Coverity: cdns3_gadget_start(): Error handling issues

Hello!

This is an experimental semi-automated report about issues detected by Coverity from a scan of next-20210408 as part of the linux-next scan project:
https://scan.coverity.com/projects/linux-next-weekly-scan

You're getting this email because you were associated with the identified lines of code (noted below) that were touched by commits:

Thu Aug 29 10:57:04 2019 +0300

    7733f6c32e36 ("usb: cdns3: Add Cadence USB3 DRD Driver")

Coverity reported the following:

*** CID 1503690: Error handling issues (CHECKED_RETURN) /drivers/usb/cdns3/cdns3-gadget.c: 3143 in cdns3_gadget_start()

3137     			cdns3_gadget_release);
3138     	cdns->gadget_dev = priv_dev;
3139     	priv_dev->sysdev = cdns->dev;
3140     	priv_dev->dev = cdns->dev;
3141     	priv_dev->regs = cdns->dev_regs;

3142
vvv CID 1503690: Error handling issues (CHECKED_RETURN)
vvv Calling "device_property_read_u16" without checking return value (as is done elsewhere 4 out of 5 times).
3143 device_property_read_u16(priv_dev->dev, "cdns,on-chip-buff-size",
3144 &priv_dev->onchip_buffers);
3145
3146 if (priv_dev->onchip_buffers <= 0) {
3147 u32 reg = readl(&priv_dev->regs->usb_cap2);
3148

If this is a false positive, please let us know so we can mark it as such, or teach the Coverity rules to be smarter. If not, please make sure fixes get into linux-next. :) For patches fixing this, please include these lines (but double-check the "Fixes" first):

Addresses-Coverity-ID: 1503690 ("Error handling issues")

Thanks for your attention!

Coverity-bot