mei: propagate error from write routines instead of ENODEV

ENODEV will cause application to try to reconnect since
it assumes that device went through the reset
write errors are not always fatal it can happen due to
resource contention

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

4 files changed, 36 insertions, 27 deletions

diff --git a/drivers/misc/mei/amthif.c b/drivers/misc/mei/amthif.c
index d0fdc134068a..718f3a14c1ca 100644
--- a/drivers/misc/mei/amthif.c
+++ b/drivers/misc/mei/amthif.c
@@ -312,13 +312,13 @@ static int mei_amthif_send_cmd(struct mei_device *dev, struct mei_cl_cb *cb)
                 mei_hdr.me_addr = dev->iamthif_cl.me_client_id;
                 mei_hdr.reserved = 0;
                 dev->iamthif_msg_buf_index += mei_hdr.length;
-                if (mei_write_message(dev, &mei_hdr,
-                                        (unsigned char *)dev->iamthif_msg_buf))
-                        return -ENODEV;
+                ret = mei_write_message(dev, &mei_hdr, dev->iamthif_msg_buf);
+                if (ret)
+                        return ret;
 
                 if (mei_hdr.msg_complete) {
                         if (mei_cl_flow_ctrl_reduce(&dev->iamthif_cl))
-                                return -ENODEV;
+                                return -EIO;
                         dev->iamthif_flow_control_pending = true;
                         dev->iamthif_state = MEI_IAMTHIF_FLOW_CONTROL;
                         dev_dbg(&dev->pdev->dev, "add amthif cb to write waiting list\n");
@@ -458,6 +458,7 @@ int mei_amthif_irq_write_complete(struct mei_cl *cl, struct mei_cl_cb *cb,
         struct mei_msg_hdr mei_hdr;
         size_t len = dev->iamthif_msg_buf_size - dev->iamthif_msg_buf_index;
         u32 msg_slots = mei_data2slots(len);
+        int rets;
 
         mei_hdr.host_addr = cl->host_client_id;
         mei_hdr.me_addr = cl->me_client_id;
@@ -480,16 +481,17 @@ int mei_amthif_irq_write_complete(struct mei_cl *cl, struct mei_cl_cb *cb,
         dev_dbg(&dev->pdev->dev, MEI_HDR_FMT,  MEI_HDR_PRM(&mei_hdr));
 
         *slots -=  msg_slots;
-        if (mei_write_message(dev, &mei_hdr,
-                dev->iamthif_msg_buf + dev->iamthif_msg_buf_index)) {
-                        dev->iamthif_state = MEI_IAMTHIF_IDLE;
-                        cl->status = -ENODEV;
-                        list_del(&cb->list);
-                        return -ENODEV;
+        rets = mei_write_message(dev, &mei_hdr,
+                        dev->iamthif_msg_buf + dev->iamthif_msg_buf_index);
+        if (rets) {
+                dev->iamthif_state = MEI_IAMTHIF_IDLE;
+                cl->status = rets;
+                list_del(&cb->list);
+                return rets;
         }
 
         if (mei_cl_flow_ctrl_reduce(cl))
-                return -ENODEV;
+                return -EIO;
 
         dev->iamthif_msg_buf_index += mei_hdr.length;
         cl->status = 0;
diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c
index bccc3164ea4c..1a53d961302a 100644
--- a/drivers/misc/mei/client.c
+++ b/drivers/misc/mei/client.c
@@ -706,6 +706,7 @@ int mei_cl_irq_write_complete(struct mei_cl *cl, struct mei_cl_cb *cb,
         struct mei_msg_hdr mei_hdr;
         size_t len = cb->request_buffer.size - cb->buf_idx;
         u32 msg_slots = mei_data2slots(len);
+        int rets;
 
         mei_hdr.host_addr = cl->host_client_id;
         mei_hdr.me_addr = cl->me_client_id;
@@ -729,11 +730,12 @@ int mei_cl_irq_write_complete(struct mei_cl *cl, struct mei_cl_cb *cb,
                         cb->request_buffer.size, cb->buf_idx);
 
         *slots -=  msg_slots;
-        if (mei_write_message(dev, &mei_hdr,
-                        cb->request_buffer.data + cb->buf_idx)) {
-                cl->status = -ENODEV;
+        rets = mei_write_message(dev, &mei_hdr,
+                        cb->request_buffer.data + cb->buf_idx);
+        if (rets) {
+                cl->status = rets;
                 list_move_tail(&cb->list, &cmpl_list->list);
-                return -ENODEV;
+                return rets;
         }
 
         cl->status = 0;
@@ -742,7 +744,7 @@ int mei_cl_irq_write_complete(struct mei_cl *cl, struct mei_cl_cb *cb,
 
         if (mei_hdr.msg_complete) {
                 if (mei_cl_flow_ctrl_reduce(cl))
-                        return -ENODEV;
+                        return -EIO;
                 list_move_tail(&cb->list, &dev->write_waiting_list.list);
         }
 
@@ -811,10 +813,9 @@ int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, bool blocking)
         mei_hdr.reserved = 0;
 
 
-        if (mei_write_message(dev, &mei_hdr, buf->data)) {
-                rets = -EIO;
+        rets = mei_write_message(dev, &mei_hdr, buf->data);
+        if (rets)
                 goto err;
-        }
 
         cl->writing_state = MEI_WRITING;
         cb->buf_idx = mei_hdr.length;
diff --git a/drivers/misc/mei/hbm.c b/drivers/misc/mei/hbm.c
index f706fe8a3286..f1c974a0bc0d 100644
--- a/drivers/misc/mei/hbm.c
+++ b/drivers/misc/mei/hbm.c
@@ -170,7 +170,7 @@ int mei_hbm_start_req(struct mei_device *dev)
                 dev_err(&dev->pdev->dev, "version message write failed\n");
                 dev->dev_state = MEI_DEV_RESETTING;
                 mei_reset(dev, 1);
-                return -ENODEV;
+                return -EIO;
         }
         dev->hbm_state = MEI_HBM_START;
         dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c
index be42c700b15a..e4bb9aee40a1 100644
--- a/drivers/misc/mei/interrupt.c
+++ b/drivers/misc/mei/interrupt.c
@@ -216,9 +216,11 @@ static int mei_cl_irq_read(struct mei_cl *cl, struct mei_cl_cb *cb,
                            s32 *slots, struct mei_cl_cb *cmpl_list)
 {
         struct mei_device *dev = cl->dev;
-
         u32 msg_slots = mei_data2slots(sizeof(struct hbm_flow_control));
 
+        int ret;
+
+
         if (*slots < msg_slots) {
                 /* return the cancel routine */
                 list_del(&cb->list);
@@ -227,12 +229,14 @@ static int mei_cl_irq_read(struct mei_cl *cl, struct mei_cl_cb *cb,
 
         *slots -= msg_slots;
 
-        if (mei_hbm_cl_flow_control_req(dev, cl)) {
-                cl->status = -ENODEV;
+        ret = mei_hbm_cl_flow_control_req(dev, cl);
+        if (ret) {
+                cl->status = ret;
                 cb->buf_idx = 0;
                 list_move_tail(&cb->list, &cmpl_list->list);
-                return -ENODEV;
+                return ret;
         }
+
         list_move_tail(&cb->list, &dev->read_list.list);
 
         return 0;
@@ -254,6 +258,7 @@ static int mei_cl_irq_ioctl(struct mei_cl *cl, struct mei_cl_cb *cb,
                            s32 *slots, struct mei_cl_cb *cmpl_list)
 {
         struct mei_device *dev = cl->dev;
+        int ret;
 
         u32 msg_slots =
                 mei_data2slots(sizeof(struct hbm_client_connect_request));
@@ -268,11 +273,12 @@ static int mei_cl_irq_ioctl(struct mei_cl *cl, struct mei_cl_cb *cb,
 
         cl->state = MEI_FILE_CONNECTING;
 
-        if (mei_hbm_cl_connect_req(dev, cl)) {
-                cl->status = -ENODEV;
+        ret = mei_hbm_cl_connect_req(dev, cl);
+        if (ret) {
+                cl->status = ret;
                 cb->buf_idx = 0;
                 list_del(&cb->list);
-                return -ENODEV;
+                return ret;
         }
 
         list_move_tail(&cb->list, &dev->ctrl_rd_list.list);