Re: [PATCH] m68k: Fix WARNING splat in pmac_zilog driver
Hi Finn,
On Sat, Nov 21, 2020 at 12:47 AM Finn Thain wrote:
> On Fri, 20 Nov 2020, Geert Uytterhoeven wrote:
> > On Fri, Nov 20, 2020 at 5:51 AM Finn Thain
> > wrote:
> > > Don't add platform resources that won't be used. This avoids a
> > > recently-added warning from the driver core, that can show up on a
> > > multi-platform kernel when !MACH_IS_MAC.
> > >
> > > [ cut here ]
> > > WARNING: CPU: 0 PID: 0 at drivers/base/platform.c:224
> > > platform_get_irq_optional+0x8e/0xce
> > > 0 is an invalid IRQ number
> > > Modules linked in:
> > > CPU: 0 PID: 0 Comm: swapper Not tainted 5.9.0-multi #1
> > > Stack from 004b3f04:
> > > 004b3f04 00462c2f 00462c2f 004b3f20 0002e128 004754db 004b6ad4
> > > 004b3f4c
> > > 0002e19c 004754f7 00e0 00285ba0 0009 004b3f44
> > >
> > > 004754db 004b3f64 004b3f74 00285ba0 004754f7 00e0 0009
> > > 004754db
> > > 004fdf0c 005269e2 004fdf0c 004b3f88 00285cae 004b6964
> > >
> > > 004fdf0c 004b3fac 0051cc68 004b6964 004b6964 0200
> > >
> > > 0051cc3e 0023c18a 004b3fc0 0051cd8a 004fdf0c 0002 0052b43c
> > > 004b3fc8
> > > Call Trace: [<0002e128>] __warn+0xa6/0xd6
> > > [<0002e19c>] warn_slowpath_fmt+0x44/0x76
> > > [<00285ba0>] platform_get_irq_optional+0x8e/0xce
> > > [<00285ba0>] platform_get_irq_optional+0x8e/0xce
> > > [<00285cae>] platform_get_irq+0x12/0x4c
> > > [<0051cc68>] pmz_init_port+0x2a/0xa6
> > > [<0051cc3e>] pmz_init_port+0x0/0xa6
> > > [<0023c18a>] strlen+0x0/0x22
> > > [<0051cd8a>] pmz_probe+0x34/0x88
> > > [<0051cde6>] pmz_console_init+0x8/0x28
> > > [<00511776>] console_init+0x1e/0x28
> > > [<0005a3bc>] printk+0x0/0x16
> > > [<0050a8a6>] start_kernel+0x368/0x4ce
> > > [<005094f8>] _sinittext+0x4f8/0xc48
> > > random: get_random_bytes called from print_oops_end_marker+0x56/0x80 with
> > > crng_init=0
> > > ---[ end trace 392d8e82eed68d6c ]---
> > >
> > > Cc: Michael Ellerman
> > > Cc: Benjamin Herrenschmidt
> > > Cc: Paul Mackerras
> > > Cc: Joshua Thompson
> > > Cc: Greg Kroah-Hartman
> > > Cc: Jiri Slaby
> > > Cc: sta...@vger.kernel.org # v5.8+
> > > References: commit a85a6c86c25b ("driver core: platform: Clarify that IRQ
> > > 0 is invalid")
> > > Reported-by: Laurent Vivier
> > > Signed-off-by: Finn Thain
> > > ---
> > > The global platform_device structs provide the equivalent of a direct
> > > search of the OpenFirmware tree, for platforms that don't have OF.
> > > The purpose of that search is discussed in the comments in pmac_zilog.c:
> > >
> > > * First, we need to do a direct OF-based probe pass. We
> > > * do that because we want serial console up before the
> > > * macio stuffs calls us back
> > >
> > > The actual platform bus matching takes place later, with a
> > > module_initcall,
> > > following the usual pattern.
> >
> > I think it would be good for this explanation to be part of the
> > actual patch description above.
> >
>
> Thanks for your review.
>
> I take that explanation as read because it was fundamental to the changes
> I made to pmac_zilog.c back in 2009 with commit ec9cbe09899e ("pmac-zilog:
> add platform driver").
That's a long time ago ;-)
I asked because to the casual reader, it's far from obvious why the platform
device use-time is different from the platform device's resources use-time.
> IMO, being that it isn't news, it doesn't belong in the changelog.
> However, I agree that it needs to be documented. How about I add a comment
> to pmac_zilog.c?
Fine for me.
> > > --- a/drivers/tty/serial/pmac_zilog.c
> > > +++ b/drivers/tty/serial/pmac_zilog.c
> > > @@ -1697,18 +1697,17 @@ extern struct platform_device scc_a_pdev,
> > > scc_b_pdev;
> > >
> > > static int __init pmz_init_port(struct uart_pmac_port *uap)
> > > {
> > > - struct resource *r_ports;
> > > - int irq;
> > > + struct resource *r_ports, *r_irq;
> > >
> > > r_ports = platform_get_resource(uap->pdev, IORESOURCE_MEM, 0);
> > > - irq = platform_get_irq(uap->pdev, 0);
> > > - if (!r_ports || irq <= 0)
> > > + r_irq = platform_get_resource(uap->pdev, IORESOURCE_IRQ, 0);
> > > + if (!r_ports || !r_irq)
> > > return -ENODEV;
> > >
> > > uap->port.mapbase = r_ports->start;
> > > uap->port.membase = (unsigned char __iomem *) r_ports->start;
> > > uap->port.iotype = UPIO_MEM;
> > > - uap->port.irq = irq;
> > > + uap->port.irq = r_irq->start;
> > > uap->port.uartclk = ZS_CLOCK;
> > > uap->port.fifosize = 1;
> > > uap->port.ops = _pops;
> >
> > Given the resources are no longer present on !MAC, just doing
> >
> > r_ports = platform_get_resource(uap->pdev, IORESOURCE_MEM, 0);
> > + if (!r_ports)
> > + return -ENODEV;
> > irq = platform_get_irq(uap->pdev, 0);
> >
> > should
Re: [PATCH] m68k: Fix WARNING splat in pmac_zilog driver
On Fri, 20 Nov 2020, Geert Uytterhoeven wrote:
> Hi Finn,
>
> On Fri, Nov 20, 2020 at 5:51 AM Finn Thain wrote:
> > Don't add platform resources that won't be used. This avoids a
> > recently-added warning from the driver core, that can show up on a
> > multi-platform kernel when !MACH_IS_MAC.
> >
> > [ cut here ]
> > WARNING: CPU: 0 PID: 0 at drivers/base/platform.c:224
> > platform_get_irq_optional+0x8e/0xce
> > 0 is an invalid IRQ number
> > Modules linked in:
> > CPU: 0 PID: 0 Comm: swapper Not tainted 5.9.0-multi #1
> > Stack from 004b3f04:
> > 004b3f04 00462c2f 00462c2f 004b3f20 0002e128 004754db 004b6ad4
> > 004b3f4c
> > 0002e19c 004754f7 00e0 00285ba0 0009 004b3f44
> >
> > 004754db 004b3f64 004b3f74 00285ba0 004754f7 00e0 0009
> > 004754db
> > 004fdf0c 005269e2 004fdf0c 004b3f88 00285cae 004b6964
> >
> > 004fdf0c 004b3fac 0051cc68 004b6964 004b6964 0200
> >
> > 0051cc3e 0023c18a 004b3fc0 0051cd8a 004fdf0c 0002 0052b43c
> > 004b3fc8
> > Call Trace: [<0002e128>] __warn+0xa6/0xd6
> > [<0002e19c>] warn_slowpath_fmt+0x44/0x76
> > [<00285ba0>] platform_get_irq_optional+0x8e/0xce
> > [<00285ba0>] platform_get_irq_optional+0x8e/0xce
> > [<00285cae>] platform_get_irq+0x12/0x4c
> > [<0051cc68>] pmz_init_port+0x2a/0xa6
> > [<0051cc3e>] pmz_init_port+0x0/0xa6
> > [<0023c18a>] strlen+0x0/0x22
> > [<0051cd8a>] pmz_probe+0x34/0x88
> > [<0051cde6>] pmz_console_init+0x8/0x28
> > [<00511776>] console_init+0x1e/0x28
> > [<0005a3bc>] printk+0x0/0x16
> > [<0050a8a6>] start_kernel+0x368/0x4ce
> > [<005094f8>] _sinittext+0x4f8/0xc48
> > random: get_random_bytes called from print_oops_end_marker+0x56/0x80 with
> > crng_init=0
> > ---[ end trace 392d8e82eed68d6c ]---
> >
> > Cc: Michael Ellerman
> > Cc: Benjamin Herrenschmidt
> > Cc: Paul Mackerras
> > Cc: Joshua Thompson
> > Cc: Greg Kroah-Hartman
> > Cc: Jiri Slaby
> > Cc: sta...@vger.kernel.org # v5.8+
> > References: commit a85a6c86c25b ("driver core: platform: Clarify that IRQ 0
> > is invalid")
> > Reported-by: Laurent Vivier
> > Signed-off-by: Finn Thain
> > ---
> > The global platform_device structs provide the equivalent of a direct
> > search of the OpenFirmware tree, for platforms that don't have OF.
> > The purpose of that search is discussed in the comments in pmac_zilog.c:
> >
> > * First, we need to do a direct OF-based probe pass. We
> > * do that because we want serial console up before the
> > * macio stuffs calls us back
> >
> > The actual platform bus matching takes place later, with a module_initcall,
> > following the usual pattern.
>
> I think it would be good for this explanation to be part of the
> actual patch description above.
>
Thanks for your review.
I take that explanation as read because it was fundamental to the changes
I made to pmac_zilog.c back in 2009 with commit ec9cbe09899e ("pmac-zilog:
add platform driver").
IMO, being that it isn't news, it doesn't belong in the changelog.
However, I agree that it needs to be documented. How about I add a comment
to pmac_zilog.c?
> > --- a/arch/m68k/mac/config.c
> > +++ b/arch/m68k/mac/config.c
> > @@ -777,16 +777,12 @@ static struct resource scc_b_rsrcs[] = {
> > struct platform_device scc_a_pdev = {
> > .name = "scc",
> > .id = 0,
> > - .num_resources = ARRAY_SIZE(scc_a_rsrcs),
> > - .resource = scc_a_rsrcs,
> > };
> > EXPORT_SYMBOL(scc_a_pdev);
> >
> > struct platform_device scc_b_pdev = {
> > .name = "scc",
> > .id = 1,
> > - .num_resources = ARRAY_SIZE(scc_b_rsrcs),
> > - .resource = scc_b_rsrcs,
> > };
> > EXPORT_SYMBOL(scc_b_pdev);
> >
> > @@ -813,10 +809,15 @@ static void __init mac_identify(void)
> >
> > /* Set up serial port resources for the console initcall. */
> >
> > - scc_a_rsrcs[0].start = (resource_size_t) mac_bi_data.sccbase + 2;
> > - scc_a_rsrcs[0].end = scc_a_rsrcs[0].start;
> > - scc_b_rsrcs[0].start = (resource_size_t) mac_bi_data.sccbase;
> > - scc_b_rsrcs[0].end = scc_b_rsrcs[0].start;
> > + scc_a_rsrcs[0].start = (resource_size_t)mac_bi_data.sccbase + 2;
> > + scc_a_rsrcs[0].end = scc_a_rsrcs[0].start;
> > + scc_a_pdev.num_resources = ARRAY_SIZE(scc_a_rsrcs);
> > + scc_a_pdev.resource = scc_a_rsrcs;
> > +
> > + scc_b_rsrcs[0].start = (resource_size_t)mac_bi_data.sccbase;
> > + scc_b_rsrcs[0].end = scc_b_rsrcs[0].start;
> > + scc_b_pdev.num_resources = ARRAY_SIZE(scc_b_rsrcs);
> > + scc_b_pdev.resource = scc_b_rsrcs;
> >
> > switch (macintosh_config->scc_type) {
> > case MAC_SCC_PSC:
> > diff --git a/drivers/tty/serial/pmac_zilog.c
> > b/drivers/tty/serial/pmac_zilog.c
> > index 96e7aa479961..95abdb305d67
Re: [PATCH] m68k: Fix WARNING splat in pmac_zilog driver
Hi Finn,
On Fri, Nov 20, 2020 at 5:51 AM Finn Thain wrote:
> Don't add platform resources that won't be used. This avoids a
> recently-added warning from the driver core, that can show up on a
> multi-platform kernel when !MACH_IS_MAC.
>
> [ cut here ]
> WARNING: CPU: 0 PID: 0 at drivers/base/platform.c:224
> platform_get_irq_optional+0x8e/0xce
> 0 is an invalid IRQ number
> Modules linked in:
> CPU: 0 PID: 0 Comm: swapper Not tainted 5.9.0-multi #1
> Stack from 004b3f04:
> 004b3f04 00462c2f 00462c2f 004b3f20 0002e128 004754db 004b6ad4
> 004b3f4c
> 0002e19c 004754f7 00e0 00285ba0 0009 004b3f44
>
> 004754db 004b3f64 004b3f74 00285ba0 004754f7 00e0 0009
> 004754db
> 004fdf0c 005269e2 004fdf0c 004b3f88 00285cae 004b6964
>
> 004fdf0c 004b3fac 0051cc68 004b6964 004b6964 0200
>
> 0051cc3e 0023c18a 004b3fc0 0051cd8a 004fdf0c 0002 0052b43c
> 004b3fc8
> Call Trace: [<0002e128>] __warn+0xa6/0xd6
> [<0002e19c>] warn_slowpath_fmt+0x44/0x76
> [<00285ba0>] platform_get_irq_optional+0x8e/0xce
> [<00285ba0>] platform_get_irq_optional+0x8e/0xce
> [<00285cae>] platform_get_irq+0x12/0x4c
> [<0051cc68>] pmz_init_port+0x2a/0xa6
> [<0051cc3e>] pmz_init_port+0x0/0xa6
> [<0023c18a>] strlen+0x0/0x22
> [<0051cd8a>] pmz_probe+0x34/0x88
> [<0051cde6>] pmz_console_init+0x8/0x28
> [<00511776>] console_init+0x1e/0x28
> [<0005a3bc>] printk+0x0/0x16
> [<0050a8a6>] start_kernel+0x368/0x4ce
> [<005094f8>] _sinittext+0x4f8/0xc48
> random: get_random_bytes called from print_oops_end_marker+0x56/0x80 with
> crng_init=0
> ---[ end trace 392d8e82eed68d6c ]---
>
> Cc: Michael Ellerman
> Cc: Benjamin Herrenschmidt
> Cc: Paul Mackerras
> Cc: Joshua Thompson
> Cc: Greg Kroah-Hartman
> Cc: Jiri Slaby
> Cc: sta...@vger.kernel.org # v5.8+
> References: commit a85a6c86c25b ("driver core: platform: Clarify that IRQ 0
> is invalid")
> Reported-by: Laurent Vivier
> Signed-off-by: Finn Thain
> ---
> The global platform_device structs provide the equivalent of a direct
> search of the OpenFirmware tree, for platforms that don't have OF.
> The purpose of that search is discussed in the comments in pmac_zilog.c:
>
> * First, we need to do a direct OF-based probe pass. We
> * do that because we want serial console up before the
> * macio stuffs calls us back
>
> The actual platform bus matching takes place later, with a module_initcall,
> following the usual pattern.
I think it would be good for this explanation to be part of the
actual patch description above.
> --- a/arch/m68k/mac/config.c
> +++ b/arch/m68k/mac/config.c
> @@ -777,16 +777,12 @@ static struct resource scc_b_rsrcs[] = {
> struct platform_device scc_a_pdev = {
> .name = "scc",
> .id = 0,
> - .num_resources = ARRAY_SIZE(scc_a_rsrcs),
> - .resource = scc_a_rsrcs,
> };
> EXPORT_SYMBOL(scc_a_pdev);
>
> struct platform_device scc_b_pdev = {
> .name = "scc",
> .id = 1,
> - .num_resources = ARRAY_SIZE(scc_b_rsrcs),
> - .resource = scc_b_rsrcs,
> };
> EXPORT_SYMBOL(scc_b_pdev);
>
> @@ -813,10 +809,15 @@ static void __init mac_identify(void)
>
> /* Set up serial port resources for the console initcall. */
>
> - scc_a_rsrcs[0].start = (resource_size_t) mac_bi_data.sccbase + 2;
> - scc_a_rsrcs[0].end = scc_a_rsrcs[0].start;
> - scc_b_rsrcs[0].start = (resource_size_t) mac_bi_data.sccbase;
> - scc_b_rsrcs[0].end = scc_b_rsrcs[0].start;
> + scc_a_rsrcs[0].start = (resource_size_t)mac_bi_data.sccbase + 2;
> + scc_a_rsrcs[0].end = scc_a_rsrcs[0].start;
> + scc_a_pdev.num_resources = ARRAY_SIZE(scc_a_rsrcs);
> + scc_a_pdev.resource = scc_a_rsrcs;
> +
> + scc_b_rsrcs[0].start = (resource_size_t)mac_bi_data.sccbase;
> + scc_b_rsrcs[0].end = scc_b_rsrcs[0].start;
> + scc_b_pdev.num_resources = ARRAY_SIZE(scc_b_rsrcs);
> + scc_b_pdev.resource = scc_b_rsrcs;
>
> switch (macintosh_config->scc_type) {
> case MAC_SCC_PSC:
> diff --git a/drivers/tty/serial/pmac_zilog.c b/drivers/tty/serial/pmac_zilog.c
> index 96e7aa479961..95abdb305d67 100644
> --- a/drivers/tty/serial/pmac_zilog.c
> +++ b/drivers/tty/serial/pmac_zilog.c
> @@ -1697,18 +1697,17 @@ extern struct platform_device scc_a_pdev, scc_b_pdev;
>
> static int __init pmz_init_port(struct uart_pmac_port *uap)
> {
> - struct resource *r_ports;
> - int irq;
> + struct resource *r_ports, *r_irq;
>
> r_ports = platform_get_resource(uap->pdev, IORESOURCE_MEM, 0);
> - irq = platform_get_irq(uap->pdev, 0);
> - if (!r_ports || irq <= 0)
> + r_irq = platform_get_resource(uap->pdev, IORESOURCE_IRQ, 0);
> + if (!r_ports || !r_irq)
> return -ENODEV;
>
>
[PATCH] m68k: Fix WARNING splat in pmac_zilog driver
Don't add platform resources that won't be used. This avoids a
recently-added warning from the driver core, that can show up on a
multi-platform kernel when !MACH_IS_MAC.
[ cut here ]
WARNING: CPU: 0 PID: 0 at drivers/base/platform.c:224
platform_get_irq_optional+0x8e/0xce
0 is an invalid IRQ number
Modules linked in:
CPU: 0 PID: 0 Comm: swapper Not tainted 5.9.0-multi #1
Stack from 004b3f04:
004b3f04 00462c2f 00462c2f 004b3f20 0002e128 004754db 004b6ad4 004b3f4c
0002e19c 004754f7 00e0 00285ba0 0009 004b3f44
004754db 004b3f64 004b3f74 00285ba0 004754f7 00e0 0009 004754db
004fdf0c 005269e2 004fdf0c 004b3f88 00285cae 004b6964
004fdf0c 004b3fac 0051cc68 004b6964 004b6964 0200
0051cc3e 0023c18a 004b3fc0 0051cd8a 004fdf0c 0002 0052b43c 004b3fc8
Call Trace: [<0002e128>] __warn+0xa6/0xd6
[<0002e19c>] warn_slowpath_fmt+0x44/0x76
[<00285ba0>] platform_get_irq_optional+0x8e/0xce
[<00285ba0>] platform_get_irq_optional+0x8e/0xce
[<00285cae>] platform_get_irq+0x12/0x4c
[<0051cc68>] pmz_init_port+0x2a/0xa6
[<0051cc3e>] pmz_init_port+0x0/0xa6
[<0023c18a>] strlen+0x0/0x22
[<0051cd8a>] pmz_probe+0x34/0x88
[<0051cde6>] pmz_console_init+0x8/0x28
[<00511776>] console_init+0x1e/0x28
[<0005a3bc>] printk+0x0/0x16
[<0050a8a6>] start_kernel+0x368/0x4ce
[<005094f8>] _sinittext+0x4f8/0xc48
random: get_random_bytes called from print_oops_end_marker+0x56/0x80 with
crng_init=0
---[ end trace 392d8e82eed68d6c ]---
Cc: Michael Ellerman
Cc: Benjamin Herrenschmidt
Cc: Paul Mackerras
Cc: Joshua Thompson
Cc: Greg Kroah-Hartman
Cc: Jiri Slaby
Cc: sta...@vger.kernel.org # v5.8+
References: commit a85a6c86c25b ("driver core: platform: Clarify that IRQ 0 is
invalid")
Reported-by: Laurent Vivier
Signed-off-by: Finn Thain
---
The global platform_device structs provide the equivalent of a direct
search of the OpenFirmware tree, for platforms that don't have OF.
The purpose of that search is discussed in the comments in pmac_zilog.c:
* First, we need to do a direct OF-based probe pass. We
* do that because we want serial console up before the
* macio stuffs calls us back
The actual platform bus matching takes place later, with a module_initcall,
following the usual pattern.
---
arch/m68k/mac/config.c | 17 +
drivers/tty/serial/pmac_zilog.c | 9 -
2 files changed, 13 insertions(+), 13 deletions(-)
diff --git a/arch/m68k/mac/config.c b/arch/m68k/mac/config.c
index 0ac53d87493c..2bea1799b8de 100644
--- a/arch/m68k/mac/config.c
+++ b/arch/m68k/mac/config.c
@@ -777,16 +777,12 @@ static struct resource scc_b_rsrcs[] = {
struct platform_device scc_a_pdev = {
.name = "scc",
.id = 0,
- .num_resources = ARRAY_SIZE(scc_a_rsrcs),
- .resource = scc_a_rsrcs,
};
EXPORT_SYMBOL(scc_a_pdev);
struct platform_device scc_b_pdev = {
.name = "scc",
.id = 1,
- .num_resources = ARRAY_SIZE(scc_b_rsrcs),
- .resource = scc_b_rsrcs,
};
EXPORT_SYMBOL(scc_b_pdev);
@@ -813,10 +809,15 @@ static void __init mac_identify(void)
/* Set up serial port resources for the console initcall. */
- scc_a_rsrcs[0].start = (resource_size_t) mac_bi_data.sccbase + 2;
- scc_a_rsrcs[0].end = scc_a_rsrcs[0].start;
- scc_b_rsrcs[0].start = (resource_size_t) mac_bi_data.sccbase;
- scc_b_rsrcs[0].end = scc_b_rsrcs[0].start;
+ scc_a_rsrcs[0].start = (resource_size_t)mac_bi_data.sccbase + 2;
+ scc_a_rsrcs[0].end = scc_a_rsrcs[0].start;
+ scc_a_pdev.num_resources = ARRAY_SIZE(scc_a_rsrcs);
+ scc_a_pdev.resource = scc_a_rsrcs;
+
+ scc_b_rsrcs[0].start = (resource_size_t)mac_bi_data.sccbase;
+ scc_b_rsrcs[0].end = scc_b_rsrcs[0].start;
+ scc_b_pdev.num_resources = ARRAY_SIZE(scc_b_rsrcs);
+ scc_b_pdev.resource = scc_b_rsrcs;
switch (macintosh_config->scc_type) {
case MAC_SCC_PSC:
diff --git a/drivers/tty/serial/pmac_zilog.c b/drivers/tty/serial/pmac_zilog.c
index 96e7aa479961..95abdb305d67 100644
--- a/drivers/tty/serial/pmac_zilog.c
+++ b/drivers/tty/serial/pmac_zilog.c
@@ -1697,18 +1697,17 @@ extern struct platform_device scc_a_pdev, scc_b_pdev;
static int __init pmz_init_port(struct uart_pmac_port *uap)
{
- struct resource *r_ports;
- int irq;
+ struct resource *r_ports, *r_irq;
r_ports = platform_get_resource(uap->pdev, IORESOURCE_MEM, 0);
- irq = platform_get_irq(uap->pdev, 0);
- if (!r_ports || irq <= 0)
+ r_irq = platform_get_resource(uap->pdev, IORESOURCE_IRQ, 0);
+ if (!r_ports || !r_irq)
return -ENODEV;
uap->port.mapbase = r_ports->start;
uap->port.membase = (unsigned char __iomem *) r_ports->start;
