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mei: discard replies from unconnected fixed address clients 

A fixed address client in the FW doesn't have a notion of connection and
can send message after the file associated with it was already closed.
Silently discard such messages.
Add inline helpers to detect whether a message is hbm or intended for
a fixed address client

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>
This commit is contained in:
Alexander Usyskin 2016-02-07 23:35:36 +02:00 committed by Greg Kroah-Hartman
parent a4307fe45a
commit 603c53e42a
1 changed files with 19 additions and 1 deletions
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20
drivers/misc/mei/interrupt.c
View File

@ -239,6 +239,16 @@ static int mei_cl_irq_read(struct mei_cl *cl, struct mei_cl_cb *cb,
return 0;
}
static inline bool hdr_is_hbm(struct mei_msg_hdr *mei_hdr)
{
return mei_hdr->host_addr == 0 && mei_hdr->me_addr == 0;
}
static inline bool hdr_is_fixed(struct mei_msg_hdr *mei_hdr)
{
return mei_hdr->host_addr == 0 && mei_hdr->me_addr != 0;
}
/**
* mei_irq_read_handler - bottom half read routine after ISR to
* handle the read processing.
@ -280,7 +290,7 @@ int mei_irq_read_handler(struct mei_device *dev,
}
/* HBM message */
if (mei_hdr->host_addr == 0 && mei_hdr->me_addr == 0) {
if (hdr_is_hbm(mei_hdr)) {
ret = mei_hbm_dispatch(dev, mei_hdr);
if (ret) {
dev_dbg(dev->dev, "mei_hbm_dispatch failed ret = %d\n",
@ -300,6 +310,14 @@ int mei_irq_read_handler(struct mei_device *dev,
/* if no recipient cl was found we assume corrupted header */
if (&cl->link == &dev->file_list) {
/* A message for not connected fixed address clients
* should be silently discarded
*/
if (hdr_is_fixed(mei_hdr)) {
mei_irq_discard_msg(dev, mei_hdr);
ret = 0;
goto reset_slots;
}
dev_err(dev->dev, "no destination client found 0x%08X\n",
dev->rd_msg_hdr);
ret = -EBADMSG;