From: Alexander Usyskin Date: Sun, 17 Apr 2016 16:16:04 +0000 (-0400) Subject: mei: amthif: discard not read messages X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=9d04ee11db7bf0d848266cbfd7db336097a0e239;p=linux.git mei: amthif: discard not read messages 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 --- diff --git a/drivers/misc/mei/amthif.c b/drivers/misc/mei/amthif.c index 194360a5f7823..a039a5df6f214 100644 --- a/drivers/misc/mei/amthif.c +++ b/drivers/misc/mei/amthif.c @@ -380,8 +380,10 @@ int mei_amthif_irq_read_msg(struct mei_cl *cl, 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) diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c index 704dc6caad6d7..3831a7ba2531c 100644 --- a/drivers/misc/mei/interrupt.c +++ b/drivers/misc/mei/interrupt.c @@ -76,7 +76,6 @@ static inline int mei_cl_hbm_equal(struct mei_cl *cl, * @dev: mei device * @hdr: message header */ -static inline void mei_irq_discard_msg(struct mei_device *dev, struct mei_msg_hdr *hdr) { /* diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h index 87586bbc4a411..c9e01021eadf4 100644 --- a/drivers/misc/mei/mei_dev.h +++ b/drivers/misc/mei/mei_dev.h @@ -702,6 +702,8 @@ bool mei_hbuf_acquire(struct mei_device *dev); 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);