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@xxxxxxxxxx] Sent: Tuesday, November 30, 2010 11:11 AM To: Yang, Bo Cc: 'James.Bottomley@xxxxxxxxxxxxxxxxxxxxx'; 'linux-scsi@xxxxxxxxxxxxxxx'; 'akpm@xxxxxxxx'; 'linux-kernel@xxxxxxxxxxxxxxx' 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<bo.yang@xxxxxxx> > > --- > 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-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
