[PATCH 3/5] env: sf: Preserve and free the previous flash

[Jagan Teki]

env_flash is a global flash pointer, and the probe would
happen only if env_flash is NULL, but there is no checking
and free the pointer if is not NULL.

So, this patch frees the env_flash if it's not NULL, and
get the probed flash in new flash pointer and finally
assign into env_flash.

Note: Similar approach has been followed and tested in
cmd/sf.c

Cc: Simon Glass <s...@chromium.org>
Cc: Vignesh R <vigne...@ti.com>
Signed-off-by: Jagan Teki <ja...@amarulasolutions.com>
---
 env/sf.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/env/sf.c b/env/sf.c
index 64c57f2cdf..af59c8375c 100644
--- a/env/sf.c
+++ b/env/sf.c
@@ -50,15 +50,17 @@ static int setup_flash_device(void)
 
        env_flash = dev_get_uclass_priv(new);
 #else
+       struct spi_flash *new;
 
-       if (!env_flash) {
-               env_flash = spi_flash_probe(CONFIG_ENV_SPI_BUS,
-                       CONFIG_ENV_SPI_CS,
-                       CONFIG_ENV_SPI_MAX_HZ, CONFIG_ENV_SPI_MODE);
-               if (!env_flash) {
-                       env_set_default("spi_flash_probe() failed", 0);
-                       return -EIO;
-               }
+       if (env_flash)
+               spi_flash_free(env_flash);
+
+       new = spi_flash_probe(CONFIG_ENV_SPI_BUS, CONFIG_ENV_SPI_CS,
+                             CONFIG_ENV_SPI_MAX_HZ, CONFIG_ENV_SPI_MODE);
+       env_flash = new;
+       if (!new) {
+               env_set_default("spi_flash_probe() failed", 0);
+               return -EIO;
        }
 #endif
        return 0;
-- 
2.20.1