mei: limit the number of consecutive resets
give up reseting after 3 unsuccessful tries
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/misc/mei/init.c b/drivers/misc/mei/init.c
index 059133d..cdd31c2 100644
--- a/drivers/misc/mei/init.c
+++ b/drivers/misc/mei/init.c
@@ -89,6 +89,13 @@
interrupts_enabled = state != MEI_DEV_POWER_DOWN;
dev->dev_state = MEI_DEV_RESETTING;
+ dev->reset_count++;
+ if (dev->reset_count > MEI_MAX_CONSEC_RESET) {
+ dev_err(&dev->pdev->dev, "reset: reached maximal consecutive resets: disabling the device\n");
+ dev->dev_state = MEI_DEV_DISABLED;
+ return -ENODEV;
+ }
+
ret = mei_hw_reset(dev, interrupts_enabled);
/* fall through and remove the sw state even if hw reset has failed */
@@ -169,6 +176,7 @@
dev_dbg(&dev->pdev->dev, "reset in start the mei device.\n");
dev->dev_state = MEI_DEV_INITIALIZING;
+ dev->reset_count = 0;
mei_reset(dev);
if (dev->dev_state == MEI_DEV_DISABLED) {
@@ -224,6 +232,7 @@
mei_clear_interrupts(dev);
dev->dev_state = MEI_DEV_POWER_UP;
+ dev->reset_count = 0;
err = mei_reset(dev);
@@ -285,6 +294,7 @@
init_waitqueue_head(&dev->wait_recvd_msg);
init_waitqueue_head(&dev->wait_stop_wd);
dev->dev_state = MEI_DEV_INITIALIZING;
+ dev->reset_count = 0;
mei_io_list_init(&dev->read_list);
mei_io_list_init(&dev->write_list);