sf: Fix NULL pointer exception for flashes without lock methods
commit c3c016c "sf: Add SPI NOR protection mechanism" introduced
flash_lock()/flash_unlock()/flash_is_locked() methods for SPI flash,
but not every flash driver supplies these. We should test these
methods against NULL before actually calling them.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Fabio Estevam <fabio.estevam@freescale.com>
Reviewed-by: Jagan Teki <jteki@openedev.com>
diff --git a/include/spi_flash.h b/include/spi_flash.h
index 0ae0062..f25b3e7 100644
--- a/include/spi_flash.h
+++ b/include/spi_flash.h
@@ -237,7 +237,7 @@
static inline int spi_flash_protect(struct spi_flash *flash, u32 ofs, u32 len,
bool prot)
{
- if (!flash->flash_lock)
+ if (!flash->flash_lock || !flash->flash_unlock)
return -EOPNOTSUPP;
if (prot)