[PATCH 4.14 105/146] net/mlx5: FPGA, return -EINVAL if size is zero

[Greg Kroah-Hartman]

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Kamal Heib <kamalh@xxxxxxxxxxxx>


[ Upstream commit bae115a2bb479142605726e6aa130f43f50e801a ]

Currently, if a size of zero is passed to
mlx5_fpga_mem_{read|write}_i2c()
the "err" return value will not be initialized, which triggers gcc
warnings:

[..]/mlx5/core/fpga/sdk.c:87 mlx5_fpga_mem_read_i2c() error:
uninitialized symbol 'err'.
[..]/mlx5/core/fpga/sdk.c:115 mlx5_fpga_mem_write_i2c() error:
uninitialized symbol 'err'.

fix that.

Fixes: a9956d35d199 ('net/mlx5: FPGA, Add SBU infrastructure')
Signed-off-by: Kamal Heib <kamalh@xxxxxxxxxxxx>
Reviewed-by: Yevgeny Kliteynik <kliteyn@xxxxxxxxxxxx>
Signed-off-by: Saeed Mahameed <saeedm@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/net/ethernet/mellanox/mlx5/core/fpga/sdk.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- 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
 	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(struc
 	u8 actual_size;
 	int err;
 
+	if (!size)
+		return -EINVAL;
+
 	if (!fdev->mdev)
 		return -ENOTCONN;