linux-kernel - Re: [PATCH] PCI: Generate uppercase hex for modalias var in uevent

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Date:	Fri, 9 Jan 2015 19:08:55 +0100
From:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	linux-pci@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] PCI: Generate uppercase hex for modalias var in uevent

Shouldnt this also be backported to stable as Commit 89ec3dcf17fd
("PCI: Generate uppercase hex for modalias  interface class")?


Regards!


On Fri, Jan 9, 2015 at 6:27 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> On Tue, Dec 02, 2014 at 05:35:04PM +0100, Ricardo Ribalda Delgado wrote:
>> Some implementations of modprobe fail to load the driver for a PCI device
>> automatically because the "interface" part of the modalias from the kernel
>> is lowercase, and the modalias from file2alias is uppercase.
>>
>> The "interface" is the low-order byte of the Class Code, defined in PCI
>> r3.0, Appendix D.  Most interface types defined in the spec do not use
>> alpha characters, so they won't be affected.  For example, 00h, 01h, 10h,
>> 20h, etc. are unaffected.
>>
>> Print the "interface" byte of the Class Code in uppercase hex, as we
>> already do for the Vendor ID, Device ID, Class, etc.
>>
>> Commit 89ec3dcf17fd ("PCI: Generate uppercase hex for modalias
>> interface class") fixed only half of the problem. Some udev
>> implementations relays on the uevent file and not in the modalias file.
>>
>> CC: Bjorn Helgaas <bhelgaas@...gle.com>
>> CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>> Fixes: d1ded203adf1 ("PCI: add MODALIAS to hotplug event for pci devices")
>> Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
>
> Applied with Greg's ack to pci/enumeration for v3.20, thanks!
>
>> ---
>>
>> Modified line is >80 char, but I believe that it is better than breaking
>> the string or indent it bad.
>>
>>  drivers/pci/pci-driver.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
>> index 2b3c894..b720e78 100644
>> --- a/drivers/pci/pci-driver.c
>> +++ b/drivers/pci/pci-driver.c
>> @@ -1389,7 +1389,7 @@ static int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
>>       if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev)))
>>               return -ENOMEM;
>>
>> -     if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x",
>> +     if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X",
>>                          pdev->vendor, pdev->device,
>>                          pdev->subsystem_vendor, pdev->subsystem_device,
>>                          (u8)(pdev->class >> 16), (u8)(pdev->class >> 8),
>> --
>> 2.1.3
>>



-- 
Ricardo Ribalda
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