On 20/04/2017 16:28, Marc Gonzalez wrote:
> +static int tango_set_affinity(struct irq_data *data,
> + const struct cpumask *mask, bool force)
> +{
> + return -EINVAL;
> +}
> +
> +static struct irq_chip tango_chip = {
> + .irq_ack = tango_ack,
> + .irq_mask = tango_mask,
> + .irq_unmask = tango_unmask,
> + .irq_set_affinity = tango_set_affinity,
> + .irq_compose_msi_msg = tango_compose_msi_msg,
> +};
Hmmm... I'm wondering why .irq_set_affinity is required.
static int setup_affinity(struct irq_desc *desc, struct cpumask *mask)
first calls __irq_can_set_affinity() to check whether
desc->irq_data.chip->irq_set_affinity) exists.
then calls irq_do_set_affinity(&desc->irq_data, mask, false);
which calls chip->irq_set_affinity(data, mask, force);
= msi_domain_set_affinity()
which calls parent->chip->irq_set_affinity() unconditionally.
Would it make sense to test that the callback is implemented
before calling it?
[ 0.723895] Unable to handle kernel NULL pointer dereference at virtual address 00000000
...
[ 1.135809] [<c0160eb4>] (msi_domain_set_affinity) from [<c015a864>] (irq_do_set_affinity+0x18/0x48)
[ 1.144990] [<c015a864>] (irq_do_set_affinity) from [<c015a918>] (setup_affinity+0x84/0xd4)
[ 1.153384] [<c015a918>] (setup_affinity) from [<c015b20c>] (__setup_irq+0x40c/0x5d4)
[ 1.161254] [<c015b20c>] (__setup_irq) from [<c015b57c>] (request_threaded_irq+0xe4/0x184)
[ 1.169569] [<c015b57c>] (request_threaded_irq) from [<c03102e0>] (aer_probe+0x9c/0x218)
[ 1.177704] [<c03102e0>] (aer_probe) from [<c030e4bc>] (pcie_port_probe_service+0x34/0x70)
[ 1.186017] [<c030e4bc>] (pcie_port_probe_service) from [<c0351cd0>] (really_probe+0x1c4/0x250)
[ 1.194763] [<c0351cd0>] (really_probe) from [<c0351ec8>] (__device_attach_driver+0xa4/0xe0)
[ 1.203245] [<c0351ec8>] (__device_attach_driver) from [<c0350274>] (bus_for_each_drv+0x60/0x94)
[ 1.212076] [<c0350274>] (bus_for_each_drv) from [<c0351abc>] (__device_attach+0x9c/0xdc)
[ 1.220296] [<c0351abc>] (__device_attach) from [<c0351ff0>] (device_initial_probe+0xc/0x10)
[ 1.228777] [<c0351ff0>] (device_initial_probe) from [<c0351090>] (bus_probe_device+0x84/0x8c)
[ 1.237433] [<c0351090>] (bus_probe_device) from [<c034f484>] (device_add+0x3cc/0x548)
[ 1.245390] [<c034f484>] (device_add) from [<c034f614>] (device_register+0x14/0x18)
[ 1.253086] [<c034f614>] (device_register) from [<c030e8b8>] (pcie_port_device_register+0x3b0/0x450)
[ 1.262267] [<c030e8b8>] (pcie_port_device_register) from [<c030ecfc>] (pcie_portdrv_probe+0x2c/0x50)
[ 1.271539] [<c030ecfc>] (pcie_portdrv_probe) from [<c0302ba8>] (pci_device_probe+0x7c/0xc8)
[ 1.280022] [<c0302ba8>] (pci_device_probe) from [<c0351c84>] (really_probe+0x178/0x250)
[ 1.288154] [<c0351c84>] (really_probe) from [<c0351ec8>] (__device_attach_driver+0xa4/0xe0)
[ 1.296635] [<c0351ec8>] (__device_attach_driver) from [<c0350274>] (bus_for_each_drv+0x60/0x94)
[ 1.305465] [<c0350274>] (bus_for_each_drv) from [<c0351abc>] (__device_attach+0x9c/0xdc)
[ 1.313684] [<c0351abc>] (__device_attach) from [<c0351b08>] (device_attach+0xc/0x10)
[ 1.321559] [<c0351b08>] (device_attach) from [<c02f9a20>] (pci_bus_add_device+0x44/0x90)
[ 1.329778] [<c02f9a20>] (pci_bus_add_device) from [<c02f9aa8>] (pci_bus_add_devices+0x3c/0x80)
[ 1.338523] [<c02f9aa8>] (pci_bus_add_devices) from [<c0312dfc>] (pci_host_common_probe+0x100/0x314)
[ 1.347703] [<c0312dfc>] (pci_host_common_probe) from [<c0313550>] (tango_pcie_probe+0x138/0x340)
[ 1.356624] [<c0313550>] (tango_pcie_probe) from [<c03532c4>] (platform_drv_probe+0x34/0x6c)
