spi: img-spfi: Verify max spfi transfer length

Maximum transfer length supported by SPFI is 65535, this is limited
by the number of bits available in SPFI TSize register to represent
the transfer size.
For transfer requests larger than the maximum supported the driver
will return an invalid argument error.

Signed-off-by: Sifan Naeem <sifan.naeem@imgtec.com>
Reviewed-by: Andrew Bresticker <abrestic@chromium.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/spi/spi-img-spfi.c b/drivers/spi/spi-img-spfi.c
index c01567d53581..e649bc7d4c08 100644
--- a/drivers/spi/spi-img-spfi.c
+++ b/drivers/spi/spi-img-spfi.c
@@ -459,6 +459,13 @@ static int img_spfi_transfer_one(struct spi_master *master,
         unsigned long flags;
         int ret;
 
+        if (xfer->len > SPFI_TRANSACTION_TSIZE_MASK) {
+                dev_err(spfi->dev,
+                        "Transfer length (%d) is greater than the max supported (%d)",
+                        xfer->len, SPFI_TRANSACTION_TSIZE_MASK);
+                return -EINVAL;
+        }
+
         /*
          * Stop all DMA and reset the controller if the previous transaction
          * timed-out and never completed it's DMA.