1 files changed, 18 insertions, 1 deletions

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index b09ccb7223e5..1f8832699cdf 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -794,7 +794,24 @@ static int mmci_pio_read(struct mmci_host *host, char *buffer, unsigned int rema
                 if (count <= 0)
                         break;
 
-                readsl(base + MMCIFIFO, ptr, count >> 2);
+                /*
+                 * SDIO especially may want to send something that is
+                 * not divisible by 4 (as opposed to card sectors
+                 * etc). Therefore make sure to always read the last bytes
+                 * while only doing full 32-bit reads towards the FIFO.
+                 */
+                if (unlikely(count & 0x3)) {
+                        if (count < 4) {
+                                unsigned char buf[4];
+                                readsl(base + MMCIFIFO, buf, 1);
+                                memcpy(ptr, buf, count);
+                        } else {
+                                readsl(base + MMCIFIFO, ptr, count >> 2);
+                                count &= ~0x3;
+                        }
+                } else {
+                        readsl(base + MMCIFIFO, ptr, count >> 2);
+                }
 
                 ptr += count;
                 remain -= count;