linux-kernel - Re: [PATCH v2 11/20] rpmsg: glink: Fix idr

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Message-ID: <ad77bb2a-cfa2-68af-8a44-a99938aecadd@codeaurora.org>
Date:   Tue, 29 Aug 2017 04:43:47 +0530
From:   Sricharan R <sricharan@...eaurora.org>
To:     Chris Lew <clew@...eaurora.org>, ohad@...ery.com,
        bjorn.andersson@...aro.org, linux-remoteproc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 11/20] rpmsg: glink: Fix idr_lock from mutex to
 spinlock

Hi Chris,

On 8/29/2017 3:21 AM, Chris Lew wrote:
> Hi Sricharan,
> 
> Minor bug in this patch.
> 
> On 8/24/2017 12:21 AM, Sricharan R wrote:
> [..]
>> @@ -829,11 +839,14 @@ static int qcom_glink_rx_open(struct qcom_glink *glink, unsigned int rcid,
>>       struct device_node *node;
>>       int lcid;
>>       int ret;
>> +    unsigned long flags;
>>   +    spin_lock_irqsave(&glink->idr_lock, flags);
>>       idr_for_each_entry(&glink->lcids, channel, lcid) {
>>           if (!strcmp(channel->name, name))
>>               break;
>>       }
>> +    spin_unlock_irqrestore(&glink->idr_lock, flags);
>>         if (!channel) {
>>           channel = qcom_glink_alloc_channel(glink, name);
>> @@ -844,15 +857,15 @@ static int qcom_glink_rx_open(struct qcom_glink *glink, unsigned int rcid,
>>           create_device = true;
>>       }
>>   -    mutex_lock(&glink->idr_lock);
>> +    spin_lock_irqsave(&glink->idr_lock, flags);
>>       ret = idr_alloc(&glink->rcids, channel, rcid, rcid + 1, GFP_KERNEL);
> 
> I think GFP_KERNEL should be changed to GFP_ATOMIC if the mutex is changed to spinlock.
> 

 ha, thanks for the catch.

Regards,
 Sricharan

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