serial: 8250: omap: Don't skip resource freeing if pm_runtime_resume_and_get() failed

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: serial: 8250: omap: Don't skip resource freeing if pm_runtime_resume_and_get() failed Returning an error code from .remove() makes the driver core emit the little helpful error message: remove callback returned a non-zero value. This will be ignored. and then remove the device anyhow. So all resources that were not freed are leaked in this case. Skipping serial8250_unregister_port() has the potential to keep enough of the UART around to trigger a use-after-free. So replace the error return (and with it the little helpful error message) by a more useful error message and continue to cleanup.

References

• https://git.kernel.org/stable/c/b502fb43f7fb55aaf07f6092ab44657595214b93
• https://git.kernel.org/stable/c/bc57f3ef8a9eb0180606696f586a6dcfaa175ed0
• https://git.kernel.org/stable/c/828cd829483f0cda920710997aed79130b0af690
• https://git.kernel.org/stable/c/d74173bda29aba58f822175d983d07c8ed335494
• https://git.kernel.org/stable/c/887a558d0298d36297daea039954c39940228d9b
• https://git.kernel.org/stable/c/95e4e0031effad9837af557ecbfd4294a4d8aeee
• https://git.kernel.org/stable/c/ad90d0358bd3b4554f243a425168fc7cebe7d04e