linux-kernel - Re: [PATCH] HID: debug: fix the ring buffer implementation

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Message-ID: <1280032330.67094297.1548517481057.JavaMail.zimbra@redhat.com>
Date:   Sat, 26 Jan 2019 10:44:41 -0500 (EST)
From:   Vladis Dronov <vdronov@...hat.com>
To:     Oleg Nesterov <oleg@...hat.com>, Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH] HID: debug: fix the ring buffer implementation

Hello, Oleg, all,

Thanks much, Oleg, these are really valuable additions:

> suspicious ;) if you add a comment the patch will be even better.

Great, will do.

> perhaps it make sense to move this check into the "if (kfifo_is_empty())"
> block.

Indeed, otherwise it kinda breaks the execution logic.

> is kfifo_is_empty() == T really possible here?

It looks like it is not. Reads are guarded by read_mutex and the only other
code which touches hid_debug_fifo is writer.

I will post v2 here soon. Lets see if it is ready for inclusion.

Best regards,
Vladis Dronov | Red Hat, Inc. | Product Security | Senior Software Engineer