linux-kernel - Re: [PATCH v2] firewire: Fix 'failed to read phy reg' on FW643 rev8

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Message-ID: <20130428141559.0439c881@stein>
Date:	Sun, 28 Apr 2013 14:15:59 +0200
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	linux1394-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] firewire: Fix 'failed to read phy reg' on FW643 rev8

On Mar 26 Peter Hurley wrote:
> --- a/drivers/firewire/ohci.c
> +++ b/drivers/firewire/ohci.c
> @@ -2268,8 +2268,8 @@ static int ohci_enable(struct fw_card *card,
>  		  OHCI1394_HCControl_postedWriteEnable);
>  	flush_writes(ohci);
>  
> -	for (lps = 0, i = 0; !lps && i < 3; i++) {
> -		msleep(50);
> +	for (lps = 0, i = 0; !lps && i < 150; i++) {
> +		msleep(1);
>  		lps = reg_read(ohci, OHCI1394_HCControlSet) &
>  		      OHCI1394_HCControl_LPS;
>  	}

This duplicates a mistake (?) that we already did a few times elsewhere in
firewire-ohci:  msleep(1) may put the thread to sleep for much, much longer
than 1 millisecond.  I will propose a patch soon.
-- 
Stefan Richter
-=====-===-= -=-- ===--
http://arcgraph.de/sr/
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