Re: [PATCH v6 8/9] PCI: endpoint: Add PCI Endpoint function driver for MHI bus

[Bjorn Helgaas]

[+cc Yang Li, sorry I didn't notice your patch earlier:
https://lore.kernel.org/r/20230607093514.104012-1-yang.lee@xxxxxxxxxxxxxxxxx]

I think we can squash this into the original commit since it hasn't
gone upstream yet.  Also note that removing the dev_err() apparently
makes "dev" unused, so we'd have to remove that as well, based on this
report [2].

[2] https://lore.kernel.org/r/202306080418.i64hTj5T-lkp@xxxxxxxxx

On Wed, Jun 07, 2023 at 03:49:25PM -0500, Bjorn Helgaas wrote:
> On Fri, Jun 02, 2023 at 05:17:55PM +0530, Manivannan Sadhasivam wrote:
> > Add PCI Endpoint driver for the Qualcomm MHI (Modem Host Interface) bus.
> > The driver implements the MHI function over PCI in the endpoint device
> > such as SDX55 modem. The MHI endpoint function driver acts as a
> > controller driver for the MHI Endpoint stack and carries out all PCI
> > related activities like mapping the host memory using iATU, triggering
> > MSIs etc...
> > ...
> 
> > +static int pci_epf_mhi_bind(struct pci_epf *epf)
> > +{
> > ...
> 
> > +	ret = platform_get_irq_byname(pdev, "doorbell");
> > +	if (ret < 0) {
> > +		dev_err(dev, "Failed to get Doorbell IRQ\n");
> 
> This dev_err() causes this new warning from the 0-day robot [1]:
> 
>   drivers/pci/endpoint/functions/pci-epf-mhi.c:362:2-9: line 362 is redundant because platform_get_irq() already prints an error
> 
> Maybe we could drop it?
> 
> Bjorn
> 
> [1] https://lore.kernel.org/all/20230607163937.ZTc-D%25lkp@xxxxxxxxx/