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authorAlexander Usyskin <alexander.usyskin@intel.com>2016-04-17 12:16:04 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-04-30 14:08:08 -0700
commit9d04ee11db7bf0d848266cbfd7db336097a0e239 (patch)
tree560ac736e47c93b2cc1273a76c45ec3c70fe6d87 /drivers/misc
parent6a8d648c8d1824117a9e9edb948ed1611fb013c0 (diff)
downloadop-kernel-dev-9d04ee11db7bf0d848266cbfd7db336097a0e239.zip
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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: <stable@vger.kernel.org> #4.2+ Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/mei/amthif.c4
-rw-r--r--drivers/misc/mei/interrupt.c1
-rw-r--r--drivers/misc/mei/mei_dev.h2
3 files changed, 5 insertions, 2 deletions
diff --git a/drivers/misc/mei/amthif.c b/drivers/misc/mei/amthif.c
index 194360a..a039a5d 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 704dc6c..3831a7b 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 87586bb..c9e0102 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);
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