mei: make return values consistent across the driver

1. Propagate ENOTTY  to user space if the client is not present
in the system
2. Use ETIME consistently on timeouts
3. Return EIO on write failures
4. Return ENODEV on recoverable device failures such as resets

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

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c
index e6151e2dac48..31cb3452b9d7 100644
--- a/drivers/misc/mei/interrupt.c
+++ b/drivers/misc/mei/interrupt.c
@@ -350,7 +350,7 @@ int mei_irq_read_handler(struct mei_device *dev,
                 dev_err(&dev->pdev->dev, "less data available than length=%08x.\n",
                                 *slots);
                 /* we can't read the message */
-                ret = -ERANGE;
+                ret = -EBADMSG;
                 goto end;
         }
 
@@ -483,7 +483,7 @@ int mei_irq_write_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list)
                         if (mei_wd_send(dev))
                                 dev_dbg(&dev->pdev->dev, "wd send failed.\n");
                         else if (mei_cl_flow_ctrl_reduce(&dev->wd_cl))
-                                return -ENODEV;
+                                return -EIO;
                         dev->wd_pending = false;
                 }
         }