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uru4000: fix race condition on waiting power up irq

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It can come before we finish reading the status register on some
cases. Arm the irq handler early, and fix the state machine to
handle early irq properly.

https://bugs.freedesktop.org/show_bug.cgi?id=57834
This commit is contained in:
Timo Teräs 2012-12-04 10:50:30 +02:00 committed by Bastien Nocera
parent a5ec0b30e1
commit 7e1646c382
1 changed files with 20 additions and 11 deletions
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27
libfprint/drivers/uru4000.c
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@ -994,17 +994,20 @@ static void init_scanpwr_irq_cb(struct fp_img_dev *dev, int status,
uint16_t type, void *user_data)
{
struct fpi_ssm *ssm = user_data;
struct uru4k_dev *urudev = dev->priv;
if (status)
fpi_ssm_mark_aborted(ssm, status);
else if (type != IRQDATA_SCANPWR_ON)
fp_dbg("ignoring interrupt");
else if (ssm->cur_state != INIT_AWAIT_SCAN_POWER)
fp_err("ignoring scanpwr interrupt due to being in wrong state %d",
ssm->cur_state);
else
else if (ssm->cur_state != INIT_AWAIT_SCAN_POWER) {
fp_dbg("early scanpwr interrupt");
urudev->scanpwr_irq_timeouts = -1;
} else {
fp_dbg("late scanpwr interrupt");
fpi_ssm_next_state(ssm);
}
}
static void init_scanpwr_timeout(void *user_data)
{
@ -1053,14 +1056,21 @@ static void init_run_state(struct fpi_ssm *ssm)
fpi_ssm_next_state(ssm);
break;
case INIT_POWERUP: ;
if (!IRQ_HANDLER_IS_RUNNING(urudev)) {
fpi_ssm_mark_aborted(ssm, -EIO);
break;
}
urudev->irq_cb_data = ssm;
urudev->irq_cb = init_scanpwr_irq_cb;
struct fpi_ssm *powerupsm = fpi_ssm_new(dev->dev, powerup_run_state,
POWERUP_NUM_STATES);
powerupsm->priv = dev;
fpi_ssm_start_subsm(ssm, powerupsm);
break;
case INIT_AWAIT_SCAN_POWER:
if (!IRQ_HANDLER_IS_RUNNING(urudev)) {
fpi_ssm_mark_aborted(ssm, -EIO);
if (urudev->scanpwr_irq_timeouts < 0) {
fpi_ssm_next_state(ssm);
break;
}
@ -1073,13 +1083,12 @@ static void init_run_state(struct fpi_ssm *ssm)
fpi_ssm_mark_aborted(ssm, -ETIME);
break;
}
urudev->irq_cb_data = ssm;
urudev->irq_cb = init_scanpwr_irq_cb;
break;
case INIT_DONE:
if (urudev->scanpwr_irq_timeout) {
fpi_timeout_cancel(urudev->scanpwr_irq_timeout);
urudev->scanpwr_irq_timeout = NULL;
}
urudev->irq_cb_data = NULL;
urudev->irq_cb = NULL;
fpi_ssm_next_state(ssm);