linux-kernel - Re: [PATCH] staging: pi433: add descriptions for mutex locks

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Message-ID: <20180323114254.GL31333@gavran.carpriv.carnet.hr>
Date:   Fri, 23 Mar 2018 12:42:54 +0100
From:   Valentin Vidic <Valentin.Vidic@...Net.hr>
To:     Marcus Wolf <marcus.wolf@...rthome-wolf.de>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Simon Sandström <simon@...anor.nu>,
        Marcus Wolf <linux@...f-Entwicklungen.de>,
        Luca Söthe <luca@...l.me>,
        Marcin Ciupak <marcin.s.ciupak@...il.com>,
        Michael Panzlaff <michael.panzlaff@....de>,
        Derek Robson <robsonde@...il.com>, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: pi433: add descriptions for mutex locks

On Fri, Mar 23, 2018 at 11:22:39AM +0100, Marcus Wolf wrote:
> could you please decribe in short words, why you think, that hte lock
> isn't obsolete?
> 
> I wasn't sure, but close to remove the lock. That's why I putted the
> comment.

Sure, if pi433_tx_thread runs on one CPU it might be possible
to call pi433_write concurrently on another CPU and they would
both modify tx_fifo.  But maybe there is some other protection
in place that would prevent this?

-- 
Valentin