linux-kernel - Re: [PATCH] Revert "Staging: panel: usleep

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Message-ID: <20160125125127.GB29998@sudip-pc>
Date:	Mon, 25 Jan 2016 18:21:27 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Joe Perches <joe@...ches.com>
Cc:	Dan Carpenter <dan.carpenter@...cle.com>,
	Willy Tarreau <willy@...a-x.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devel@...verdev.osuosl.org,
	Sirnam Swetha <theonly.ultimate@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Revert "Staging: panel: usleep_range is preferred over
 udelay"

On Mon, Jan 25, 2016 at 04:47:26AM -0800, Joe Perches wrote:
> On Mon, 2016-01-25 at 12:16 +0300, Dan Carpenter wrote:
> > Ugh...  Checkpatch told us to introduce bugs...  :(  We almost certainly
> > would have missed this bug in review, but it wasn't sent to the list so
> > I guess we'll never know.
> 
> So when isn't usleep_range preferred over udelay?

inside a spin_lock or in some interrupt routine.

regards
sudip