Re: megaraid driver always fails to reset adapter

["Jun'ichi Nomura" <jnomura@mtc.biglobe.ne.jp>]

Hi,
thanks for the info.

Adding one more 'F' to the loop counter works.
i.e. 0xFFFFFF.

Just adding rmb() didn't solve the problem though it
may decrease the necessary counter value.

I don't know this value is ok for environments other than mine.

Bagalkote, Sreenivas wrote:
> Please try:
> 
> In mbox_post_sync_cmd_fast(...) replace
> 
> for (i = 0; i < 0xFFFFF; i++) {
> 	if (mbox->numstatus != 0xFF) break;
> }
> 
> with
> 
> for (i = 0; i < 0xFFFFF; i++) {
> 	if (mbox->numstatus != 0xFF) break;
> 	rmb();
> } 
> 
> Additionally, increase the loop counter to a bigger value.
> 
> Thanks,
> Sreenivas
> LSI LOGIC Corporation 
> 
> 
>>-----Original Message-----
>>From: Jun'ichi Nomura [mailto:jnomura@mtc.biglobe.ne.jp] 
>>Sent: Tuesday, March 01, 2005 1:36 PM
>>To: linux-scsi@vger.kernel.org
>>Subject: megaraid driver always fails to reset adapter
>>
>>Hello,
>>
>>I found that the megaraid driver always fails to reset the
>>adapter with the following message:
>>   megaraid: resetting the host...
>>   megaraid mbox: reset sequence completed successfully
>>   megaraid: fast sync command timed out
>>   megaraid: reservation reset failed
>>when the "Cluster mode" of the adapter BIOS is enabled.
>>So, whenever the reset occurs, the adapter goes to
>>offline and just become unavailable.
>>
>>Is this a known problem?
>>
>>I tried 2.6.9 and 2.6.11-rc5 and the results were the same.
>>I used sg_reset to invoke reset artificially to test this.
>>
>>The problem doesn't occur if I disabled the "Cluster mode"
>>parameter in the adapter BIOS.
>>
>>I'm not sure how well the currenet megaraid driver supports
>>the "Cluster mode".
>>I appreciate if you have any idea.
>>
>>Thanks,
>>Jun'ichi Nomura