From: Tomas Winkler <tomas.winkler@intel.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Alexander Usyskin <alexander.usyskin@intel.com>,
linux-kernel@vger.kernel.org,
Tomas Winkler <tomas.winkler@intel.com>
Subject: [char-misc-next 20/27] mei: discard replies from unconnected fixed address clients
Date: Sun, 7 Feb 2016 23:35:36 +0200 [thread overview]
Message-ID: <1454880943-12653-21-git-send-email-tomas.winkler@intel.com> (raw)
In-Reply-To: <1454880943-12653-1-git-send-email-tomas.winkler@intel.com>
From: Alexander Usyskin <alexander.usyskin@intel.com>
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>
---
drivers/misc/mei/interrupt.c | 20 +++++++++++++++++++-
1 file changed, 19 insertions(+), 1 deletion(-)
diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c
index 72806ef6efdd..06b744a503a3 100644
--- a/drivers/misc/mei/interrupt.c
+++ b/drivers/misc/mei/interrupt.c
@@ -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;
--
2.4.3
next prev parent reply other threads:[~2016-02-07 21:40 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-07 21:35 [char-misc-next 00/27] mei: fixes, improvements, and cleanups Tomas Winkler
2016-02-07 21:35 ` [char-misc-next 01/27] mei: debugfs: adjust active clients print buffer Tomas Winkler
2016-02-07 21:35 ` [char-misc-next 02/27] mei: debugfs: allow hbm features list dump in earlier stages Tomas Winkler
2016-02-07 21:35 ` [char-misc-next 03/27] mei: fix possible integer overflow issue Tomas Winkler
2016-02-07 21:35 ` [char-misc-next 04/27] mei: call stop on failed char device register Tomas Winkler
2016-02-07 21:35 ` [char-misc-next 05/27] mei: amthif: don't copy from an empty buffer Tomas Winkler
2016-02-07 21:35 ` [char-misc-next 06/27] mei: amthif: don't drop read packets on timeout Tomas Winkler
2016-02-07 21:35 ` [char-misc-next 07/27] mei: constify struct file pointer Tomas Winkler
2016-02-07 21:35 ` [char-misc-next 08/27] mei: rename variable names 'file_object' to fp Tomas Winkler
2016-02-07 21:35 ` [char-misc-next 09/27] mei: amthif: allow only one request at a time Tomas Winkler
2016-02-07 21:35 ` [char-misc-next 10/27] mei: amthif: replace amthif_rd_complete_list with rd_completed Tomas Winkler
2016-02-07 21:35 ` [char-misc-next 11/27] mei: amthif: drop parameter validation from mei_amthif_write Tomas Winkler
2016-02-07 21:35 ` [char-misc-next 12/27] mei: amthif: use rx_wait queue also for amthif client Tomas Winkler
2016-02-07 21:35 ` [char-misc-next 13/27] mei: amthif: interrupt reader on link reset Tomas Winkler
2016-02-07 21:35 ` [char-misc-next 14/27] mei: bus: fix RX event scheduling Tomas Winkler
2016-02-07 21:35 ` [char-misc-next 15/27] mei: bus: fix notification event delivery Tomas Winkler
2016-02-07 21:35 ` [char-misc-next 16/27] mei: bus: check if the device is enabled before data transfer Tomas Winkler
2016-02-07 21:35 ` [char-misc-next 17/27] mei: drop superfluous closing bracket from write traces Tomas Winkler
2016-02-07 21:35 ` [char-misc-next 18/27] mei: wake blocked write on link reset Tomas Winkler
2016-02-07 21:35 ` [char-misc-next 19/27] mei: clean write queues and wake waiters on disconnect Tomas Winkler
2016-02-07 21:35 ` Tomas Winkler [this message]
2016-02-07 21:35 ` [char-misc-next 21/27] mei: fill file pointer in read cb for fixed address client Tomas Winkler
2016-02-07 21:35 ` [char-misc-next 22/27] mei: fixed address clients for the new platforms Tomas Winkler
2016-02-07 21:35 ` [char-misc-next 23/27] mei: hbm: warn about fw-initiated disconnect Tomas Winkler
2016-02-07 21:35 ` [char-misc-next 24/27] mei: drop reserved host client ids Tomas Winkler
2016-02-07 21:35 ` [char-misc-next 25/27] mei: bus: run rescan on me_clients list change Tomas Winkler
2016-02-07 21:35 ` [char-misc-next 26/27] mei: hbm: send immediate reply flag in enum request Tomas Winkler
2016-02-07 21:35 ` [char-misc-next 27/27] mei: split amthif client init from end of clients enumeration Tomas Winkler
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