From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753382AbdKXEpT (ORCPT ); Thu, 23 Nov 2017 23:45:19 -0500 Received: from mail-pg0-f67.google.com ([74.125.83.67]:34623 "EHLO mail-pg0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752367AbdKXEpQ (ORCPT ); Thu, 23 Nov 2017 23:45:16 -0500 X-Google-Smtp-Source: AGs4zMZkseWGvPP98GNGkkVOeBiyEijS5u083C1UTaPhs5FUNSjFiIQDHHrd7DpEnC0m74cJYJfg8w== Subject: Re: [PATCH 1/3] scsi: arcmsr: Add driver module parameter msi_enable From: Ching Huang To: Dan Carpenter Cc: martin.petersen@oracle.com, James.Bottomley@HansenPartnership.com, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, jthumshirn@suse.de, hare@suse.de, hch@infradead.org In-Reply-To: <20171123104408.jkslvj2axy4svt4a@mwanda> References: <1511400439.9832.19.camel@Centos6.3-64> <20171123104408.jkslvj2axy4svt4a@mwanda> Content-Type: text/plain; charset="UTF-8" Date: Fri, 24 Nov 2017 04:45:09 +0800 Message-ID: <1511469909.4370.14.camel@Centos6.3-64> Mime-Version: 1.0 X-Mailer: Evolution 2.32.3 (2.32.3-37.el6) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello Dan, On Thu, 2017-11-23 at 13:44 +0300, Dan Carpenter wrote: > On Thu, Nov 23, 2017 at 09:27:19AM +0800, Ching Huang wrote: > > From: Ching Huang > > > > Add module parameter msi_enable to has a chance to disable msi interrupt if it does not work properly. > > > > Signed-off-by: Ching Huang > > --- > > > > diff -uprN a/drivers/scsi/arcmsr/arcmsr_hba.c b/drivers/scsi/arcmsr/arcmsr_hba.c > > --- a/drivers/scsi/arcmsr/arcmsr_hba.c 2017-11-23 14:29:26.000000000 +0800 > > +++ b/drivers/scsi/arcmsr/arcmsr_hba.c 2017-11-23 16:02:28.000000000 +0800 > > @@ -75,6 +75,10 @@ MODULE_DESCRIPTION("Areca ARC11xx/12xx/1 > > MODULE_LICENSE("Dual BSD/GPL"); > > MODULE_VERSION(ARCMSR_DRIVER_VERSION); > > > > +static int msi_enable = 1; > > +module_param(msi_enable, int, S_IRUGO); > ^^^^^^^ > checkpatch.pl will complain that this should be 0444 S_IRUGO value is 00444, defined in -> . A. It will be not a issue. > > > +MODULE_PARM_DESC(msi_enable, " Enable MSI interrupt(0 ~ 1), msi_enable=1(enable), =0(disable)"); > ^ > Remove the extra space OK > > > + > > static int host_can_queue = ARCMSR_DEFAULT_OUTSTANDING_CMD; > > module_param(host_can_queue, int, S_IRUGO); > > MODULE_PARM_DESC(host_can_queue, " adapter queue depth(32 ~ 1024), default is 128"); > > @@ -831,11 +835,15 @@ arcmsr_request_irq(struct pci_dev *pdev, > > pr_info("arcmsr%d: msi-x enabled\n", acb->host->host_no); > > flags = 0; > > } else { > > - nvec = pci_alloc_irq_vectors(pdev, 1, 1, > > - PCI_IRQ_MSI | PCI_IRQ_LEGACY); > > + if (msi_enable == 1) > > + nvec = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSI); > > + else > > + nvec = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_LEGACY); > > if (nvec < 1) > > return FAILED; > > I feel like we should try PCI_IRQ_MSI then if it fails we could fall > back to PCI_IRQ_LEGACY. Originally, it worked like this and now it just > fails unless you toggle the module param. It's a regression. update as below --- unsigned int irq_flag; irq_flag = PCI_IRQ_LEGACY; if (msi_enable == 1) irq_flag |= PCI_IRQ_MSI; nvec = pci_alloc_irq_vectors(pdev, 1, 1, irq_flag); > > > > + if (msi_enable == 1) > > + pr_info("arcmsr%d: msi enabled\n", acb->host->host_no); > > This printk could be improved. Use dev_info(&pdev->dev, for a start. > I know that the other prints don't use this, but we could use it one > time then slowly add more users until more are using dev_info() than > pr_info() and then someone will decide to clean up the old users. update as below --- if (msi_enable == 1) dev_info(&pdev->dev, "msi enabled\n"); > > regards, > dan carpenter >