linux-kernel - Re: [PATCH 2/3] jffs2: avoid soft-lockup in jffs2_reserve_space

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Date:	Wed, 12 Feb 2014 09:42:36 +0800
From:	Li Zefan <lizefan@...wei.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	LKML <linux-kernel@...r.kernel.org>, <dwmw2@...radead.org>,
	<linux-mtd@...ts.infradead.org>
Subject: Re: [PATCH 2/3] jffs2: avoid soft-lockup in jffs2_reserve_space_gc()

>> --- a/fs/jffs2/nodemgmt.c
>> +++ b/fs/jffs2/nodemgmt.c
>> @@ -216,15 +216,20 @@ int jffs2_reserve_space_gc(struct jffs2_sb_info *c, uint32_t minsize,
>>  
>>  	jffs2_dbg(1, "%s(): Requested 0x%x bytes\n", __func__, minsize);
>>  
>> -	spin_lock(&c->erase_completion_lock);
>> -	while(ret == -EAGAIN) {
>> +	while (true) {
>> +		spin_lock(&c->erase_completion_lock);
>>  		ret = jffs2_do_reserve_space(c, minsize, len, sumsize);
>>  		if (ret) {
>>  			jffs2_dbg(1, "%s(): looping, ret is %d\n",
>>  				  __func__, ret);
>>  		}
>> +		spin_unlock(&c->erase_completion_lock);
>> +
>> +		if (ret == -EAGAIN)
>> +			cond_resched();
>> +		else
>> +			break;
>>  	}
>> -	spin_unlock(&c->erase_completion_lock);
>>  	if (!ret)
>>  		ret = jffs2_prealloc_raw_node_refs(c, c->nextblock, 1);
> 
> Looks OK.  We can do this:
> 

Yeah, thanks for the cleanup.

> --- a/fs/jffs2/nodemgmt.c~jffs2-avoid-soft-lockup-in-jffs2_reserve_space_gc-fix
> +++ a/fs/jffs2/nodemgmt.c
> @@ -211,7 +211,7 @@ out:
>  int jffs2_reserve_space_gc(struct jffs2_sb_info *c, uint32_t minsize,
>  			   uint32_t *len, uint32_t sumsize)
>  {
> -	int ret = -EAGAIN;
> +	int ret;
>  	minsize = PAD(minsize);
>  
>  	jffs2_dbg(1, "%s(): Requested 0x%x bytes\n", __func__, minsize);
> _

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