Please backport b86f86e8e7c5 ("serial: 8250: fix potential deadlock in rs485-mode")

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Subject: Please backport b86f86e8e7c5 ("serial: 8250: fix potential deadlock in rs485-mode")
From: Richard Weinberger <richard@xxxxxx>
Date: Wed, 19 May 2021 21:20:34 +0200 (CEST)
Cc: tomas.melin@xxxxxxxxxxx, gregkh@xxxxxxxxxxxxxxxxxxx, linux-serial@xxxxxxxxxxxxxxx
Thread-index: hqBNF9KYvvk63RA2cmny2kdaKWQidg==
Thread-topic: Please backport b86f86e8e7c5 ("serial: 8250: fix potential deadlock in rs485-mode")

Hi!

Please backport commit b86f86e8e7c5 ("serial: 8250: fix potential deadlock in rs485-mode") to stable.
The issue is real, I was hit by it on 4.14.

Thanks,
//richard

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