| Message ID | 1441385411-7624-3-git-send-email-marc.zyngier@arm.com |
|---|---|
| State | Accepted |
| Headers | show |
On Fri, Sep 04, 2015 at 05:50:09PM +0100, Marc Zyngier wrote: > When pci-host-generic looks for the probe-only property, it seems > to trust the DT to be correctly written, and assumes that there > is a parameter to the property. > > Unfortunately, this is not always the case, and some firmware expose > this property naked. The driver ends up making a decision based on > whatever the property pointer points to, which is likely to be junk. > > Switch to the common of_pci.c implementation that doesn't suffer > from this problem. > > Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> > --- > drivers/pci/host/pci-host-generic.c | 9 +-------- > 1 file changed, 1 insertion(+), 8 deletions(-) > > diff --git a/drivers/pci/host/pci-host-generic.c b/drivers/pci/host/pci-host-generic.c > index 265dd25..224303d 100644 > --- a/drivers/pci/host/pci-host-generic.c > +++ b/drivers/pci/host/pci-host-generic.c > @@ -210,7 +210,6 @@ static int gen_pci_probe(struct platform_device *pdev) > int err; > const char *type; > const struct of_device_id *of_id; > - const int *prop; > struct device *dev = &pdev->dev; > struct device_node *np = dev->of_node; > struct gen_pci *pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL); > @@ -225,13 +224,7 @@ static int gen_pci_probe(struct platform_device *pdev) > return -EINVAL; > } > > - prop = of_get_property(of_chosen, "linux,pci-probe-only", NULL); > - if (prop) { > - if (*prop) > - pci_add_flags(PCI_PROBE_ONLY); > - else > - pci_clear_flags(PCI_PROBE_ONLY); > - } > + of_pci_check_probe_only(); Looks good to me: Acked-by: Will Deacon <will.deacon@arm.com> Thanks, Marc. Will -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/pci/host/pci-host-generic.c b/drivers/pci/host/pci-host-generic.c index 265dd25..224303d 100644 --- a/drivers/pci/host/pci-host-generic.c +++ b/drivers/pci/host/pci-host-generic.c @@ -210,7 +210,6 @@ static int gen_pci_probe(struct platform_device *pdev) int err; const char *type; const struct of_device_id *of_id; - const int *prop; struct device *dev = &pdev->dev; struct device_node *np = dev->of_node; struct gen_pci *pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL); @@ -225,13 +224,7 @@ static int gen_pci_probe(struct platform_device *pdev) return -EINVAL; } - prop = of_get_property(of_chosen, "linux,pci-probe-only", NULL); - if (prop) { - if (*prop) - pci_add_flags(PCI_PROBE_ONLY); - else - pci_clear_flags(PCI_PROBE_ONLY); - } + of_pci_check_probe_only(); of_id = of_match_node(gen_pci_of_match, np); pci->cfg.ops = of_id->data;
When pci-host-generic looks for the probe-only property, it seems to trust the DT to be correctly written, and assumes that there is a parameter to the property. Unfortunately, this is not always the case, and some firmware expose this property naked. The driver ends up making a decision based on whatever the property pointer points to, which is likely to be junk. Switch to the common of_pci.c implementation that doesn't suffer from this problem. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> --- drivers/pci/host/pci-host-generic.c | 9 +-------- 1 file changed, 1 insertion(+), 8 deletions(-)