Re: driver skip pci_set_master, fix it? No.

[Bjorn Helgaas]

[+cc Ben, linux-pci]

On Tue, Apr 8, 2014 at 10:34 AM, Mark Lord <mlord@xxxxxxxxx> wrote:
> I am working a couple of drivers for chips that perform extensive bus-mastering ops.
> These including full SRIOV support, and allow assigning virtual functions to virtual machines, etc.
>
> One thing the driver (still in development) does for safety,
> is defer the call to pci_set_master() until *after* it has mapped
> the MMIO space of the chips, so it can reset/flush the DMA engines
> before giving them permission to scribble over host RAM.
>
> But a recent patch to the kernel has removed this from the driver's control.
> The core PCI now does pci_set_master() immediately on pci_enable_device().

I assume you're talking about the one added by cf3e1feba7f9 ("PCI:
Workaround missing pci_set_master in pci drivers"), but as far as I
can tell, it only calls pci_set_master() for *bridge* devices.  What
am I missing?  Is pci_set_master() being called for your endpoint?
What path is that?

Bjorn
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/