linux-kernel - Re: [PATCH v7 4/8] PCI/sysfs: Allow userspace to query and set device reset mechanism

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Date:   Wed, 9 Jun 2021 17:36:26 -0500
From:   Shanker R Donthineni <sdonthineni@...dia.com>
To:     Raphael Norwitz <raphael.norwitz@...anix.com>,
        Amey Narkhede <ameynarkhede03@...il.com>
CC:     Bjorn Helgaas <bhelgaas@...gle.com>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kw@...ux.com" <kw@...ux.com>, Sinan Kaya <okaya@...nel.org>,
        Len Brown <lenb@...nel.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>
Subject: Re: [PATCH v7 4/8] PCI/sysfs: Allow userspace to query and set device
 reset mechanism

Hi Raphael,

On 6/9/21 4:57 PM, Raphael Norwitz wrote:
>> +static ssize_t reset_method_show(struct device *dev,
>> +                              struct device_attribute *attr,
>> +                              char *buf)
>> +{
>> +     struct pci_dev *pdev = to_pci_dev(dev);
>> +     ssize_t len = 0;
>> +     int i, prio;
>> +
>> +     for (prio = PCI_RESET_METHODS_NUM; prio; prio--) {
>> +             for (i = 0; i < PCI_RESET_METHODS_NUM; i++) {
>> +                     if (prio == pdev->reset_methods[i]) {
>> +                             len += sysfs_emit_at(buf, len, "%s%s",
>> +                                                  len ? "," : "",
>> +                                                  pci_reset_fn_methods[i].name);
>> +                             break;
>> +                     }
>> +             }
>> +
>> +             if (i == PCI_RESET_METHODS_NUM)
>> +                     break;
>> +     }
>> +
> Don't you still need to ensure you add the newline even if there are no
> reset methods set? If the len is zero why don't we need the newline?
>
> Otherwise looks good.
>

sysfs entry 'reset_method' will not be visible if there are no reset methods.