From: Thomas Gleixner <tglx@linutronix.de>
To: John Garry <john.garry@huawei.com>,
gregkh@linuxfoundation.org, rafael@kernel.org,
martin.petersen@oracle.com, jejb@linux.ibm.com
Cc: linuxarm@huawei.com, linux-scsi@vger.kernel.org,
linux-kernel@vger.kernel.org, maz@kernel.org
Subject: Re: [PATCH v2 1/3] genirq/affinity: Add irq_update_affinity_desc()
Date: Wed, 18 Nov 2020 21:38:20 +0100 [thread overview]
Message-ID: <874klmqu2r.fsf@nanos.tec.linutronix.de> (raw)
In-Reply-To: <78356caa-57a0-b807-fe52-8f12d36c1789@huawei.com>
John,
On Wed, Nov 18 2020 at 11:34, John Garry wrote:
>> +/**
>> + * irq_update_affinity_desc - Update affinity management for an interrupt
>> + * @irq: The interrupt number to update
>> + * @affinity: Pointer to the affinity descriptor
>> + *
>> + * This interface can be used to configure the affinity management of
>> + * interrupts which have been allocated already.
>> + */
>> +int irq_update_affinity_desc(unsigned int irq,
>> + struct irq_affinity_desc *affinity)
>
> Just a note on the return value, in the only current callsite -
> platform_get_irqs_affinity() - we don't check the return value and
> propagate the error. This is because we don't want to fail the interrupt
> init just because of problems updating the affinity mask. So I could
> print a message to inform the user of error (at the callsite).
Well, not sure about that. During init on a platform which does not have
the issues with reservation mode there failure cases are:
1) Interrupt does not exist. Definitely a full fail
2) Interrupt is already started up. Not a good idea on init() and
a clear fail.
3) Interrupt has already been switched to managed. Double init is not
really a good sign either.
>> + /* Requires the interrupt to be shut down */
>> + if (irqd_is_started(&desc->irq_data))
>
> We're missing the unlock here, right?
Duh yes.
>> + return -EBUSY;
>> +
>> + /* Interrupts which are already managed cannot be modified */
>> + if (irqd_is_managed(&desc->irq_data))
>
> And here, and I figure that this should be irqd_affinity_is_managed()
More duh :)
I assume you send a fixed variant of this.
Thanks,
tglx
next prev parent reply other threads:[~2020-11-18 20:38 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-28 12:33 [PATCH v2 0/3] Support managed interrupts for platform devices John Garry
2020-10-28 12:33 ` [PATCH v2 1/3] genirq/affinity: Add irq_update_affinity_desc() John Garry
2020-10-28 18:22 ` Thomas Gleixner
2020-11-02 17:32 ` John Garry
2020-11-02 20:35 ` Thomas Gleixner
2020-11-17 21:28 ` Thomas Gleixner
2020-11-18 11:34 ` John Garry
2020-11-18 20:38 ` Thomas Gleixner [this message]
2020-11-19 9:31 ` John Garry
2020-11-19 18:09 ` Thomas Gleixner
2020-11-19 19:56 ` John Garry
2020-11-19 21:03 ` Thomas Gleixner
2020-11-20 11:52 ` John Garry
2020-11-22 13:38 ` Marc Zyngier
2020-11-23 12:54 ` John Garry
2020-11-23 13:26 ` Marc Zyngier
2020-11-23 15:45 ` John Garry
2020-11-24 16:51 ` Marc Zyngier
2020-11-24 17:38 ` John Garry
2020-11-25 18:35 ` Marc Zyngier
2020-11-26 10:47 ` John Garry
2020-11-26 11:08 ` Marc Zyngier
2020-11-26 11:29 ` John Garry
2020-11-26 16:52 ` John Garry
2020-11-27 9:57 ` Marc Zyngier
2020-11-27 12:45 ` John Garry
2020-11-27 12:49 ` Marc Zyngier
2020-10-28 12:33 ` [PATCH v2 2/3] Driver core: platform: Add platform_get_irqs_affinity() John Garry
2020-10-28 12:33 ` [PATCH v2 3/3] scsi: hisi_sas: Expose HW queues for v2 hw John Garry
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