mmc: at91_mci: disable handling of blocks with size not multiple of 4 bytes

This kind of transfer is not supported, so don't advertise it and make it
fail early.

Signed-off-by: Marc Pignat <marc.pignat@hevs.ch>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/mmc/host/at91_mci.c b/drivers/mmc/host/at91_mci.c
index 8ec317802347..6ba98a49612d 100644
--- a/drivers/mmc/host/at91_mci.c
+++ b/drivers/mmc/host/at91_mci.c
@@ -428,6 +428,14 @@ static void at91_mci_send_command(struct at91mci_host *host, struct mmc_command
         }
 
         if (data) {
+
+                if ( data->blksz & 0x3 ) {
+                        pr_debug("Unsupported block size\n");
+                        cmd->error = -EINVAL;
+                        mmc_request_done(host->mmc, host->request);
+                        return;
+                }
+
                 block_length = data->blksz;
                 blocks = data->blocks;