kernel/git/stable/linux.git/drivers/misc/mei, branch linux-4.10.y

mei: don't wait for os version message reply

2017-03-30T07:44:06+00:00

commit c6240cacdb2c3cb56a21fb3ea0c105154ab87a2a upstream. The driver still struggles with firmwares that do not replay to the OS version request. It is safe not waiting for the replay. First, the driver doesn't do anything with the replay second the connection is closed immediately, hence the packet will be just safely discarded in case it is received and last the driver won't get stuck if the firmware won't reply. Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman

mei: fix deadlock on mei reset

2017-03-30T07:44:06+00:00

commit a733ded50b6ea846200073e7381a302df71e13b3 upstream. This patch fixes 'mei: synchronize irq before initiating a reset' The patch had introduced a deadlock between irq thread and mei_reset() as they are both holding the same device lock. ---> device_lock: mei_reset() <---- interrupt thread device_lock ---> synchornize_irq() wait on interrupt thread == (dead lock) The fix is to call synchronize_irq prior to call locked mei_reset function. Fixes: f302bb0de6ac (mei: synchronize irq before initiating a reset) Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman

mei: remove support for broken parallel read

2017-03-12T05:44:13+00:00

commit cb97fbbcac15982406e0c74cd5512a8b6fcf10b3 upstream. Parallel reads from multiple threads on a file descriptor are not well defined and racy. It is safer to return to original behavior and simply fail the additional read. The solution is to remove request for next read credit. Fixes: ff1586a7ea57 ("mei: enqueue consecutive reads") Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman

mei: bus: enable OS version only for SPT and newer

2017-01-11T06:43:57+00:00

Sending OS version for support of TPM2_ChangeEPS() is required only for SPT FW (HMB version 2.0) and newer. On older platforms the command should be just ignored by the firmware but some older platforms misbehave so it's safer to send the command only if required. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=192051 Fixes: 7279b238bade (mei: send OS type to the FW) Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler Tested-by: Jan Niehusmann Signed-off-by: Greg Kroah-Hartman

mei: move write cb to completion on credentials failures

2017-01-04T17:22:44+00:00

The credentials handling was pushed to the write handlers but error handling wasn't done properly. Move write callbacks to completion queue to destroy them and to notify a blocked writer about the failure Fixes: 136698e535cd1 (mei: push credentials inside the irq write handler) Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman

mei: bus: fix mei_cldev_enable KDoc

2017-01-04T17:22:43+00:00

Adjust function name in KDoc. Fixes: d49dc5e76fc9 (mei: bus: use mei_cldev_ prefix for the API functions) Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman

mei: bus: enable non-blocking RX

2016-12-06T10:05:46+00:00

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

mei: fix the back to back interrupt handling

2016-12-06T10:03:22+00:00

Since the newer HW sports two interrupts causes we cannot just simply acknowledge the interrupts directly in the quick handler and store the cause in the member variable, as the cause will be overridden upon next interrupt while the interrupt thread was not yet scheduled handling the previous interrupt. The simple fix is to disable interrupts in quick handler and acknowledge and enabled them in the interrupt thread. Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman

mei: synchronize irq before initiating a reset.

2016-12-06T10:03:22+00:00

We need to synchronize irqs before issuing reset to make sure that the clients communication is concluded and doesn't leak to the reset flow and confusing the state machine. This issue is happening during suspend/resume stress testing. Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman

mei: me: add lewisburg device ids

2016-11-29T19:15:30+00:00

Add MEI Lewisburg PCH IDs for Purley based workstations. Cc: # 4.8.x Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman