[net 3/6] net/mlx5: FPGA, return -EINVAL if size is zero

[Saeed Mahameed]

From: Kamal Heib <kam...@mellanox.com>

In the current code, if a size of zero is passed to
mlx5_fpga_mem_{read|write}_i2c() functions the "err"
return value will not initialized.

Fixes: a9956d35d199 ('net/mlx5: FPGA, Add SBU infrastructure')
Signed-off-by: Kamal Heib <kam...@mellanox.com>
Reviewed-by: Yevgeny Kliteynik <klit...@mellanox.com>
Signed-off-by: Saeed Mahameed <sae...@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/fpga/sdk.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fpga/sdk.c 
b/drivers/net/ethernet/mellanox/mlx5/core/fpga/sdk.c
index 3c11d6e2160a..14962969c5ba 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/fpga/sdk.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/fpga/sdk.c
@@ -66,6 +66,9 @@ static int mlx5_fpga_mem_read_i2c(struct mlx5_fpga_device 
*fdev, size_t size,
        u8 actual_size;
        int err;
 
+       if (!size)
+               return -EINVAL;
+
        if (!fdev->mdev)
                return -ENOTCONN;
 
@@ -95,6 +98,9 @@ static int mlx5_fpga_mem_write_i2c(struct mlx5_fpga_device 
*fdev, size_t size,
        u8 actual_size;
        int err;
 
+       if (!size)
+               return -EINVAL;
+
        if (!fdev->mdev)
                return -ENOTCONN;
 
-- 
2.14.2