On Wed, Sep 21, 2011 at 7:26 PM, Xiangliang Yu <yuxiangl@xxxxxxxxxxx> wrote:
>
>> Subject: [PATCH 4/5] mvsas: remove mvs_slave_{alloc|configure}
>>
>> libsas now handles:
>> 1/ limiting ata scanning to lun0
>> 2/ maximizing the queue_depth of sas devices (up to 256, mvsas only
>> supports 64)
>> 3/ changes to /sys/block/<sdX>/device/queue_depth for ata devices
>>
>> Cc: Xiangliang Yu <yuxiangl@xxxxxxxxxxx>
>> Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
>> ---
>> drivers/scsi/mvsas/mv_init.c | 4 ++--
>> drivers/scsi/mvsas/mv_sas.c | 30 ------------------------------
>> drivers/scsi/mvsas/mv_sas.h | 2 --
>> 3 files changed, 2 insertions(+), 34 deletions(-)
>>
>> diff --git a/drivers/scsi/mvsas/mv_init.c b/drivers/scsi/mvsas/mv_init.c
>> index 4e9af66..052861b 100644
>> --- a/drivers/scsi/mvsas/mv_init.c
>> +++ b/drivers/scsi/mvsas/mv_init.c
>> @@ -59,7 +59,7 @@ static struct scsi_host_template mvs_sht = {
>> .name = DRV_NAME,
>> .queuecommand = sas_queuecommand,
>> .target_alloc = sas_target_alloc,
>> - .slave_configure = mvs_slave_configure,
>> + .slave_configure = sas_slave_configure,
>> .slave_destroy = sas_slave_destroy,
>> .scan_finished = mvs_scan_finished,
>> .scan_start = mvs_scan_start,
>> @@ -74,7 +74,7 @@ static struct scsi_host_template mvs_sht = {
>> .use_clustering = ENABLE_CLUSTERING,
>> .eh_device_reset_handler = sas_eh_device_reset_handler,
>> .eh_bus_reset_handler = sas_eh_bus_reset_handler,
>> - .slave_alloc = mvs_slave_alloc,
>> + .slave_alloc = sas_slave_alloc,
>> .target_destroy = sas_target_destroy,
>> -int mvs_slave_configure(struct scsi_device *sdev)
>> -{
>> - struct domain_device *dev = sdev_to_domain_dev(sdev);
>> - int ret = sas_slave_configure(sdev);
>> -
>> - if (ret)
>> - return ret;
>> - if (!dev_is_sata(dev)) {
>> - sas_change_queue_depth(sdev,
>> - MVS_QUEUE_SIZE,
>> - SCSI_QDEPTH_DEFAULT);
>> - }
>> - return 0;
> Can you don't remove mvs_slave_configure function? Someday it will be useful, such as fixing some issue.
That's exactly the point of the patch. The isci driver encountered a
bug that the mvsas driver had fixed in its private mvs_slave_alloc()
routine. If I had taken the same approach and "fixed" it with a
isci_slave_alloc() routine that would still leave aic94xx or any other
future libsas driver to rediscover the fix.
If you later find a problem with sas_slave_configure() there's a good
chance the fix will be applicable to all libsas drivers. But if it is
truly a mvsas specific issue you can always re-introduce
mvs_slave_configure().
--
Dan
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