Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755550Ab0K3SFW (ORCPT ); Tue, 30 Nov 2010 13:05:22 -0500 Received: from na3sys009aog113.obsmtp.com ([74.125.149.209]:42957 "EHLO na3sys009aog113.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754560Ab0K3SFT convert rfc822-to-8bit (ORCPT ); Tue, 30 Nov 2010 13:05:19 -0500 From: "Yang, Bo" To: Tomas Henzl CC: "'James.Bottomley@HansenPartnership.com'" , "'linux-scsi@vger.kernel.org'" , "'akpm@osdl.org'" , "'linux-kernel@vger.kernel.org'" Date: Tue, 30 Nov 2010 11:05:35 -0700 Subject: RE: [PATCH 7/9] scsi: megaraid_sas - Driver created the self work queue for OCR Thread-Topic: [PATCH 7/9] scsi: megaraid_sas - Driver created the self work queue for OCR Thread-Index: AcuQqUC9voeXQiFpRrqrpeSHWgigPQACJHFg Message-ID: <4B6A08C587958942AA3002690DD4F8C30106BBFEB5@cosmail02.lsi.com> References: <4B6A08C587958942AA3002690DD4F8C3D0804533@cosmail02.lsi.com> <4B6A08C587958942AA3002690DD4F8C3DBD67F68@cosmail02.lsi.com> <4B6A08C587958942AA3002690DD4F8C30106A961BD@cosmail02.lsi.com> <4B6A08C587958942AA3002690DD4F8C30106A961D6@cosmail02.lsi.com> <4B6A08C587958942AA3002690DD4F8C30106A961E4@cosmail02.lsi.com> <4B6A08C587958942AA3002690DD4F8C30106A961F2@cosmail02.lsi.com> <4B6A08C587958942AA3002690DD4F8C30106A96213@cosmail02.lsi.com> <4B6A08C587958942AA3002690DD4F8C30106A96218@cosmail02.lsi.com> <4B6A08C587958942AA3002690DD4F8C30106A9621E@cosmail02.lsi.com> <4CF5221E.8080603@redhat.com> In-Reply-To: <4CF5221E.8080603@redhat.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2912 Lines: 60 Tomas, In which case megasas_ocr_wq will hit NULL if create_workqueue create work queue success? If create_workqueue failed, OCR may have the problem. But do you know if create_workqueue has the number limitation for creating work queues (how many work queue can it created? 10 or 20)? Thanks, Bo Yang -----Original Message----- From: Tomas Henzl [mailto:thenzl@redhat.com] Sent: Tuesday, November 30, 2010 11:11 AM To: Yang, Bo Cc: 'James.Bottomley@HansenPartnership.com'; 'linux-scsi@vger.kernel.org'; 'akpm@osdl.org'; 'linux-kernel@vger.kernel.org' Subject: Re: [PATCH 7/9] scsi: megaraid_sas - Driver created the self work queue for OCR On 11/19/2010 06:37 PM, Yang, Bo wrote: > Driver created the owner work queue (don't use global work queue). This queue will be used for online controller reset routine. > > Signed-off-by Bo Yang > > --- > drivers/scsi/megaraid/megaraid_sas.c | 13 ++++++++++++- > 1 file changed, 12 insertions(+), 1 deletion(-) > > diff -rupN old/drivers/scsi/megaraid/megaraid_sas.c > new/drivers/scsi/megaraid/megaraid_sas.c --- > old/drivers/scsi/megaraid/megaraid_sas.c 2010-11-17 13:46:11.000000000 > -0500 +++ new/drivers/scsi/megaraid/megaraid_sas.c 2010-11-17 > 13:47:46.000000000 -0500 @@ -108,6 +108,7 @@ static struct > megasas_mgmt_info megasas_ static struct fasync_struct > *megasas_async_queue; static DEFINE_MUTEX(megasas_async_queue_mutex); > +static struct workqueue_struct *megasas_ocr_wq; static int > megasas_poll_wait_aen; static > DECLARE_WAIT_QUEUE_HEAD(megasas_poll_wait); static u32 > support_poll_for_event; @@ -2435,7 +2436,7 @@ > megasas_deplete_reply_queue(struct megas printk(KERN_NOTICE "megasas: > fwState=%x, stage:%d\n", fw_state, instance->adprecovery); - > schedule_work(&instance->work_init); + queue_work(megasas_ocr_wq, > &instance->work_init); return IRQ_HANDLED; } else { @@ -5157,6 > +5158,11 @@ static int __init megasas_init(void) goto err_pcidrv; } + > megasas_ocr_wq = create_workqueue("megasas_ocr"); + + if ( > !megasas_ocr_wq ) + printk(KERN_DEBUG "megasas: Failed to create > workqueue.\n"); + What happens later, when you pass the null pointer to the queue_work ? I'm not sure this will work. > rval = driver_create_file(&megasas_pci_driver.driver, > &driver_attr_version); if (rval) @@ -5228,6 +5234,11 @@ static void > __exit megasas_exit(void) &driver_attr_release_date); > driver_remove_file(&megasas_pci_driver.driver, &driver_attr_version); > + if (megasas_ocr_wq) { + destroy_workqueue(megasas_ocr_wq); + > megasas_ocr_wq = NULL; + } + > pci_unregister_driver(&megasas_pci_driver); > unregister_chrdev(megasas_mgmt_majorno, "megaraid_sas_ioctl"); } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/