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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>
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@ -380,8 +380,10 @@ int mei_amthif_irq_read_msg(struct mei_cl *cl,
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dev = cl->dev;
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if (dev->iamthif_state != MEI_IAMTHIF_READING)
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if (dev->iamthif_state != MEI_IAMTHIF_READING) {
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mei_irq_discard_msg(dev, mei_hdr);
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return 0;
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}
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ret = mei_cl_irq_read_msg(cl, mei_hdr, cmpl_list);
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if (ret)
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@ -76,7 +76,6 @@ static inline int mei_cl_hbm_equal(struct mei_cl *cl,
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* @dev: mei device
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* @hdr: message header
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*/
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static inline
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void mei_irq_discard_msg(struct mei_device *dev, struct mei_msg_hdr *hdr)
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{
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/*
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@ -702,6 +702,8 @@ bool mei_hbuf_acquire(struct mei_device *dev);
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bool mei_write_is_idle(struct mei_device *dev);
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void mei_irq_discard_msg(struct mei_device *dev, struct mei_msg_hdr *hdr);
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#if IS_ENABLED(CONFIG_DEBUG_FS)
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int mei_dbgfs_register(struct mei_device *dev, const char *name);
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void mei_dbgfs_deregister(struct mei_device *dev);
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