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mei: cleanup status before client dma setup call

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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>
This commit is contained in:
Alexander Usyskin 2021-12-23 11:47:05 +02:00 committed by Greg Kroah-Hartman
parent 38be5687da
commit 43aa323e31
1 changed files with 4 additions and 0 deletions
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4
drivers/misc/mei/client.c
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@ -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,