mei: cleanup status before client dma setup call

The upper layer may retry call to mei_cl_dma_alloc_and_map(),
in that case the client status may be non-zero after the previous call
and the wait condition will be true immediately.
Set cl->status to zero to allow waiting for an actual result
from the firmware.

Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Link: https://lore.kernel.org/r/20211223094705.204624-2-tomas.winkler@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c
index 96f4e59..22be86a 100644 (file)
--- a/drivers/misc/mei/client.c
+++ b/drivers/misc/mei/client.c
@@ -2327,6 +2327,8 @@ int mei_cl_dma_alloc_and_map(struct mei_cl *cl, const struct file *fp,
                list_move_tail(&cb->list, &dev->ctrl_rd_list);
        }
 
+       cl->status = 0;
+
        mutex_unlock(&dev->device_lock);
        wait_event_timeout(cl->wait,
                           cl->dma_mapped || cl->status,
@@ -2404,6 +2406,8 @@ int mei_cl_dma_unmap(struct mei_cl *cl, const struct file *fp)
                list_move_tail(&cb->list, &dev->ctrl_rd_list);
        }
 
+       cl->status = 0;
+
        mutex_unlock(&dev->device_lock);
        wait_event_timeout(cl->wait,
                           !cl->dma_mapped || cl->status,