On 10/08/2010 06:39 PM, James Bottomley wrote:
> On Fri, 2010-10-08 at 17:51 +0200, Tomas Henzl wrote:
>
>> On 09/23/2010 04:36 AM, bo yang wrote:
>>
>>> This patch is too big. I am using attachment to submit. Please
>>> use attached file to apply. Also let me know if it can't be accepted.
>>>
>>> To add the Online controller reset support, driver need to do:
>>> a). reset the controller chips -- Xscale and Gen2 which will change
>>> the function calls and add the reset function related to this two
>>> chips.
>>> b). during the reset, driver will store the pending cmds which not
>>> returned by FW to driver's pending queue. Driver will re-issue those
>>> pending cmds again to FW after the OCR finished.
>>> c). In driver's timeout routine, driver will report to OS as reset.
>>> Also driver's queue routine will block the cmds until the OCR
>>> finished.
>>> d). in Driver's ISR routine, if driver get the FW state as state
>>> change, FW in Failure status and FW support online controller
>>> reset (OCR), driver will start to do the controller reset.
>>> e). In driver's IOCTL routine, the application cmds will wait for the
>>> OCR to finish, then issue the cmds to FW.
>>>
>>> Signed-off-by Bo Yang<bo.yang@xxxxxxx>
>>>
>>> ---
>>> drivers/scsi/megaraid/megaraid_sas.c | 756 ++++++++++++++++++++++++++++++++---
>>> drivers/scsi/megaraid/megaraid_sas.h | 88 +++-
>>> 2 files changed, 787 insertions(+), 57 deletions(-)
>>>
>> Hi Bo,
>> in the workqueue function you sleep for 30s,
>> it's scheduled here - schedule_work(&instance->work_init);
>>
>> +process_fw_state_change_wq(struct work_struct *work)
>> +{
>> ...
>> + /*waitting for about 20 second before start the second init*/
>> + for (wait = 0; wait < 30; wait++) {
>> + msleep(1000);
>> + }
>>
> this lot should be ssleep(20) if you want a 20 sec sleep.
>
please do that on every place where you use the
"for (wait = 0; wait < n; wait++) msleep(1000);" construction
>> - this is not a good practice to sleep for a so long time I think
>>
this long sleep might might be ok, if the workqueue is used only rarely
is it so?
>> - you should use in your exit function some synchronization
>> for example 'cancel_work_sync', without that if someone rmmods your
>> module, it could then lead to a memory corruption
>>
> Actually flush_scheduled_work() should be fine ... it will force the
> module removal to wait for completion ... cancellation can be error
> prone, so just forcing the wait sounds easier.
>
someone told that cancel_work_sync is safer then flush_scheduled_work
but I'm not an expert, so ok
Tomas
> James
>
>
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