Read/write callbacks registered with nvmem core expect 0 to be returned
on success and a negative value to be returned on failure.
meson_efuse_read() and meson_efuse_write() call into
meson_sm_call_read() and meson_sm_call_write() respectively which return
the number of bytes read or written on success as per their api
description.
Fix to return error if meson_sm_call_read()/meson_sm_call_write()
returns an error else return 0.
Fixes: a29a63bdaf6f ("nvmem: meson-efuse: simplify read callback")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Joy Chakraborty <joychakr@xxxxxxxxxx>
Reviewed-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Reviewed-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240628113704.13742-3-srinivas.kandagatla@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
diff --git a/drivers/nvmem/meson-efuse.c b/drivers/nvmem/meson-efuse.c
index 33678d0af2c2..6c2f80e166e2 100644
--- a/drivers/nvmem/meson-efuse.c
+++ b/drivers/nvmem/meson-efuse.c
@@ -18,18 +18,24 @@ static int meson_efuse_read(void *context, unsigned int offset,
void *val, size_t bytes)
{
struct meson_sm_firmware *fw = context;
+ int ret;
- return meson_sm_call_read(fw, (u8 *)val, bytes, SM_EFUSE_READ, offset,
- bytes, 0, 0, 0);
+ ret = meson_sm_call_read(fw, (u8 *)val, bytes, SM_EFUSE_READ, offset,
+ bytes, 0, 0, 0);
+
+ return ret < 0 ? ret : 0;
}
static int meson_efuse_write(void *context, unsigned int offset,
void *val, size_t bytes)
{
struct meson_sm_firmware *fw = context;
+ int ret;
- return meson_sm_call_write(fw, (u8 *)val, bytes, SM_EFUSE_WRITE, offset,
- bytes, 0, 0, 0);
+ ret = meson_sm_call_write(fw, (u8 *)val, bytes, SM_EFUSE_WRITE, offset,
+ bytes, 0, 0, 0);
+
+ return ret < 0 ? ret : 0;
}
static const struct of_device_id meson_efuse_match[] = {
