linux-kernel - Re: [PATCH v4] usb: gadget: storage_common: make FSG_NUM

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Message-ID: <op.v0goo5cc3l0zgt@mnazarewicz-glaptop>
Date:	Fri, 19 Aug 2011 14:52:07 +0200
From:	"Michal Nazarewicz" <mina86@...a86.com>
To:	"Per Forlin" <per.forlin@...aro.org>
Cc:	"Felipe Balbi" <balbi@...com>,
	"Greg Kroah-Hartman" <gregkh@...e.de>,
	"Per Forlin" <per.forlin@...ricsson.com>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	linaro-dev@...ts.linaro.org
Subject: Re: [PATCH v4] usb: gadget: storage_common: make FSG_NUM_BUFFERS
 variable size

On Fri, 19 Aug 2011 13:42:08 +0200, Per Forlin <per.forlin@...aro.org>  
wrote:
> Is it true that fsg_common_init() will never be called twice to
> initialise the same fsg_common structure. It is always called once
> followed by release.
> If this is the case it is safe to only:
> if (common->buffhds)
>   common->buffhds = kzalloc()

You should just always do common->buffhds = kcalloc(fsg_num_buffhds,
sizeof *common->buffhds, GFP_KERNEL) in fsg_common_init() and then
kfree() in release.

-- 
Best regards,                                         _     _
.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  Michal "mina86" Nazarewicz    (o o)
ooo +-----<email/xmpp: mnazarewicz@...gle.com>-----ooO--(_)--Ooo--
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