This is a note to let you know that I've just added the patch titled mei: amthif: discard not read messages to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: mei-amthif-discard-not-read-messages.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 9d04ee11db7bf0d848266cbfd7db336097a0e239 Mon Sep 17 00:00:00 2001 From: Alexander Usyskin <alexander.usyskin@xxxxxxxxx> Date: Sun, 17 Apr 2016 12:16:04 -0400 Subject: mei: amthif: discard not read messages From: Alexander Usyskin <alexander.usyskin@xxxxxxxxx> commit 9d04ee11db7bf0d848266cbfd7db336097a0e239 upstream. 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. Signed-off-by: Alexander Usyskin <alexander.usyskin@xxxxxxxxx> Signed-off-by: Tomas Winkler <tomas.winkler@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/misc/mei/amthif.c | 4 +++- drivers/misc/mei/interrupt.c | 1 - drivers/misc/mei/mei_dev.h | 2 ++ 3 files changed, 5 insertions(+), 2 deletions(-) --- a/drivers/misc/mei/amthif.c +++ b/drivers/misc/mei/amthif.c @@ -417,8 +417,10 @@ int mei_amthif_irq_read_msg(struct mei_c dev = cl->dev; - if (dev->iamthif_state != MEI_IAMTHIF_READING) + if (dev->iamthif_state != MEI_IAMTHIF_READING) { + mei_irq_discard_msg(dev, mei_hdr); return 0; + } ret = mei_cl_irq_read_msg(cl, mei_hdr, cmpl_list); if (ret) --- a/drivers/misc/mei/interrupt.c +++ b/drivers/misc/mei/interrupt.c @@ -76,7 +76,6 @@ static inline int mei_cl_hbm_equal(struc * @dev: mei device * @hdr: message header */ -static inline void mei_irq_discard_msg(struct mei_device *dev, struct mei_msg_hdr *hdr) { /* --- a/drivers/misc/mei/mei_dev.h +++ b/drivers/misc/mei/mei_dev.h @@ -782,6 +782,8 @@ bool mei_hbuf_acquire(struct mei_device bool mei_write_is_idle(struct mei_device *dev); +void mei_irq_discard_msg(struct mei_device *dev, struct mei_msg_hdr *hdr); + #if IS_ENABLED(CONFIG_DEBUG_FS) int mei_dbgfs_register(struct mei_device *dev, const char *name); void mei_dbgfs_deregister(struct mei_device *dev); Patches currently in stable-queue which might be from alexander.usyskin@xxxxxxxxx are queue-4.4/mei-fix-null-dereferencing-during-fw-initiated-disconnection.patch queue-4.4/mei-amthif-discard-not-read-messages.patch queue-4.4/mei-bus-call-mei_cl_read_start-under-device-lock.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html