[PATCH] mmci: calculate remaining bytes at error correctly

[linux@arm.linux.org.uk (Russell King - ARM Linux)]

On Sun, Jan 30, 2011 at 09:28:56PM +0000, Russell King - ARM Linux wrote:
> Linus,
> 
> Here's another couple of fixes...
8<-----
Subject: [PATCH 2/2] ARM: mmci: round down the bytes transferred on error

We should not report incomplete blocks on error.  Return the number of
bytes successfully transferred, rounded down to the nearest block.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 drivers/mmc/host/mmci.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 175a623..0de1602 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -289,13 +289,13 @@ mmci_data_irq(struct mmci_host *host, struct mmc_data *data,
 		dev_dbg(mmc_dev(host->mmc), "MCI ERROR IRQ (status %08x)\n", status);
 		if (status & MCI_DATACRCFAIL) {
 			/* Last block was not successful */
-			host->data_xfered = ((success - 1) / data->blksz) * data->blksz;
+			host->data_xfered = (success - 1) & ~(data->blksz - 1);
 			data->error = -EILSEQ;
 		} else if (status & MCI_DATATIMEOUT) {
-			host->data_xfered = success;
+			host->data_xfered = success & ~(data->blksz - 1);
 			data->error = -ETIMEDOUT;
 		} else if (status & (MCI_TXUNDERRUN|MCI_RXOVERRUN)) {
-			host->data_xfered = success;
+			host->data_xfered = success & ~(data->blksz - 1);
 			data->error = -EIO;
 		}
 
-- 
1.6.2.5