On 05/16/2014 01:46 PM, ching wrote: > Hi Tomas, > > Although in http://www.makelinux.net/ldd3/chp-7-sect-6, there said to flush > the shared workqueue requires calling function > flush_scheduled_work. > > But in kernel workqueue.c, there are comment of flush_scheduled_work said > that > "In most situations flushing the entire workqueue is overkill; you merely > need to know that a particular work item isn't > queued and isn't running." > > In such cases use flush_work is OK. > This can be proved in so many kernel device driver calling flush_work instead > of flush_scheduled_work.
Yes, I think now this is correct, I have no more objections. Thanks, Tomas, > > > On Thu, 2014-05-15 at 13:52 +0200, Tomas Henzl wrote: >> On 05/15/2014 12:49 PM, ching wrote: >>> Hi Tomas, >>> >>> Then I will have a patch 18/16 to replace flush_scheduled_work with >>> flush_work. >>> Thanks for your advice. >> Here http://www.makelinux.net/ldd3/chp-7-sect-6 is a short text about >> workqueue, >> the use of schedule_work in your sources means that you use the global queue. >> If that is true, flush_scheduled_work is the right choice. >> >>> On Wed, 2014-05-14 at 14:53 +0200, Tomas Henzl wrote: >>>> On 05/14/2014 01:55 PM, ching wrote: >>>>> From: Ching<ching2...@areca.com.tw> >>>>> >>>>> This is a new patch after patch v1.1 series. >>>>> >>>>> Fixed calling scsi_scan_host until all initialization are done. >>>>> And fixed error path free allocated resource. >>>>> >>>>> Signed-off-by: Ching<ching2...@areca.com.tw> >>>>> --- >>>>> >>>>> diff -uprN a/drivers/scsi/arcmsr/arcmsr_hba.c >>>>> b/drivers/scsi/arcmsr/arcmsr_hba.c >>>>> --- a/drivers/scsi/arcmsr/arcmsr_hba.c 2014-05-08 17:45:34.000000000 >>>>> +0800 >>>>> +++ b/drivers/scsi/arcmsr/arcmsr_hba.c 2014-05-14 18:29:30.000000000 >>>>> +0800 >>>>> @@ -112,6 +112,7 @@ static void arcmsr_hbaD_message_isr(stru >>>>> static void arcmsr_hardware_reset(struct AdapterControlBlock *acb); >>>>> static const char *arcmsr_info(struct Scsi_Host *); >>>>> static irqreturn_t arcmsr_interrupt(struct AdapterControlBlock *acb); >>>>> +static void arcmsr_free_irq(struct pci_dev *, struct AdapterControlBlock >>>>> *); >>>>> static int arcmsr_adjust_disk_queue_depth(struct scsi_device *sdev, >>>>> int queue_depth, int reason) >>>>> { >>>>> @@ -778,12 +779,11 @@ static int arcmsr_probe(struct pci_dev * >>>>> } >>>>> error = scsi_add_host(host, &pdev->dev); >>>>> if(error){ >>>>> - goto RAID_controller_stop; >>>>> + goto free_ccb_pool; >>>>> } >>>>> if (arcmsr_request_irq(pdev, acb) == ARC_FAILURE) >>>>> goto scsi_host_remove; >>>>> arcmsr_iop_init(acb); >>>>> - scsi_scan_host(host); >>>>> INIT_WORK(&acb->arcmsr_do_message_isr_bh, arcmsr_message_isr_bh_fn); >>>>> atomic_set(&acb->rq_map_token, 16); >>>>> atomic_set(&acb->ante_token_value, 16); >>>>> @@ -795,13 +795,17 @@ static int arcmsr_probe(struct pci_dev * >>>>> add_timer(&acb->eternal_timer); >>>>> if(arcmsr_alloc_sysfs_attr(acb)) >>>>> goto out_free_sysfs; >>>>> + scsi_scan_host(host); >>>>> return 0; >>>>> out_free_sysfs: >>>>> -scsi_host_remove: >>>>> - scsi_remove_host(host); >>>>> -RAID_controller_stop: >>>>> + del_timer_sync(&acb->eternal_timer); >>>>> + flush_work(&acb->arcmsr_do_message_isr_bh); >>>> In your driver you use both flush_work(struct work_struct *) and >>>> flush_scheduled_work(), >>>> the second form is used used to flush the shared workqueue. >>>> That said (and I think you use just one queue) you should decide which one >>>> is correct. >>>> In my previous mail I have asked about flush_work because i have it seen >>>> elsewhere in >>>> your code, now I've noticed the use of schedule_work and that means that >>>> you are using the global wq. >>>> >>>> >>>>> arcmsr_stop_adapter_bgrb(acb); >>>>> arcmsr_flush_adapter_cache(acb); >>>>> + arcmsr_free_irq(pdev, acb); >>>>> +scsi_host_remove: >>>>> + scsi_remove_host(host); >>>>> +free_ccb_pool: >>>>> arcmsr_free_ccb_pool(acb); >>>>> free_hbb_mu: >>>>> arcmsr_free_mu(acb); >>>>> >>>>> >>>>> -- >>>>> To unsubscribe from this list: send the line "unsubscribe linux-scsi" in >>>>> the body of a message to majord...@vger.kernel.org >>>>> More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- > To unsubscribe from this list: send the line "unsubscribe linux-scsi" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
