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mei: bus: enable non-blocking RX

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Enable non-blocking receive for drivers on mei bus, this allows checking
for data availability by mei client drivers. This is most effective for
fixed address clients, that lacks flow control.

This function adds new API function mei_cldev_recv_nonblock(), it
retuns -EGAIN if function will block.

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>
This commit is contained in:
Alexander Usyskin
2016-12-03 00:15:25 +02:00
committed by Greg Kroah-Hartman
parent a2eb0fc07f
commit 076802d006
4 changed files with 41 additions and 7 deletions
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4
drivers/misc/mei/bus-fixup.c
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@@ -141,7 +141,7 @@ static int mei_osver(struct mei_cl_device *cldev)
if (ret < 0)
return ret;
ret = __mei_cl_recv(cldev->cl, buf, length);
ret = __mei_cl_recv(cldev->cl, buf, length, 0);
if (ret < 0)
return ret;
@@ -272,7 +272,7 @@ static int mei_nfc_if_version(struct mei_cl *cl,
return -ENOMEM;
ret = 0;
bytes_recv = __mei_cl_recv(cl, (u8 *)reply, if_version_length);
bytes_recv = __mei_cl_recv(cl, (u8 *)reply, if_version_length, 0);
if (bytes_recv < if_version_length) {
dev_err(bus->dev, "Could not read IF version\n");
ret = -EIO;