Starting with commit 3da5278727a895d49a601f67fd49dffa0b80f9a5 (of/irq: Rework of_irq_count()) the following warning is triggered on octeon cn3xxx: [ 0.887281] WARNING: CPU: 0 PID: 1 at drivers/of/platform.c:171 of_device_alloc+0x228/0x230() [ 0.895642] Modules linked in: [ 0.898689] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.14.0-rc7-00012-g9ae51f2-dirty #41 [ 0.906860] Stack : c8b439581166d96e ffffffff816b0000 0000000040808000 ffffffff81185ddc [ 0.906860] 0000000000000000 0000000000000000 0000000000000000 000000000000000b [ 0.906860] 000000000000000a 000000000000000a 0000000000000000 0000000000000000 [ 0.906860] ffffffff81740000 ffffffff81720000 ffffffff81615900 ffffffff816b0177 [ 0.906860] ffffffff81727d10 800000041f868fb0 0000000000000001 0000000000000000 [ 0.906860] 0000000000000000 0000000000000038 0000000000000001 ffffffff81568484 [ 0.906860] 800000041f86faa8 ffffffff81145ddc 0000000000000000 ffffffff811873f4 [ 0.906860] 800000041f868b88 800000041f86f9c0 0000000000000000 ffffffff81569c9c [ 0.906860] 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 0.906860] 0000000000000000 ffffffff811205e0 0000000000000000 0000000000000000 [ 0.906860] ... [ 0.971695] Call Trace: [ 0.974139] [<ffffffff811205e0>] show_stack+0x68/0x80 [ 0.979183] [<ffffffff81569c9c>] dump_stack+0x8c/0xe0 [ 0.984196] [<ffffffff81145efc>] warn_slowpath_common+0x84/0xb8 [ 0.990110] [<ffffffff81436888>] of_device_alloc+0x228/0x230 [ 0.995726] [<ffffffff814368d8>] of_platform_device_create_pdata+0x48/0xd0 [ 1.002593] [<ffffffff81436a94>] of_platform_bus_create+0x134/0x1e8 [ 1.008837] [<ffffffff81436af8>] of_platform_bus_create+0x198/0x1e8 [ 1.015064] [<ffffffff81436cc4>] of_platform_bus_probe+0xa4/0x100 [ 1.021149] [<ffffffff81100570>] do_one_initcall+0xd8/0x128 [ 1.026701] [<ffffffff816e2a10>] kernel_init_freeable+0x144/0x210 [ 1.032753] [<ffffffff81564bc4>] kernel_init+0x14/0x110 [ 1.037973] [<ffffffff8111bb44>] ret_from_kernel_thread+0x14/0x1c With this commit the kernel starts mapping the interrupts listed for gpio-controller node. irq_domain_ops for CIU (octeon_irq_ciu_map and octeon_irq_ciu_xlat) refuse to handle the GPIO lines (returning -EINVAL) and this is causing above warning in of_device_alloc(). Modify irq_domain_ops for CIU and CIU2 to "gracefully handle" GPIO lines (neither return error code nor call octeon_irq_set_ciu_mapping for it). This should avoid the warning. (As before the real setup for GPIO lines will happen using irq_domain_ops of gpio-controller.) This patch is based on Wei's patch v2 (see http://marc.info/?l=linux-mips&m=139511814813247). Reported-by: Yang Wei <wei.yang@xxxxxxxxxxxxx> Cc: David Daney <david.daney@xxxxxxxxxxxxxxxxxx> Signed-off-by: Andreas Herrmann <andreas.herrmann@xxxxxxxxxxxxxxxxxx> --- arch/mips/cavium-octeon/octeon-irq.c | 22 ++++++++++++---------- 1 file changed, 12 insertions(+), 10 deletions(-) diff --git a/arch/mips/cavium-octeon/octeon-irq.c b/arch/mips/cavium-octeon/octeon-irq.c index 25fbfae..c2bb4f8 100644 --- a/arch/mips/cavium-octeon/octeon-irq.c +++ b/arch/mips/cavium-octeon/octeon-irq.c @@ -975,10 +975,6 @@ static int octeon_irq_ciu_xlat(struct irq_domain *d, if (ciu > 1 || bit > 63) return -EINVAL; - /* These are the GPIO lines */ - if (ciu == 0 && bit >= 16 && bit < 32) - return -EINVAL; - *out_hwirq = (ciu << 6) | bit; *out_type = 0; @@ -1007,6 +1003,10 @@ static int octeon_irq_ciu_map(struct irq_domain *d, if (!octeon_irq_virq_in_range(virq)) return -EINVAL; + /* Don't map irq if it is reserved for GPIO. */ + if (line == 0 && bit >= 16 && bit <32) + return 0; + if (line > 1 || octeon_irq_ciu_to_irq[line][bit] != 0) return -EINVAL; @@ -1525,10 +1525,6 @@ static int octeon_irq_ciu2_xlat(struct irq_domain *d, ciu = intspec[0]; bit = intspec[1]; - /* Line 7 are the GPIO lines */ - if (ciu > 6 || bit > 63) - return -EINVAL; - *out_hwirq = (ciu << 6) | bit; *out_type = 0; @@ -1570,8 +1566,14 @@ static int octeon_irq_ciu2_map(struct irq_domain *d, if (!octeon_irq_virq_in_range(virq)) return -EINVAL; - /* Line 7 are the GPIO lines */ - if (line > 6 || octeon_irq_ciu_to_irq[line][bit] != 0) + /* + * Don't map irq if it is reserved for GPIO. + * (Line 7 are the GPIO lines.) + */ + if (line == 7) + return 0; + + if (line > 7 || octeon_irq_ciu_to_irq[line][bit] != 0) return -EINVAL; if (octeon_irq_ciu2_is_edge(line, bit)) -- 1.7.9.5
