[PATCH v1 1/1] spi: Don't overwrite num_chipselect with error code

[Andy Shevchenko]

The code currently organized in a way that num_chipselect is overwritten
each time we call spi_get_gpio_descs(). It might be potentially dangerous
in case when the gpiod_count() returns an error code.

Note, that gpiod_count() never returns 0, take this into account as well.

Fixes: f3186dd87669 ("spi: Optionally use GPIO descriptors for CS GPIOs")
Signed-off-by: Andy Shevchenko <andriy.shevche...@linux.intel.com>
---
 drivers/spi/spi.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 74b2b1dd358b..36c46feab6d4 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -2558,13 +2558,14 @@ static int spi_get_gpio_descs(struct spi_controller 
*ctlr)
        unsigned int num_cs_gpios = 0;
 
        nb = gpiod_count(dev, "cs");
-       ctlr->num_chipselect = max_t(int, nb, ctlr->num_chipselect);
-
-       /* No GPIOs at all is fine, else return the error */
-       if (nb == 0 || nb == -ENOENT)
-               return 0;
-       else if (nb < 0)
+       if (nb < 0) {
+               /* No GPIOs at all is fine, else return the error */
+               if (nb == -ENOENT)
+                       return 0;
                return nb;
+       }
+
+       ctlr->num_chipselect = max_t(int, nb, ctlr->num_chipselect);
 
        cs = devm_kcalloc(dev, ctlr->num_chipselect, sizeof(*cs),
                          GFP_KERNEL);
-- 
2.30.2