netdev - Re: [EXT] Re: [PATCH NET] net: atlantic: Use readx_poll

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Message-ID: <1eea92e3-872f-2e83-f97c-4c57cd5d72b2@marvell.com>
Date:   Thu, 20 Aug 2020 13:17:48 +0300
From:   Igor Russkikh <irusskikh@...vell.com>
To:     Guenter Roeck <linux@...ck-us.net>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
CC:     <netdev@...r.kernel.org>, Jakub Kicinski <kuba@...nel.org>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        Dmitry Bogdanov <dbogdanov@...vell.com>
Subject: Re: [EXT] Re: [PATCH NET] net: atlantic: Use readx_poll_timeout() for
 large timeout


>> implemented a read callback with an udelay(10000U). This fails to
>> compile on ARM because the delay is >1ms. I doubt that it is needed to
>> spin for 10ms even if possible on x86.
>>
>> >From looking at the code, the context appears to be preemptible so
> using
>> usleep() should work and avoid busy spinning.
>>
>> Use readx_poll_timeout() in the poll loop.
>>
>> Cc: Mark Starovoytov <mstarovoitov@...vell.com>
>> Cc: Igor Russkikh <irusskikh@...vell.com>
>> Signed-off-by: Sebastian Andrzej Siewior <sebastian@...akpoint.cc>
> 
> Fixes: 8dcf2ad39fdb2 ("net: atlantic: add hwmon getter for MAC
> temperature")
> Acked-by: Guenter Roeck <linux@...ck-us.net>
> 
> As in: This patch does not cause any additional trouble and will fix the
> observed compile failure. However, the submitter of 8dcf2ad39fdb2 might
> consider adding a mutex either into hw_atl_b0_get_mac_temp() or into
> the calling code.

Hi Sebastian, Guenter, thanks for catching and taking care of this,
Looks good for me so far.

>> Could someone with hardware please verify it? It compiles, yes.
>>

We'll verify this on our side, sure.

Regards,
  Igor