Date: Fri, 4 Apr 2014 10:19:09 +0200
From: Stanislaw Gruszka <sgruszka@redhat.com>
To: Jakub =?utf-8?B?S2ljacWEc2tp?= <moorray3@wp.pl>
Cc: Richard Genoud <richard.genoud@gmail.com>,
        Ivo van Doorn <IvDoorn@gmail.com>,
        Gertjan van Wingerde <gwingerde@gmail.com>,
        Helmut Schaa <helmut.schaa@googlemail.com>,
        "John W. Linville" <linville@tuxdriver.com>,
        linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] rt2x00: BUG: remove double loop on REGISTER_BUSY_COUNT
Message-ID: <20140404081908.GB1448@redhat.com>
References: <1396534327-12971-1-git-send-email-richard.genoud@gmail.com>
 <20140403173701.75c1f497@north>
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On Thu, Apr 03, 2014 at 05:37:01PM +0200, Jakub Kiciński wrote:
> On Thu,  3 Apr 2014 16:12:07 +0200, Richard Genoud wrote:
> > rt2x00usb_register_read_lock() calls rt2x00usb_vendor_req_buff_lock()
> > that calls rt2x00usb_vendor_request() which is already looping up to
> > REGISTER_BUSY_COUNT times.
> > 
> > So this loop is not needed.
> 
> Not true.  rt2x00usb_vendor_request() busy-waits for usb_control_msg()
> to succeed, rt2x00usb_register_read_lock() busy-waits for the register
> field itself to become 0.

Yeah, but still we are looping REGISTER_BUSY_COUNT*REGISTER_BUSY_COUNT
what seems to be far too long.

Stanislaw 
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