kernel/drivers/misc/mei/interrupt.c, branch linux-4.16.y

mei: validate the message header only in first fragment.

2017-06-13T13:46:18Z

RX message header is received in the first fragment of the message and saved side and it is not modified after that, we don't need to validate it upon each fragment. Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman

mei: drop amthif internal client

2017-04-08T15:38:25Z

AMTHIF has special support in the mei drive, it handles multiplexing multiple user space connection above single me client connection. Since there is no additional addressing information there is a strict requirement on the traffic order on each connection and on the "read after write" order within the connection. This creates a lot of complexity mostly because the other client types do not necessarily fall under the same restriction. After carefully studying the use of the AMTHIF client, we came to conclusion that the multiplexing is not really utilized by any application and we may safely remove that support and significantly simplify the driver. Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman

mei: replace callback structures used as list head by list_head

2017-01-31T10:07:43Z

mei_dev structure used struct mei_cl_cb type variables as for holding callbacks list heads. Replace them by the actual struct list_head as there is no other info that is handled. This slims down the mei_dev structure and mostly streamline the code. Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman

mei: consolidate repeating code in mei_cl_irq_read_msg

2016-11-15T09:56:52Z

A cb is always placed on the completion queue during discarding queue. Hence this can be performed upon discard. Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman

mei: stop the stall timer worker if not needed

2016-09-27T10:33:47Z

The stall timer worker checks periodically if there is a stalled i/o transaction. The issue with the current implementation is that the timer is ticking also when there is no pending i/o transaction. This patch provides a simple change that prevents rescheduling of the delayed work when there is no pending i/o. Cc: Andy Lutomirski Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman

mei: enqueue consecutive reads

2016-08-30T12:39:42Z

The FW supports only one pending read per host client, in order to support issuing of consecutive reads the driver queues read requests internally and send them to the firmware after pending one has completed. Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman

mei: drop redundant krealloc and checks in irq read

2016-08-30T12:39:42Z

The read callback is always prepared with MTU-sized buffer and the FW can't send more than the MTU in one message. Checking for buffer existence and krealloc to increase receive buffer size are redundant and may be safely discarded. Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman

mei: add read callback on demand for fixed_address clients

2016-08-30T12:36:39Z

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 Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman

mei: add file pointer to the host client structure

2016-08-30T12:36:39Z

Store the file associated with a client in the host client structure, this enables dropping the special amthif client file pointer from struct mei_device, and this is also a preparation for changing the way rx packet allocation for fixed_address clients Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman

mei: move read cb to complete queue if not connected

2016-08-30T12:36:39Z

Move read cb to the completion queue if a read finds out that client is not connected. This expedite user space reader wake on error condition. Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman