On 09/22/2015 10:04 PM, Ewan Milne wrote:
> On Thu, 2015-08-27 at 14:41 +0200, Hannes Reinecke wrote:
>> When we read in the target port group state we should be
>> updating all affected port groups, otherwise we risk
>> running out of sync.
>>
>> Signed-off-by: Hannes Reinecke <[email protected]>
>> ---
>> drivers/scsi/device_handler/scsi_dh_alua.c | 21 +++++++++++++++++----
>> 1 file changed, 17 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c
>> b/drivers/scsi/device_handler/scsi_dh_alua.c
>> index 8717fd3..2fa985e 100644
>> --- a/drivers/scsi/device_handler/scsi_dh_alua.c
>> +++ b/drivers/scsi/device_handler/scsi_dh_alua.c
>> @@ -477,11 +477,13 @@ static int alua_check_sense(struct scsi_device *sdev,
>> static int alua_rtpg(struct scsi_device *sdev, struct alua_port_group *pg)
>> {
>> struct scsi_sense_hdr sense_hdr;
>> + struct alua_port_group *tmp_pg;
>> int len, k, off, valid_states = 0, bufflen = ALUA_RTPG_SIZE;
>> unsigned char *ucp, *buff;
>> unsigned err, retval;
>> unsigned int tpg_desc_tbl_off;
>> unsigned char orig_transition_tmo;
>> + unsigned long flags;
>>
>> if (!pg->expiry) {
>> if (!pg->transition_tmo)
>> @@ -584,17 +586,28 @@ static int alua_rtpg(struct scsi_device *sdev, struct
>> alua_port_group *pg)
>> else
>> tpg_desc_tbl_off = 4;
>>
>> + spin_lock_irqsave(&port_group_lock, flags);
>> for (k = tpg_desc_tbl_off, ucp = buff + tpg_desc_tbl_off;
>> k < len;
>> k += off, ucp += off) {
>
> "ucp" is not really a good variable name, it matches nothing in the T10
> spec. The structure is a "Target Port Group Descriptor". I realize it
> was already there, but maybe this is a good opportunity to change it?
>
Doug Gilbert is to blame; I've copied this section over from sg3_utils :-)
But yeah, I can set it to eg 'desc'.
>>
>> - if (pg->group_id == get_unaligned_be16(&ucp[2])) {
>> - pg->state = ucp[0] & 0x0f;
>> - pg->pref = ucp[0] >> 7;
>> - valid_states = ucp[1];
>> + list_for_each_entry(tmp_pg, &port_group_list, node) {
>> + u16 group_id = get_unaligned_be16(&ucp[2]);
>
> This is invariant and should be outside the loop.
>
True.
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
[email protected] +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg)
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