From: ml@communistcode.co.uk (Jack Mitchell)
To: linux-arm-kernel@lists.infradead.org
Subject: [BUG] kernel oops in pin_request
Date: Mon, 04 Feb 2013 11:36:36 +0000 [thread overview]
Message-ID: <510F9D44.2000700@communistcode.co.uk> (raw)
I am developing a driver located at [1]. The driver has two devices on a
single SPI bus. When the devices are probed the pins for the SPI bus get
requested twice, as so:
pinctrl = devm_pinctrl_get_select_default(&spi->dev);
if (IS_ERR(pinctrl))
{
pr_debug("%s: Setting pins failed: %d\n", __func__, (s32) pinctrl);
}
The driver is DT only, and as such gets it's pins and setup from the DT
[2]. When the second request happens I get the following output the
kernel log:
Jan 25 15:04:54 beaglebone user.err kernel: [ 67.319188]
pinctrl-single 44e10800.pinmux: pin 44e1099c already requested by
48030000.spi; cannot claim for spi2.1
Jan 25 15:04:54 beaglebone user.err kernel: [ 67.330496]
pinctrl-single 44e10800.pinmux: pin-103 (spi2.1) status -22
Jan 25 15:04:54 beaglebone user.err kernel: [ 67.337555]
pinctrl-single 44e10800.pinmux: could not request pin 103 on device
pinctrl-single
Which I guess is ok as the first probe already setup the pins,
everything then works as it should. Now, when I come to unload + reload
the module I get an oops regarding the strmcmp() in pin_request:
Jan 25 15:13:25 beaglebone user.debug kernel: [ 578.600746]
r0005spi_probe: SPI Bus 2 probed
Jan 25 15:13:25 beaglebone user.alert kernel: [ 578.605991] Unable to
handle kernel NULL pointer dereference at virtual address 00000000
Jan 25 15:13:25 beaglebone user.alert kernel: [ 578.614641] pgd = cf570000
Jan 25 15:13:25 beaglebone user.alert kernel: [ 578.617578] [00000000]
*pgd=8d93a831, *pte=00000000, *ppte=00000000
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.624347] Internal
error: Oops: 17 [#1] SMP ARM
Jan 25 15:13:25 beaglebone user.warn kernel: [ 578.629303] Modules
linked in: r0005spi(O+) [last unloaded: r0005spi]
Jan 25 15:13:25 beaglebone user.warn kernel: [ 578.636135] CPU: 0
Tainted: G O (3.8.0-rc5-00538-g2431418-dirty #7)
Jan 25 15:13:25 beaglebone user.warn kernel: [ 578.644031] PC is at
strcmp+0x4/0x3c
Jan 25 15:13:25 beaglebone user.warn kernel: [ 578.647807] LR is at
pin_request+0xb0/0x1e8
Jan 25 15:13:25 beaglebone user.warn kernel: [ 578.652224] pc :
[<c0295ac0>] lr : [<c02a94fc>] psr: a0000013
Jan 25 15:13:25 beaglebone user.warn kernel: [ 578.652224] sp :
cf4dfd38 ip : 00000000 fp : ffffffff
Jan 25 15:13:25 beaglebone user.warn kernel: [ 578.664290] r10:
00000000 r9 : 00000000 r8 : 00000059
Jan 25 15:13:25 beaglebone user.warn kernel: [ 578.669792] r7 :
cf33fe00 r6 : c08413f0 r5 : cf0bb680 r4 : cf0a2280
Jan 25 15:13:25 beaglebone user.warn kernel: [ 578.676659] r3 :
00000000 r2 : 00000000 r1 : cf33fe00 r0 : 00000000
Jan 25 15:13:25 beaglebone user.warn kernel: [ 578.683531] Flags: NzCv
IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
Jan 25 15:13:25 beaglebone user.warn kernel: [ 578.691038] Control:
10c5387d Table: 8f570019 DAC: 00000015
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.697087] Process
insmod (pid: 566, stack limit = 0xcf4de240)
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.703318] Stack:
(0xcf4dfd38 to 0xcf4e0000)
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.708307] fd20:
cf0a2280 00000059
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.717039] fd40:
cf33fe00 00000000 cf0a2280 cf52ebc0 c0af6010 c08413f0 00000000 00000000
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.725735] fd60:
00000001 c02a99d8 cf756e90 00000003 cf4dfda0 cf52ebc0 cf52ed0c cf756cc0
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.734427] fd80:
c0af6010 cf52ed00 bf005650 c02a8018 cf5dfac0 c08411c4 cf756cc0 cf52ed00
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.743121] fda0:
c0af6010 c02a8074 cf756c00 cf756cc0 cf335600 bf005218 cf335600 00000000
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.751862] fdc0:
cf335600 bf005b8c bf005b8c c031e1c0 00000001 c037e678 c037e660 c031dfac
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.764322] fde0:
bf005b8c cf335600 cf335600 cf335634 bf005b8c c031e228 00000000 cf4dfe08
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.773168] fe00:
bf005b8c c031c53c cf0b5478 cf334880 bf005b8c bf005b8c c0852258 cf4155c0
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.781877] fe20:
00000000 c031d5c4 bf00594c cf0a2488 bf005b8c cf4dff58 00000000 bf005d3c
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.790570] fe40:
00000001 c031e71c 00000000 bf005d30 cf4dff58 00000000 bf005d3c 00000001
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.799262] fe60:
bf005650 c0008878 bf005650 00000000 00000001 bf005d30 bf005d30 cf4dff58
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.817450] fe80:
00000000 bf005d3c 00000001 cf6e9880 bf005d78 c008b928 bf005d3c 00007fff
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.826624] fea0:
c02a5ed0 00000053 c0875738 0000001c 00000000 c0088aac c07fab0c bf005e84
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.835756] fec0:
c0534e14 d09f6970 cf4dfee4 00022008 20000013 c0753164 cf4dff14 c0529a18
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.844875] fee0:
d09f9000 b6fca000 00000751 00000000 00000000 00000000 00000000 00000000
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.853984] ff00:
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.863087] ff20:
00000000 00000000 000000d2 b6fc0000 0000a7d1 00022008 00000080 c000e364
Jan 25 15:13:25 beaglebone user.debug kernel: [ 578.600746]
r0005spi_probe: SPI Bus 2 probed
Jan 25 15:13:25 beaglebone user.alert kernel: [ 578.605991] Unable to
handle kernel NULL pointer dereference at virtual address 00000000
Jan 25 15:13:25 beaglebone user.alert kernel: [ 578.614641] pgd = cf570000
Jan 25 15:13:25 beaglebone user.alert kernel: [ 578.617578] [00000000]
*pgd=8d93a831, *pte=00000000, *ppte=00000000
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.624347] Internal
error: Oops: 17 [#1] SMP ARM
Jan 25 15:13:25 beaglebone user.warn kernel: [ 578.629303] Modules
linked in: r0005spi(O+) [last unloaded: r0005spi]
Jan 25 15:13:25 beaglebone user.warn kernel: [ 578.636135] CPU: 0
Tainted: G O (3.8.0-rc5-00538-g2431418-dirty #7)
Jan 25 15:13:25 beaglebone user.warn kernel: [ 578.644031] PC is at
strcmp+0x4/0x3c
Jan 25 15:13:25 beaglebone user.warn kernel: [ 578.647807] LR is at
pin_request+0xb0/0x1e8
Jan 25 15:13:25 beaglebone user.warn kernel: [ 578.652224] pc :
[<c0295ac0>] lr : [<c02a94fc>] psr: a0000013
Jan 25 15:13:25 beaglebone user.warn kernel: [ 578.652224] sp :
cf4dfd38 ip : 00000000 fp : ffffffff
Jan 25 15:13:25 beaglebone user.warn kernel: [ 578.664290] r10:
00000000 r9 : 00000000 r8 : 00000059
Jan 25 15:13:25 beaglebone user.warn kernel: [ 578.669792] r7 :
cf33fe00 r6 : c08413f0 r5 : cf0bb680 r4 : cf0a2280
Jan 25 15:13:25 beaglebone user.warn kernel: [ 578.676659] r3 :
00000000 r2 : 00000000 r1 : cf33fe00 r0 : 00000000
Jan 25 15:13:25 beaglebone user.warn kernel: [ 578.683531] Flags: NzCv
IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
Jan 25 15:13:25 beaglebone user.warn kernel: [ 578.691038] Control:
10c5387d Table: 8f570019 DAC: 00000015
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.697087] Process
insmod (pid: 566, stack limit = 0xcf4de240)
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.703318] Stack:
(0xcf4dfd38 to 0xcf4e0000)
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.708307] fd20:
cf0a2280 00000059
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.717039] fd40:
cf33fe00 00000000 cf0a2280 cf52ebc0 c0af6010 c08413f0 00000000 00000000
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.725735] fd60:
00000001 c02a99d8 cf756e90 00000003 cf4dfda0 cf52ebc0 cf52ed0c cf756cc0
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.734427] fd80:
c0af6010 cf52ed00 bf005650 c02a8018 cf5dfac0 c08411c4 cf756cc0 cf52ed00
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.743121] fda0:
c0af6010 c02a8074 cf756c00 cf756cc0 cf335600 bf005218 cf335600 00000000
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.751862] fdc0:
cf335600 bf005b8c bf005b8c c031e1c0 00000001 c037e678 c037e660 c031dfac
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.764322] fde0:
bf005b8c cf335600 cf335600 cf335634 bf005b8c c031e228 00000000 cf4dfe08
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.773168] fe00:
bf005b8c c031c53c cf0b5478 cf334880 bf005b8c bf005b8c c0852258 cf4155c0
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.781877] fe20:
00000000 c031d5c4 bf00594c cf0a2488 bf005b8c cf4dff58 00000000 bf005d3c
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.790570] fe40:
00000001 c031e71c 00000000 bf005d30 cf4dff58 00000000 bf005d3c 00000001
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.799262] fe60:
bf005650 c0008878 bf005650 00000000 00000001 bf005d30 bf005d30 cf4dff58
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.817450] fe80:
00000000 bf005d3c 00000001 cf6e9880 bf005d78 c008b928 bf005d3c 00007fff
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.826624] fea0:
c02a5ed0 00000053 c0875738 0000001c 00000000 c0088aac c07fab0c bf005e84
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.835756] fec0:
c0534e14 d09f6970 cf4dfee4 00022008 20000013 c0753164 cf4dff14 c0529a18
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.844875] fee0:
d09f9000 b6fca000 00000751 00000000 00000000 00000000 00000000 00000000
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.853984] ff00:
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.863087] ff20:
00000000 00000000 000000d2 b6fc0000 0000a7d1 00022008 00000080 c000e364
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.872190] ff40:
cf4de000 00000000 00000000 c008bce8 00000002 c0529780 d09ef000 0000a7d1
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.881468] ff60:
d09f6420 d09f62c8 d09f92f8 00000e98 00001218 bf005bc8 0000000f 00000000
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.890834] ff80:
00000022 00000023 0000000e 00000009 00000007 00000000 00000000 00000000
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.899961] ffa0:
00022da8 c000e1e0 00000000 00000000 b6fc0000 0000a7d1 00022008 00022da8
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.909073] ffc0:
00000000 00000000 00022da8 00000080 00022098 0000a7d1 00022008 00000000
Jan 25 15:13:25 beaglebone user.emerg kernel: [ 578.918243] ffe0:
4ff71978 bed65ba8 4ff60790 4fe2e870 60000010 b6fc0000 00000000 00000000
Jan 25 15:13:25 beaglebone user.warn kernel: [ 578.927032] [<c0295ac0>]
(strcmp+0x4/0x3c) from [<c02a94fc>] (pin_request+0xb0/0x1e8)
Jan 25 15:13:25 beaglebone user.warn kernel: [ 578.935371] [<c02a94fc>]
(pin_request+0xb0/0x1e8) from [<c02a99d8>]
(pinmux_enable_setting+0x74/0x1a4)
Jan 25 15:13:25 beaglebone user.warn kernel: [ 578.945369] [<c02a99d8>]
(pinmux_enable_setting+0x74/0x1a4) from [<c02a8018>]
(pinctrl_select_state_locked+0xb8/0xf0)
Jan 25 15:13:25 beaglebone user.warn kernel: [ 578.956637] [<c02a8018>]
(pinctrl_select_state_locked+0xb8/0xf0) from [<c02a8074>]
(pinctrl_select_state+0x24/0x3c)
Jan 25 15:13:25 beaglebone user.warn kernel: [ 578.967743] [<c02a8074>]
(pinctrl_select_state+0x24/0x3c) from [<bf005218>]
(r0005spi_probe+0xfc/0x310 [r0005spi])
Jan 25 15:13:25 beaglebone user.warn kernel: [ 578.978751] [<bf005218>]
(r0005spi_probe+0xfc/0x310 [r0005spi]) from [<c037e678>]
(spi_drv_probe+0x18/0x1c)
Jan 25 15:13:25 beaglebone user.warn kernel: [ 578.989093] [<c037e678>]
(spi_drv_probe+0x18/0x1c) from [<c031dfac>]
(driver_probe_device+0x11c/0x330)
Jan 25 15:13:25 beaglebone user.warn kernel: [ 578.998970] [<c031dfac>]
(driver_probe_device+0x11c/0x330) from [<c031e228>]
(__driver_attach+0x68/0x8c)
Jan 25 15:13:25 beaglebone user.warn kernel: [ 579.009125] [<c031e228>]
(__driver_attach+0x68/0x8c) from [<c031c53c>] (bus_for_each_dev+0x48/0x80)
Jan 25 15:13:25 beaglebone user.warn kernel: [ 579.018774] [<c031c53c>]
(bus_for_each_dev+0x48/0x80) from [<c031d5c4>] (bus_add_driver+0xf0/0x248)
Jan 25 15:13:25 beaglebone user.warn kernel: [ 579.028379] [<c031d5c4>]
(bus_add_driver+0xf0/0x248) from [<c031e71c>] (driver_register+0x9c/0x12c)
Jan 25 15:13:25 beaglebone user.warn kernel: [ 579.037982] [<c031e71c>]
(driver_register+0x9c/0x12c) from [<c0008878>] (do_one_initcall+0x90/0x160)
Jan 25 15:13:25 beaglebone user.warn kernel: [ 579.047681] [<c0008878>]
(do_one_initcall+0x90/0x160) from [<c008b928>] (load_module+0x1b64/0x1e28)
Jan 25 15:13:25 beaglebone user.warn kernel: [ 579.057284] [<c008b928>]
(load_module+0x1b64/0x1e28) from [<c008bce8>] (sys_init_module+0xfc/0x11c)
Jan 25 15:13:25 beaglebone user.warn kernel: [ 579.066891] [<c008bce8>]
(sys_init_module+0xfc/0x11c) from [<c000e1e0>] (ret_fast_syscall+0x0/0x30)
The pin_request portion of that driver where the traceback points to is
as so:
dev_dbg(pctldev->dev, "request pin %d (%s) for %s\n",
pin, desc->name, owner);
if (gpio_range) {
/* There's no need to support multiple GPIO requests */
if (desc->gpio_owner) {
dev_err(pctldev->dev,
"pin %s already requested by %s; cannot claim for %s\n",
desc->name, desc->gpio_owner, owner);
goto out;
}
desc->gpio_owner = owner;
} else {
if (desc->mux_usecount && strcmp(desc->mux_owner, owner)) {
dev_err(pctldev->dev,
"pin %s already requested by %s; cannot claim for %s\n",
desc->name, desc->mux_owner, owner);
goto out;
}
desc->mux_usecount++;
if (desc->mux_usecount > 1)
return 0;
desc->mux_owner = owner;
}
From what I can gather that means that desc->mux_owner or owner must be
an invalid pointer. Is this a bug, or am I abusing the interface in some
subtle way?
[1] https://pastee.org/vyaz4
[2] https://pastee.org/6e2nt
Regards,
Jack.
--
Jack Mitchell (jack at embed.me.uk)
Embedded Systems Engineer
http://www.embed.me.uk
--
next reply other threads:[~2013-02-04 11:36 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-04 11:36 Jack Mitchell [this message]
2013-02-04 12:10 ` [BUG] kernel oops in pin_request Jack Mitchell
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