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mei: add read callback on demand for fixed_address clients

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The Fixed address clients do not work with the flow control, and the
packet RX callback was allocated upon TX with anticipation of a
following RX. This won't work if the clients with unsolicited Rx. Rather
than preparing read callback upon a write we allocate one directly on
the reciev path if one doesn't exists.

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 2016-06-16 17:58:58 +03:00 committed by Greg Kroah-Hartman
parent 97d549b4d5
commit a808c80cda
2 changed files with 12 additions and 13 deletions
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15
drivers/misc/mei/client.c
View File

@ -1145,26 +1145,19 @@ err:
* mei_cl_flow_ctrl_creds - checks flow_control credits for cl.
*
* @cl: host client
* @fp: the file pointer associated with the pointer
*
* Return: 1 if mei_flow_ctrl_creds >0, 0 - otherwise.
*/
static int mei_cl_flow_ctrl_creds(struct mei_cl *cl, const struct file *fp)
static int mei_cl_flow_ctrl_creds(struct mei_cl *cl)
{
int rets;
if (WARN_ON(!cl || !cl->me_cl))
return -EINVAL;
if (cl->mei_flow_ctrl_creds > 0)
return 1;
if (mei_cl_is_fixed_address(cl)) {
rets = mei_cl_read_start(cl, mei_cl_mtu(cl), fp);
if (rets && rets != -EBUSY)
return rets;
if (mei_cl_is_fixed_address(cl))
return 1;
}
if (mei_cl_is_single_recv_buf(cl)) {
if (cl->me_cl->mei_flow_ctrl_creds > 0)
@ -1537,7 +1530,7 @@ int mei_cl_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
first_chunk = cb->buf_idx == 0;
rets = first_chunk ? mei_cl_flow_ctrl_creds(cl, cb->fp) : 1;
rets = first_chunk ? mei_cl_flow_ctrl_creds(cl) : 1;
if (rets < 0)
return rets;
@ -1643,7 +1636,7 @@ int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, bool blocking)
mei_hdr.msg_complete = 0;
mei_hdr.internal = cb->internal;
rets = mei_cl_flow_ctrl_creds(cl, cb->fp);
rets = mei_cl_flow_ctrl_creds(cl);
if (rets < 0)
goto err;

10
drivers/misc/mei/interrupt.c
View File

@ -107,8 +107,14 @@ int mei_cl_irq_read_msg(struct mei_cl *cl,
cb = list_first_entry_or_null(&cl->rd_pending, struct mei_cl_cb, list);
if (!cb) {
cl_err(dev, cl, "pending read cb not found\n");
goto out;
if (!mei_cl_is_fixed_address(cl)) {
cl_err(dev, cl, "pending read cb not found\n");
goto out;
}
cb = mei_cl_alloc_cb(cl, mei_cl_mtu(cl), MEI_FOP_READ, cl->fp);
if (!cb)
goto out;
list_add_tail(&cb->list, &cl->rd_pending);
}
if (!mei_cl_is_connected(cl)) {