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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>
This commit is contained in:
Tomas Winkler 2014-01-12 00:36:10 +02:00 committed by Greg Kroah-Hartman
parent 33ec082631
commit 6adb8efb02
3 changed files with 18 additions and 0 deletions
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1
drivers/misc/mei/client.c
View File

@ -370,6 +370,7 @@ void mei_host_client_init(struct work_struct *work)
}
dev->dev_state = MEI_DEV_ENABLED;
dev->reset_count = 0;
mutex_unlock(&dev->device_lock);
}

10
drivers/misc/mei/init.c
View File

@ -89,6 +89,13 @@ int mei_reset(struct mei_device *dev)
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 @@ int mei_start(struct mei_device *dev)
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 @@ int mei_restart(struct mei_device *dev)
mei_clear_interrupts(dev);
dev->dev_state = MEI_DEV_POWER_UP;
dev->reset_count = 0;
err = mei_reset(dev);
@ -285,6 +294,7 @@ void mei_device_init(struct mei_device *dev)
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);

7
drivers/misc/mei/mei_dev.h
View File

@ -60,6 +60,11 @@ extern const uuid_le mei_wd_guid;
*/
#define MEI_CLIENTS_MAX 256
/*
* maximum number of consecutive resets
*/
#define MEI_MAX_CONSEC_RESET 3
/*
* Number of File descriptors/handles
* that can be opened to the driver.
@ -327,6 +332,7 @@ struct mei_cl_device {
/**
* struct mei_device - MEI private device struct
* @reset_count - limits the number of consecutive resets
* @hbm_state - state of host bus message protocol
* @mem_addr - mem mapped base register address
@ -370,6 +376,7 @@ struct mei_device {
/*
* mei device states
*/
unsigned long reset_count;
enum mei_dev_state dev_state;
enum mei_hbm_state hbm_state;
u16 init_clients_timer;