linux-kernel - Re: [PATCH] staging: r8188eu: Use a Mutex instead of a binary Semaphore

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Date:   Sat, 23 Oct 2021 16:02:16 +0200
From:   "Fabio M. De Francesco" <fmdefrancesco@...il.com>
To:     Phillip Potter <phil@...lpotter.co.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Larry Finger <Larry.Finger@...inger.net>
Subject: Re: [PATCH] staging: r8188eu: Use a Mutex instead of a binary Semaphore

On Friday, October 22, 2021 7:52:33 PM CEST Larry Finger wrote:
> On 10/22/21 12:19, Fabio M. De Francesco wrote:
> > Use a Mutex instead of a binary Semaphore for the purpose of enforcing
> > mutual exclusive access to the "pwrctrl_priv" structure.
> > 
> > Mutexes are sleeping locks similar to Semaphores with a 'count' of one
> > (like binary Semaphores), however they have a simpler interface, more
> > efficient performance, and additional constraints.
> > 
> > There is no change in the logic of the new code; however it is more
> > simple because it gets rid of four unnecessary wrappers:
> > _init_pwrlock(), _enter_pwrlock(),_exit_pwrlock(), _rtw_down_sema().
> > 
> > Actually, there is a change in the state in which the code waits for
> > acquiring locks, because it makes it in an uninterruptible state
> > (instead the old code used down_interruptible()). Interruptible
> > waits are neither required nor wanted in this driver.
> > 
> > Tested with ASUSTek Computer, Inc. Realtek 8188EUS [USB-N10 Nano].
> > 
> > Signed-off-by: Fabio M. De Francesco <fmdefrancesco@...il.com>
> 
> Well done.
> 
> Acked-by: Larry Finger <Larry.Finger@...inger.net>
> 
Hi Larry, 

Thank you very much for giving your "Acked-by" tag, and, above all, for the 
"Well done".

Best regards,

Fabio