copied from/to a single page.  The intent
of the warning is to warn if the page boundary is crossed.
There are two problems.  First, PAGE_MASK is mistaken for
(PAGE_SIZE - 1).  Secondly, instead of using the number
of bytes to copy, the warning is using the maximum that
that value could be.  Fix both.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 drivers/mmc/host/sdhci.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
diff mbox

Patch

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index c409e87..62d0f5d 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -525,7 +525,8 @@  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));
+				WARN_ON(((long)buffer & (PAGE_SIZE - 1)) >
+					(PAGE_SIZE - offset));
 				memcpy(align, buffer, offset);
 				sdhci_kunmap_atomic(buffer, &flags);
 			}
@@ -630,7 +631,8 @@  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));
+				WARN_ON(((long)buffer & (PAGE_SIZE - 1)) >
+					(PAGE_SIZE - size));
 				memcpy(buffer, align, size);
 				sdhci_kunmap_atomic(buffer, &flags);