From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from gate.crashing.org (gate.crashing.org [63.228.1.57]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by bilbo.ozlabs.org (Postfix) with ESMTPS id 5B272B7B7D for ; Thu, 30 Jul 2009 10:52:38 +1000 (EST) Subject: Re: BUG in dma-mapping.h:218 // MESH SCSI driver not working From: Benjamin Herrenschmidt To: Stef Simoens In-Reply-To: <4A70DE54.5090406@scarlet.be> References: <4A68E1CE.4040307@scarlet.be> <1248425553.25467.20.camel@pasglop> <4A70937B.7040201@scarlet.be> <1248910358.1509.27.camel@pasglop> <4A70DE54.5090406@scarlet.be> Content-Type: text/plain Date: Thu, 30 Jul 2009 10:52:29 +1000 Message-Id: <1248915149.1509.29.camel@pasglop> Mime-Version: 1.0 Cc: linuxppc-dev@lists.ozlabs.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Thu, 2009-07-30 at 01:42 +0200, Stef Simoens wrote: > What would be the best approach? > - if the kernel boots, it's obviously 'good' > - but what if the kernel hits the 'BUG', should I apply your patch > then? If it doesn't work with your patch, would it be 'bad' then? Yes. > > One thing I know is that the MESH HW has "issues" that make it very > > sensitive to alignment DMA buffers, it's possible that the SCSI stack no > > longer aligns some stuff ? > > > Hmm, great... how can I verify this? I will once we get a closer idea of where the bug started to happen. Thanks ! Cheers, Ben.