kernel/linux.git/drivers/misc/mei/interrupt.c, branch linux-4.7.y

mei: amthif: discard not read messages

2016-04-30T21:08:08+00:00

When a message is received and amthif client is not in reading state the message is ignored and left dangling in the queue. This may happen after one of the amthif host connections is closed w/o completing the reading. Another client will pick up a wrong message on next read attempt which will lead to link reset. To prevent this the driver has to properly discard the message when amthif client is not in reading state. Cc: #4.2+ Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman

mei: fix NULL dereferencing during FW initiated disconnection

2016-04-30T21:08:08+00:00

In the case when disconnection is initiated from the FW the driver is flushing items from the write control list while iterating over it: mei_irq_write_handler() list_for_each_entry_safe(ctrl_wr_list) <-- outer loop mei_cl_irq_disconnect_rsp() mei_cl_set_disconnected() mei_io_list_flush(ctrl_wr_list) <-- destorying list We move the list flushing to the completion routine. Cc: #4.2+ Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman

mei: fix format string in debug prints

2016-02-20T22:27:36+00:00

buf_idx type was changed to size_t, and few places missed out to change the print format from %ld to %zu. Use also uz for buf.size which is also of size_t Fixes: commit 56988f22e097 ("mei: fix possible integer overflow issue")' Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman

mei: discard replies from unconnected fixed address clients

2016-02-07T22:47:20+00:00

A fixed address client in the FW doesn't have a notion of connection and can send message after the file associated with it was already closed. Silently discard such messages. Add inline helpers to detect whether a message is hbm or intended for a fixed address client Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman

mei: amthif: replace amthif_rd_complete_list with rd_completed

2016-02-07T22:47:20+00:00

Now when we have per client rd_completed list we can remove the amthif specific amthif_rd_complete_list. In addition in the function mei_amthif_read do not loop over the rd_completed list like the original code as the code path is unlocked. Reviewed-by: Alexander Usyskin Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman

mei: rename variable names 'file_object' to fp

2016-02-07T22:47:20+00:00

The driver uses three names file, fp, and file_object for struct file type. To improve code clarity and adjust to my taste rename file_object to more common and shorter fp. Reviewed-by: Alexander Usyskin Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman

mei: amthif: don't drop read packets on timeout

2016-02-07T22:47:20+00:00

Since the driver now uses a list for storing read packets instead of single variable a pending read is no longer blocking other connections. A pending read will be discarded up the file closure. Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman

mei: fix possible integer overflow issue

2016-02-07T22:47:20+00:00

There is a possible integer overflow following by a buffer overflow when accumulating messages coming from the FW to compose a full payload. Occurrence of wrap around has to be prevented for next message size calculation. For unsigned integer the addition overflow has occurred when the result is smaller than one of the arguments. To simplify the fix, the types of buf.size and buf_idx are set to the same width, namely size_t also to be aligned with the type of length parameter in file read/write ops. Signed-off-by: Tomas Winkler Signed-off-by: Alexander Usyskin Signed-off-by: Greg Kroah-Hartman

mei: wd: drop the watchdog code from the core mei driver

2016-02-07T06:11:06+00:00

Instead of integrating the iAMT watchdog in the mei core driver we will create a watchdog device on the mei client bus and create a driver for it. This patch removes the watchdog code from the mei core driver. Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman

mei: keep the device awake during reads in chunks

2015-10-18T04:45:05+00:00

Long messages are read in chunks, to prevent trashing runtime pm between the reading of the chunks we call pm_runtime_mark_last_busy() on non-final chunk message as the next chunk of the same message will be received immediately in the next interrupt with high probablity. Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman