From mboxrd@z Thu Jan 1 00:00:00 1970 From: Oliver Neukum Subject: Re: [V3 PATCH 4/4] scsi:stex.c Add S3/S4 support Date: Wed, 10 Dec 2014 10:02:33 +0100 Message-ID: <1418202153.7241.6.camel@linux-0dmf.site> References: <5487A406.8060902@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <5487A406.8060902@gmail.com> Sender: linux-kernel-owner@vger.kernel.org To: Charles Chiou Cc: JBottomley@parallels.com, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, grace.chang@tw.promise.com, victor.p@promise.com, ed.lin@promise.com List-Id: linux-scsi@vger.kernel.org On Wed, 2014-12-10 at 09:38 +0800, Charles Chiou wrote: > From 91868d4afe10533b8a4496075109e411100217bb Mon Sep 17 00:00:00 2001 > From: Charles Chiou > Date: Fri, 7 Nov 2014 10:15:18 +0800 > Subject: [PATCH 4/4] scsi:stex.c Add S3/S4 support > > Add S3/S4 support, add .suspend and .resume function in pci_driver. > > Pegasus need 30~40 seconds to boot up. We don't want to OS wait > in .resume function. Create a thread to handle device boot up. > > +static int stex_resume(struct pci_dev *pdev) > +{ > + struct st_hba *hba = pci_get_drvdata(pdev); > + struct hba_handshake_workstruct *hswork; > + int sts; > + > + hba->mu_status = MU_STATE_STARTING; > + hswork = kzalloc(sizeof(struct hba_handshake_workstruct), GFP_KERNEL); The system is coming back from sleep. You cannot swap or page out as disks may still be asleep. GFP_KERNEL is automatically changed to GFP_NOIO. It would be nice to outright use GFP_NOIO. > + INIT_WORK(&hswork->handshake_work, resume_handshake); Memory allocations can fail. I suggest you allocate the memory in suspend(). There you can just return -ENOMEM in the error case. Regards Oliver