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mei: don't get stuck in select during reset

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Clear pending connection after hw reset but before hw start
and wake up the waiting task in poll. Signal POLLERR in select
when device went through reset.

Add wrapper mei_cl_is_connected for checking if
the device and client are connected.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tomas Winkler 2013-07-25 20:15:53 +03:00 committed by Greg Kroah-Hartman
parent 20138d6cb8
commit b950ac1dab
5 changed files with 42 additions and 19 deletions
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14
drivers/misc/mei/amthif.c
View File

@ -418,15 +418,23 @@ unsigned int mei_amthif_poll(struct mei_device *dev,
struct file *file, poll_table *wait)
{
unsigned int mask = 0;
mutex_unlock(&dev->device_lock);
poll_wait(file, &dev->iamthif_cl.wait, wait);
mutex_lock(&dev->device_lock);
if (dev->iamthif_state == MEI_IAMTHIF_READ_COMPLETE &&
dev->iamthif_file_object == file) {
if (!mei_cl_is_connected(&dev->iamthif_cl)) {
mask = POLLERR;
} else if (dev->iamthif_state == MEI_IAMTHIF_READ_COMPLETE &&
dev->iamthif_file_object == file) {
mask |= (POLLIN | POLLRDNORM);
dev_dbg(&dev->pdev->dev, "run next amthif cb\n");
mei_amthif_run_next_cmd(dev);
}
mutex_unlock(&dev->device_lock);
return mask;
}

5
drivers/misc/mei/client.c
View File

@ -635,10 +635,7 @@ int mei_cl_read_start(struct mei_cl *cl, size_t length)
dev = cl->dev;
if (cl->state != MEI_FILE_CONNECTED)
return -ENODEV;
if (dev->dev_state != MEI_DEV_ENABLED)
if (!mei_cl_is_connected(cl))
return -ENODEV;
if (cl->read_cb) {

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

@ -84,6 +84,13 @@ int mei_cl_flow_ctrl_reduce(struct mei_cl *cl);
/*
* MEI input output function prototype
*/
static inline bool mei_cl_is_connected(struct mei_cl *cl)
{
return (cl->dev &&
cl->dev->dev_state == MEI_DEV_ENABLED &&
cl->state == MEI_FILE_CONNECTED);
}
bool mei_cl_is_other_connecting(struct mei_cl *cl);
int mei_cl_disconnect(struct mei_cl *cl);
int mei_cl_connect(struct mei_cl *cl, struct file *file);

13
drivers/misc/mei/init.c
View File

@ -149,12 +149,20 @@ void mei_reset(struct mei_device *dev, int interrupts_enabled)
dev->hbm_state = MEI_HBM_IDLE;
if (dev->dev_state != MEI_DEV_INITIALIZING) {
if (dev->dev_state != MEI_DEV_DISABLED &&
dev->dev_state != MEI_DEV_POWER_DOWN)
dev->dev_state = MEI_DEV_RESETTING;
/* remove all waiting requests */
mei_cl_all_write_clear(dev);
mei_cl_all_disconnect(dev);
/* wake up all readings so they can be interrupted */
mei_cl_all_wakeup(dev);
/* remove entry if already in list */
dev_dbg(&dev->pdev->dev, "remove iamthif and wd from the file list.\n");
mei_cl_unlink(&dev->wd_cl);
@ -195,11 +203,6 @@ void mei_reset(struct mei_device *dev, int interrupts_enabled)
mei_hbm_start_req(dev);
/* wake up all readings so they can be interrupted */
mei_cl_all_wakeup(dev);
/* remove all waiting requests */
mei_cl_all_write_clear(dev);
}
EXPORT_SYMBOL_GPL(mei_reset);

22
drivers/misc/mei/main.c
View File

@ -625,24 +625,32 @@ static unsigned int mei_poll(struct file *file, poll_table *wait)
unsigned int mask = 0;
if (WARN_ON(!cl || !cl->dev))
return mask;
return POLLERR;
dev = cl->dev;
mutex_lock(&dev->device_lock);
if (dev->dev_state != MEI_DEV_ENABLED)
goto out;
if (cl == &dev->iamthif_cl) {
mask = mei_amthif_poll(dev, file, wait);
if (!mei_cl_is_connected(cl)) {
mask = POLLERR;
goto out;
}
mutex_unlock(&dev->device_lock);
if (cl == &dev->iamthif_cl)
return mei_amthif_poll(dev, file, wait);
poll_wait(file, &cl->tx_wait, wait);
mutex_lock(&dev->device_lock);
if (!mei_cl_is_connected(cl)) {
mask = POLLERR;
goto out;
}
if (MEI_WRITE_COMPLETE == cl->writing_state)
mask |= (POLLIN | POLLRDNORM);