linux-kernel - Re: [PATCH 03/13] android: binder: refactor binder_thread

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Date:	Fri, 29 May 2015 13:06:21 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Riley Andrews <riandrews@...roid.com>
Cc:	linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Arve Hjønnevåg <arve@...roid.com>,
	devel@...verdev.osuosl.org
Subject: Re: [PATCH 03/13] android: binder: refactor binder_thread_write

This patch is ok.

Reviewed-by: Dan Carpenter <dan.carpenter@...cle.com>

On Thu, May 28, 2015 at 04:08:21PM -0700, Riley Andrews wrote:
> +static void binder_call_inc_dec_ref(struct binder_thread *thread,
> +				    uint32_t target, uint32_t cmd)
> +{
> +	struct binder_proc *proc = thread->proc;
> +	struct binder_ref *ref;
> +	const char *debug_string;
> +
> +	if (target == 0 && binder_context_mgr_node &&
> +	    (cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
> +		ref = binder_get_ref_for_node(proc, binder_context_mgr_node);
> +		if (ref->desc != target) {
> +			binder_user_error("%d:%d tried to acquire reference to desc 0, got %d instead\n",
> +					  proc->pid, thread->pid, ref->desc);
> +			return;

Presumably we never hit this error condition.  In the original code we
printed an error and continued but now we bail on error.  Presumably
this is a theoretical bug fix which doesn't affect real life so I will
allow it.  But in the future don't mix behaviour changes with clean up
patches.

> +		}
> +	} else {
> +		ref = binder_get_ref(proc, target);
> +	}
> +	if (!ref) {

In the original code this was "if (ref == NULL)".  Please don't mix
these kinds of cleanups with moving code around because it makes it
harder for me to review.  Do that in a separate patch.

regards,
dan carpenter

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