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From: Mark Balantzyan <mbalant3@gmail.com>
To: linux@roeck-us.net
Cc: wim@linux-watchdog.org, linux-watchdog@vger.kernel.org
Subject: Question about pc87413_wdt.ko
Date: Mon, 29 Jul 2019 07:38:12 -0700 (PDT)	[thread overview]
Message-ID: <alpine.DEB.2.21.1907290727580.33358@mbalantz-desktop> (raw)

Hi Guenter,

My name is Mark, we corresponded in the recent past concerning a different 
kernel module.

I would just like to ask a question about pc87413_wdt.ko. In 
pc87413_wdt.c, the function pc87413_init() calls pc87413_swc_base_addr() 
and swc_base_addr gets assigned to. But pc87413_open() calls pc87413_refresh() 
which has spinlocks around swc_base_addr. There may be a use before 
initialization, so spinlocks get in the way. Is there a case possible 
where a bug/race condition may be occurring here? Or is there a hardware 
synchronization somewhere?

Thank you,
Mark

             reply	other threads:[~2019-07-29 14:38 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-29 14:38 Mark Balantzyan [this message]
2019-07-29 14:54 ` Question about pc87413_wdt.ko Guenter Roeck

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