linux-kernel - Re: [PATCH] rt2x00: BUG: remove double loop on REGISTER_BUSY

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Message-ID: <20140403173701.75c1f497@north>
Date:	Thu, 3 Apr 2014 17:37:01 +0200
From:	Jakub Kiciński <moorray3@...pl>
To:	Richard Genoud <richard.genoud@...il.com>
Cc:	Ivo van Doorn <IvDoorn@...il.com>,
	Gertjan van Wingerde <gwingerde@...il.com>,
	Helmut Schaa <helmut.schaa@...glemail.com>,
	"John W. Linville" <linville@...driver.com>,
	linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rt2x00: BUG: remove double loop on REGISTER_BUSY_COUNT

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.

Also, how would this be a BUG? 

	-- kuba
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