netdev - Re: [PATCH] net: qcom/emac: claim the irq only when the device is opened

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 20 Jan 2017 15:05:25 -0600
From:   Timur Tabi <timur@...eaurora.org>
To:     Lino Sanfilippo <LinoSanfilippo@....de>,
        David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH] net: qcom/emac: claim the irq only when the device is
 opened

On 01/20/2017 02:44 PM, Lino Sanfilippo wrote:
>
>
> On 18.01.2017 22:42, Timur Tabi wrote:
>> @@ -1029,8 +1017,6 @@ void emac_mac_down(struct emac_adapter *adpt)
>>        */
>>       writel(DIS_INT, adpt->base + EMAC_INT_STATUS);
>>       writel(0, adpt->base + EMAC_INT_MASK);
>> -    synchronize_irq(adpt->irq.irq);
>
> There is no reason to remove the irq synchronization, is it?
> Note that the desriptors are freed after that so we must be sure that
> the irq handler is not running any more.

I'm moving it to stay with the free_irq().

@@ -283,6 +292,9 @@ static int emac_close(struct net_device *netdev)

  	mutex_lock(&adpt->reset_lock);

+	synchronize_irq(adpt->irq.irq);
+	free_irq(adpt->irq.irq, &adpt->irq);
+

However, I'll admit that I don't know why we call synchronize_irq() at all.

-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm
Technologies, Inc.  Qualcomm Technologies, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.