sfc: Consistently report short MCDI responses as EIO

In some cases failing functions were returning 0 which is obviously wrong.
In other cases they were returning inappropriate error codes.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 17 insertions, 11 deletions

diff --git a/drivers/net/sfc/mcdi.c b/drivers/net/sfc/mcdi.c
index c48669c77414..1344afac4673 100644
--- a/drivers/net/sfc/mcdi.c
+++ b/drivers/net/sfc/mcdi.c
@@ -613,7 +613,7 @@ int efx_mcdi_fwver(struct efx_nic *efx, u64 *version, u32 *build)
         }
 
         if (outlength < MC_CMD_GET_VERSION_V1_OUT_LEN) {
-                rc = -EMSGSIZE;
+                rc = -EIO;
                 goto fail;
         }
 
@@ -647,8 +647,10 @@ int efx_mcdi_drv_attach(struct efx_nic *efx, bool driver_operating,
                           outbuf, sizeof(outbuf), &outlen);
         if (rc)
                 goto fail;
-        if (outlen < MC_CMD_DRV_ATTACH_OUT_LEN)
+        if (outlen < MC_CMD_DRV_ATTACH_OUT_LEN) {
+                rc = -EIO;
                 goto fail;
+        }
 
         if (was_attached != NULL)
                 *was_attached = MCDI_DWORD(outbuf, DRV_ATTACH_OUT_OLD_STATE);
@@ -676,7 +678,7 @@ int efx_mcdi_get_board_cfg(struct efx_nic *efx, u8 *mac_address,
                 goto fail;
 
         if (outlen < MC_CMD_GET_BOARD_CFG_OUT_LEN) {
-                rc = -EMSGSIZE;
+                rc = -EIO;
                 goto fail;
         }
 
@@ -738,8 +740,10 @@ int efx_mcdi_nvram_types(struct efx_nic *efx, u32 *nvram_types_out)
                           outbuf, sizeof(outbuf), &outlen);
         if (rc)
                 goto fail;
-        if (outlen < MC_CMD_NVRAM_TYPES_OUT_LEN)
+        if (outlen < MC_CMD_NVRAM_TYPES_OUT_LEN) {
+                rc = -EIO;
                 goto fail;
+        }
 
         *nvram_types_out = MCDI_DWORD(outbuf, NVRAM_TYPES_OUT_TYPES);
         return 0;
@@ -765,8 +769,10 @@ int efx_mcdi_nvram_info(struct efx_nic *efx, unsigned int type,
                           outbuf, sizeof(outbuf), &outlen);
         if (rc)
                 goto fail;
-        if (outlen < MC_CMD_NVRAM_INFO_OUT_LEN)
+        if (outlen < MC_CMD_NVRAM_INFO_OUT_LEN) {
+                rc = -EIO;
                 goto fail;
+        }
 
         *size_out = MCDI_DWORD(outbuf, NVRAM_INFO_OUT_SIZE);
         *erase_size_out = MCDI_DWORD(outbuf, NVRAM_INFO_OUT_ERASESIZE);
@@ -968,7 +974,7 @@ static int efx_mcdi_read_assertion(struct efx_nic *efx)
         if (rc)
                 return rc;
         if (outlen < MC_CMD_GET_ASSERTS_OUT_LEN)
-                return -EINVAL;
+                return -EIO;
 
         /* Print out any recorded assertion state */
         flags = MCDI_DWORD(outbuf, GET_ASSERTS_OUT_GLOBAL_FLAGS);
@@ -1086,7 +1092,7 @@ int efx_mcdi_wol_filter_set(struct efx_nic *efx, u32 type,
                 goto fail;
 
         if (outlen < MC_CMD_WOL_FILTER_SET_OUT_LEN) {
-                rc = -EMSGSIZE;
+                rc = -EIO;
                 goto fail;
         }
 
@@ -1121,7 +1127,7 @@ int efx_mcdi_wol_filter_get_magic(struct efx_nic *efx, int *id_out)
                 goto fail;
 
         if (outlen < MC_CMD_WOL_FILTER_GET_OUT_LEN) {
-                rc = -EMSGSIZE;
+                rc = -EIO;
                 goto fail;
         }
 
diff --git a/drivers/net/sfc/mcdi_phy.c b/drivers/net/sfc/mcdi_phy.c
index 2f2354696663..5d344874f294 100644
--- a/drivers/net/sfc/mcdi_phy.c
+++ b/drivers/net/sfc/mcdi_phy.c
@@ -48,7 +48,7 @@ efx_mcdi_get_phy_cfg(struct efx_nic *efx, struct efx_mcdi_phy_cfg *cfg)
                 goto fail;
 
         if (outlen < MC_CMD_GET_PHY_CFG_OUT_LEN) {
-                rc = -EMSGSIZE;
+                rc = -EIO;
                 goto fail;
         }
 
@@ -111,7 +111,7 @@ static int efx_mcdi_loopback_modes(struct efx_nic *efx, u64 *loopback_modes)
                 goto fail;
 
         if (outlen < MC_CMD_GET_LOOPBACK_MODES_OUT_LEN) {
-                rc = -EMSGSIZE;
+                rc = -EIO;
                 goto fail;
         }
 
@@ -587,7 +587,7 @@ static int efx_mcdi_phy_test_alive(struct efx_nic *efx)
                 return rc;
 
         if (outlen < MC_CMD_GET_PHY_STATE_OUT_LEN)
-                return -EMSGSIZE;
+                return -EIO;
         if (MCDI_DWORD(outbuf, GET_PHY_STATE_STATE) != MC_CMD_PHY_STATE_OK)
                 return -EINVAL;