linux-kernel - Re: [PATCH 1/1] Staging: hv: mousevsc: Move the mouse driver out of staging

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Date:	Mon, 17 Oct 2011 01:28:47 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Joe Perches <joe@...ches.com>
Cc:	"K. Y. Srinivasan" <kys@...rosoft.com>, dmitry.torokhov@...il.com,
	Haiyang Zhang <haiyangz@...rosoft.com>, gregkh@...e.de,
	linux-kernel@...r.kernel.org, virtualization@...ts.osdl.org,
	linux-input@...r.kernel.org, devel@...uxdriverproject.org
Subject: Re: [PATCH 1/1] Staging: hv: mousevsc: Move the mouse driver out of
 staging

On Fri, Oct 14, 2011 at 11:36:36PM -0700, Joe Perches wrote:
> This do {} while (1); seems like it could be simpler,
> less indented and less confusing if it used continues
> or gotos like below (if I wrote it correctly...)
> 
> loop:
> 	ret = vmbus_bus_recvpacket_raw(device->channel, buffer,
> 				       bufferlen, &bytes_recvd, &req_id);
> 	switch (ret) {
> 	case -ENOBUFS:
> 		/* Handle large packet */
> 		bufferlen = bytes_recvd;
> 		buffer = kzalloc(bytes_recvd, GFP_ATOMIC);
> /*
> Why kzalloc and not kmalloc?
> The stack variable packet is not memset to 0,
> why should buffer be zeroed?
> */
> 		if (!buffer)
> 			return;
> 		goto loop;
> 	case 0:
> 		if (bytes_recvd <= 0)
> 			goto loop;

In the original we called break here (which is equivelent to a
return).  Btw setting a stack variable and then returning immediately
like the original code did is pointless.

regards,
dan carpenter
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