misc: mei: fix stalled read
This bug caused severe connectivity issue in the LMS application
(LMS is described in Documentation/misc-devices/mei/mei.txt)
The bug was introduced in patch:
commit 1ccb7b6249f9bc50678e2a383084ed0a34cc9239
staging/mei: propagate error codes up in the write flow
The patch has reverted the return value logic of some fo function but
the conditional in _mei_irq_thread_read function was not swapped
making read always entering the error path
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c
index 93936f1..23f5463 100644
--- a/drivers/misc/mei/interrupt.c
+++ b/drivers/misc/mei/interrupt.c
@@ -835,7 +835,7 @@
struct mei_cl *cl,
struct mei_io_list *cmpl_list)
{
- if ((*slots * sizeof(u32)) >= (sizeof(struct mei_msg_hdr) +
+ if ((*slots * sizeof(u32)) < (sizeof(struct mei_msg_hdr) +
sizeof(struct hbm_flow_control))) {
/* return the cancel routine */
list_del(&cb_pos->cb_list);