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usb: dwc3: fix runtime PM in error path 

If there is a failure after pm_runtime_enable/get_sync()
we need to call pm_runtime_disable/put_sync().

Otherwise it will lead to an unbalanced pm_runtime_enable() on the
subsequent probe if the earlier probe bailed out due to -EPROBE_DEFER.

pm_runtime_get_sync() can fail as well so deal with that case too.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Roger Quadros 2016-06-10 14:38:02 +03:00 committed by Felipe Balbi
parent b6d4e16e83
commit 328082376a
1 changed files with 18 additions and 8 deletions
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26
drivers/usb/dwc3/core.c
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@ -965,14 +965,17 @@ static int dwc3_probe(struct platform_device *pdev)
pm_runtime_use_autosuspend(dev);
pm_runtime_set_autosuspend_delay(dev, DWC3_DEFAULT_AUTOSUSPEND_DELAY);
pm_runtime_enable(dev);
pm_runtime_get_sync(dev);
ret = pm_runtime_get_sync(dev);
if (ret < 0)
goto err1;
pm_runtime_forbid(dev);
ret = dwc3_alloc_event_buffers(dwc, DWC3_EVENT_BUFFERS_SIZE);
if (ret) {
dev_err(dwc->dev, "failed to allocate event buffers\n");
ret = -ENOMEM;
goto err0;
goto err2;
}
if (IS_ENABLED(CONFIG_USB_DWC3_HOST) &&
@ -989,12 +992,12 @@ static int dwc3_probe(struct platform_device *pdev)
ret = dwc3_alloc_scratch_buffers(dwc);
if (ret)
goto err1;
goto err3;
ret = dwc3_core_init(dwc);
if (ret) {
dev_err(dev, "failed to initialize core\n");
goto err2;
goto err4;
}
/* Check the maximum_speed parameter */
@ -1026,23 +1029,30 @@ static int dwc3_probe(struct platform_device *pdev)
ret = dwc3_core_init_mode(dwc);
if (ret)
goto err3;
goto err5;
dwc3_debugfs_init(dwc);
pm_runtime_put(dev);
return 0;
err3:
err5:
dwc3_event_buffers_cleanup(dwc);
err2:
err4:
dwc3_free_scratch_buffers(dwc);
err1:
err3:
dwc3_free_event_buffers(dwc);
dwc3_ulpi_exit(dwc);
err2:
pm_runtime_allow(&pdev->dev);
err1:
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
err0:
/*
* restore res->start back to its original value so that, in case the