From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759892Ab2CaNzC (ORCPT ); Sat, 31 Mar 2012 09:55:02 -0400 Received: from nm9-vm4.bullet.mail.ne1.yahoo.com ([98.138.91.169]:37671 "HELO nm9-vm4.bullet.mail.ne1.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1754746Ab2CaNy7 convert rfc822-to-8bit (ORCPT ); Sat, 31 Mar 2012 09:54:59 -0400 X-Greylist: delayed 331 seconds by postgrey-1.27 at vger.kernel.org; Sat, 31 Mar 2012 09:54:59 EDT X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 805906.23743.bm@omp1066.mail.ne1.yahoo.com DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:Cc:In-Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding; b=grR0kS7CBq0FPWdqc9wdLO5cL7s58/m5CAbOmJxKE45qdQZUD3clHGzTtMkYiIlWR6H5MKu9oyPMxW2mxgR+E0SGedK250qzjdDTExger5rwl2UEGOG0OEHOl4/lsl6eLRELshFSyxXd1fxpg5ImvWa4EeRRN3R57ii94IZjwXI=; X-YMail-OSG: _ml1_0EVM1lUwndi_fQPXkAzoWlrJVqTP4uPoU1GdpOM3I_ 6YzfX1khu9ltTekO3M4Mp_bn6LShiwfQVZvodjHhQCF5eP_Pv0tzO0dCqwqE b.CCPE4AHswMrIvjjebzJ5p6nt8Ym.SYtLfo_NkN6Emx_CKMG6h.JIXiiy.Q RzUty_RHz5bkD84xdh_W4IU85KYW9gxnro853Uf4VyF.j2xiRBpxzw_2JiIx bkWqc1h_0qQxrCkW4w5YvTw0KJkGSM2iUphVVom86F393Ecdq_sFnTZVUZto kFGcRub4kkKHI1nDx7FDVD24T_9jJi8uVwwtz21ibq.Kbx6PM5sTR9DGqkgH 7ObiK3JTVmfwW2VK.i1L.O3_c5DkxhPpLo9JWdFC4Tr2c5OThOeHzkw7heXh rlw5aU48sVrMTyi7.zYfTZVab7GSnCl.92X.G4f6JArQcyOJzMGAQxMt1EZz JSrQv13eSS5rBR1naTVKv80Cs2sdDG5NwCBeuMGFSEJ0y3Dr4XwRXChceWi3 wGtTZIlt4vGZ.dUX9_H7oQbgahlNI2MKspBh1GxI- X-Mailer: YahooMailWebService/0.8.117.340979 References: <20120330113915.GE9075@marvin.atrad.com.au> Message-ID: <1333201767.36239.YahooMailNeo@web121005.mail.ne1.yahoo.com> Date: Sat, 31 Mar 2012 06:49:27 -0700 (PDT) From: Alex Dubov Reply-To: Alex Dubov Subject: Re: Possible issue with tifm_7xx1 and interrupt latency To: Jonathan Woithe Cc: "linux-mmc@vger.kernel.org" , "linux-kernel@vger.kernel.org" In-Reply-To: <20120330113915.GE9075@marvin.atrad.com.au> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org ----- Original Message ----- > From: Jonathan Woithe > > Although somewhat circumstancial, during the debugging of a FFADO issue with > a user it seemed possible that the tifm_7xx1 module may have been switching > interrupts off for long periods of time.  For a full history of the problem > please refer to > >   http://subversion.ffado.org/ticket/250 > > Unfortunately the original reporter no longer has access to the hardware > concerned and the report itself dates from 2 years ago (I kept forgetting > to report it).  However, it may be useful none-the-less. Unfortunately, I don't have access to that hardware either. However, there are really only few operations in that driver between "irqsave" and "irqrestore", unless PIO mode is used (which may, ostensibly, cause this sort of interrupt delays). On the other hand, PIO mode there is purely intended for troubleshooting purposes and can only be enabled through special module parameter by an adventurous user. > > Please CC me any replies. > > Thanks >   jonathan Regards, Alex