mtd: rawnand: Fix nand_choose_best_timings() on unsupported interface

[ Upstream commit 36a65982a98c4bc72fdcfef2c4aaf90193746631 ]

When the NV-DDR interface is not supported by the NAND chip,
the value of onfi->nvddr_timing_modes is 0. In this case,
the best_mode variable value in nand_choose_best_nvddr_timings()
is -1. The last for-loop is skipped and the function returns an
uninitialized value.
If this returned value is 0, the nand_choose_best_sdr_timings()
is not executed and no 'best timing' are set. This leads the host
controller and the NAND chip working at default mode 0 timing
even if a better timing can be used.

Fix this uninitialized returned value.

nand_choose_best_sdr_timings() is pretty similar to
nand_choose_best_nvddr_timings(). Even if onfi->sdr_timing_modes
should never be seen as 0, nand_choose_best_sdr_timings() returned
value is fixed.

Fixes: a9ecc8c814e9 ("mtd: rawnand: Choose the best timings, NV-DDR included")
Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20211119150316.43080-3-herve.codina@bootlin.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index 5c6b065..a130320 100644 (file)
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -926,7 +926,7 @@ int nand_choose_best_sdr_timings(struct nand_chip *chip,
                                 struct nand_sdr_timings *spec_timings)
 {
        const struct nand_controller_ops *ops = chip->controller->ops;
-       int best_mode = 0, mode, ret;
+       int best_mode = 0, mode, ret = -EOPNOTSUPP;
 
        iface->type = NAND_SDR_IFACE;
 
@@ -977,7 +977,7 @@ int nand_choose_best_nvddr_timings(struct nand_chip *chip,
                                   struct nand_nvddr_timings *spec_timings)
 {
        const struct nand_controller_ops *ops = chip->controller->ops;
-       int best_mode = 0, mode, ret;
+       int best_mode = 0, mode, ret = -EOPNOTSUPP;
 
        iface->type = NAND_NVDDR_IFACE;