mtd: cqspi: Fix division by zero

Both dummy.nbytes and dummy.buswidth may be zero. By not checking
the later, it is possible to trigger division by zero and a crash.
This does happen with tiny SPI NOR framework in SPL. Fix this by
adding the check and returning zero dummy bytes in such a case.

Fixes: 38b0852b0ea ("spi: cadence-qspi: Add support for octal DTR flashes")
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Jagan Teki <jagan@amarulasolutions.com>
Cc: Vignesh R <vigneshr@ti.com>
Cc: Pratyush Yadav <p.yadav@ti.com>
[trini: Drop Pratyush's RB as his requested changes weren't made as
        Marek disagreed]

diff --git a/drivers/spi/cadence_qspi_apb.c b/drivers/spi/cadence_qspi_apb.c
index c36a652..429ee33 100644 (file)
--- a/drivers/spi/cadence_qspi_apb.c
+++ b/drivers/spi/cadence_qspi_apb.c
@@ -219,6 +219,9 @@ static unsigned int cadence_qspi_calc_dummy(const struct spi_mem_op *op,
 {
        unsigned int dummy_clk;
 
+       if (!op->dummy.nbytes || !op->dummy.buswidth)
+               return 0;
+
        dummy_clk = op->dummy.nbytes * (8 / op->dummy.buswidth);
        if (dtr)
                dummy_clk /= 2;