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Message-ID: <20100304201548.GA1341@elf.ucw.cz> Date: Thu, 4 Mar 2010 21:15:48 +0100 From: Pavel Machek <pavel@....cz> To: "Rafael J. Wysocki" <rjw@...k.pl> Cc: Alan Stern <stern@...land.harvard.edu>, Jens Axboe <jens.axboe@...cle.com>, Maxim Levitsky <maximlevitsky@...il.com>, linux-pm <linux-pm@...ts.linux-foundation.org>, linux-kernel <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org> Subject: Re: [linux-pm] Is it supposed to be ok to call del_gendisk while userspace is frozen? Hi! > > My thought exactly. This is the only approach that also solves the > > following race: > > > > A driver is unloaded at the same time as a suspend starts. > > > > The writeback thread gets frozen. > > > > Then before the rmmod thread is frozen, it calls del_gendisk. > > > > Delaying things by means of a workqueue (or the equivalent) might also > > work, but it doesn't seem as safe. For example, some important > > writebacks might end up getting delayed until too late. Delaying writebacks during sleep should be ok... That's why we do sync() after userspace is frozen -- nothing really important should be waiting for writeback after that point. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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