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Message-Id: <1398854171-5187-1-git-send-email-ricardo.ribalda@gmail.com>
Date: Wed, 30 Apr 2014 12:36:11 +0200
From: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
To: linux-spi@...r.kernel.org, broonie@...nel.org,
linux-kernel@...r.kernel.org
Cc: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Subject: [PATCH] spi: Fix hung task timeout when initialization fails
Since "786235eeba0e1e85e5cbbb9f97d1087ad03dfa21 kthread:
make kthread_create() killable" kthread_run can be killed by the user,
ie, by killing modprobe.
When this happens spi_destroy_queue() fails to cleanout the resources
ending up in a hung process that outputs a error message and avoids
the computer to be halted.
This bug is particulary critical on machines that relay on the spi
subsystem to hold a file system (MTD over SPI).
[ 95.900328] spi_master spi32765: failed to create message pump task
[ 95.900358] spi_master spi32765: problem initializing queue
[ 95.912333] qtec_pcie b0030000.pcie_bridge: Axi-pcie bridge supervisor
[ 240.463698] INFO: task udevd:129 blocked for more than 120 seconds.
[ 240.463724] Not tainted 3.13.0-qtec-standard+ #191
[ 240.463733] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 240.463743] udevd D ffff880087815ac0 0 129 118 0x00000006
[ 240.463762] ffff880086593590 0000000000000002 ffff880087815ac0 ffff880086593fd8
[ 240.463778] 0000000000012c00 0000000000012c00 ffff880087815ac0 ffff880086593520
[ 240.463792] ffffffff813debe7 ffffffff810be6df ffffffff81da539c 0000000000000000
[ 240.463807] Call Trace:
[ 240.463836] [<ffffffff813debe7>] ? vt_console_print+0x57/0x3e0
[ 240.463852] [<ffffffff810be6df>] ? print_prefix+0x6f/0xb0
[ 240.463867] [<ffffffff810bf45c>] ? wake_up_klogd+0x3c/0x50
[ 240.463880] [<ffffffff810bf67b>] ? console_unlock+0x20b/0x3f0
[ 240.463897] [<ffffffff8178b799>] schedule+0x29/0x70
[ 240.463910] [<ffffffff8178a8d9>] schedule_timeout+0x189/0x240
[ 240.463925] [<ffffffff813fd510>] ? dev_vprintk_emit+0x50/0x60
[ 240.463939] [<ffffffff8178c167>] wait_for_common+0xe7/0x190
[ 240.463954] [<ffffffff810a7780>] ? wake_up_process+0x40/0x40
[ 240.463968] [<ffffffff8178c22d>] wait_for_completion+0x1d/0x20
[ 240.463981] [<ffffffff810996bc>] flush_kthread_worker+0x6c/0x80
[ 240.463995] [<ffffffff8178c2cd>] ? wait_for_completion_killable+0x1d/0x40
[ 240.464007] [<ffffffff81099162>] ? kthread_create_on_node+0xd2/0x190
[ 240.464020] [<ffffffff81099000>] ? kthread_freezable_should_stop+0x80/0x80
[ 240.464036] [<ffffffff8146c637>] spi_destroy_queue+0x27/0x60
[ 240.464050] [<ffffffff8146cc46>] spi_register_master+0x5d6/0x900
[ 240.464072] [<ffffffffa0000713>] spi_bitbang_start+0x83/0x110 [spi_bitbang]
[ 240.464089] [<ffffffffa0005960>] xilinx_spi_probe+0x230/0x3aa [spi_xilinx]
[ 240.464104] [<ffffffff81403645>] platform_drv_probe+0x45/0xb0
[ 240.464120] [<ffffffff81401052>] ? driver_sysfs_add+0x82/0xb0
[ 240.464134] [<ffffffff81401795>] driver_probe_device+0x125/0x3b0
[ 240.464149] [<ffffffff81401a20>] ? driver_probe_device+0x3b0/0x3b0
[ 240.464163] [<ffffffff81401a5b>] __device_attach+0x3b/0x40
[ 240.464177] [<ffffffff813ff7c3>] bus_for_each_drv+0x63/0xa0
[ 240.464191] [<ffffffff814015f8>] device_attach+0x88/0xa0
[ 240.464205] [<ffffffff81400a08>] bus_probe_device+0x98/0xc0
[ 240.464218] [<ffffffff813fe865>] device_add+0x495/0x600
[ 240.464233] [<ffffffff815d860f>] of_device_add+0x2f/0x40
[ 240.464246] [<ffffffff815d8dab>] of_platform_device_create_pdata+0x6b/0xb0
[ 240.464259] [<ffffffff815d8f03>] of_platform_bus_create+0xf3/0x200
[ 240.464272] [<ffffffff815d7228>] ? __of_match_node+0x48/0xe0
[ 240.464286] [<ffffffff815d8f5e>] of_platform_bus_create+0x14e/0x200
[ 240.464298] [<ffffffff815d6adc>] ? __of_find_property+0x3c/0x80
[ 240.464312] [<ffffffff815d9177>] of_platform_populate+0x47/0x90
[ 240.464334] [<ffffffffa000bcf2>] qt5023_of_populate+0x562/0x980 [qt5023]
[ 240.464357] [<ffffffffa000c363>] qt5023_of_probe+0x1d3/0x300 [qt5023]
[ 240.464472] [<ffffffffa000a123>] qt5023_pci_probe+0xd3/0x1c0 [qt5023]
[ 240.464491] [<ffffffff813682d4>] pci_device_probe+0x84/0xe0
[ 240.464507] [<ffffffff81401795>] driver_probe_device+0x125/0x3b0
[ 240.464522] [<ffffffff81401af3>] __driver_attach+0x93/0xa0
[ 240.464536] [<ffffffff81401a60>] ? __device_attach+0x40/0x40
[ 240.464550] [<ffffffff813ff703>] bus_for_each_dev+0x63/0xa0
[ 240.464585] [<ffffffff8140114e>] driver_attach+0x1e/0x20
[ 240.464640] [<ffffffff81400d30>] bus_add_driver+0x180/0x250
[ 240.464687] [<ffffffffa0010000>] ? 0xffffffffa000ffff
[ 240.464738] [<ffffffff81402164>] driver_register+0x64/0xf0
[ 240.464789] [<ffffffffa0010000>] ? 0xffffffffa000ffff
[ 240.464845] [<ffffffff81367d9b>] __pci_register_driver+0x4b/0x50
[ 240.464899] [<ffffffffa0010031>] qt5023_init+0x31/0x33 [qt5023]
[ 240.464943] [<ffffffff810002f2>] do_one_initcall+0xd2/0x180
[ 240.464960] [<ffffffff8109da88>] ? __blocking_notifier_call_chain+0x58/0x70
[ 240.464976] [<ffffffff810e07c6>] load_module+0x1ad6/0x23a0
[ 240.464992] [<ffffffff810dd5d0>] ? store_uevent+0x40/0x40
[ 240.465010] [<ffffffff810de5ea>] ? copy_module_from_fd.isra.50+0x12a/0x190
[ 240.465024] [<ffffffff810e1226>] SyS_finit_module+0x86/0xb0
[ 240.465041] [<ffffffff81797049>] tracesys+0xd0/0xd5
[ 360.540806] INFO: task udevd:129 blocked for more than 120 seconds.
[ 360.540832] Not tainted 3.13.0-qtec-standard+ #191
[ 360.540841] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 360.540851] udevd D ffff880087815ac0 0 129 118 0x00000006
[ 360.540871] ffff880086593590 0000000000000002 ffff880087815ac0 ffff880086593fd8
[ 360.540886] 0000000000012c00 0000000000012c00 ffff880087815ac0 ffff880086593520
[ 360.540900] ffffffff813debe7 ffffffff810be6df ffffffff81da539c 0000000000000000
[ 360.540915] Call Trace:
[ 360.540943] [<ffffffff813debe7>] ? vt_console_print+0x57/0x3e0
[ 360.540959] [<ffffffff810be6df>] ? print_prefix+0x6f/0xb0
[ 360.540974] [<ffffffff810bf45c>] ? wake_up_klogd+0x3c/0x50
[ 360.540988] [<ffffffff810bf67b>] ? console_unlock+0x20b/0x3f0
[ 360.541004] [<ffffffff8178b799>] schedule+0x29/0x70
[ 360.541017] [<ffffffff8178a8d9>] schedule_timeout+0x189/0x240
[ 360.541032] [<ffffffff813fd510>] ? dev_vprintk_emit+0x50/0x60
[ 360.541046] [<ffffffff8178c167>] wait_for_common+0xe7/0x190
[ 360.541061] [<ffffffff810a7780>] ? wake_up_process+0x40/0x40
[ 360.541075] [<ffffffff8178c22d>] wait_for_completion+0x1d/0x20
[ 360.541089] [<ffffffff810996bc>] flush_kthread_worker+0x6c/0x80
[ 360.541102] [<ffffffff8178c2cd>] ? wait_for_completion_killable+0x1d/0x40
[ 360.541115] [<ffffffff81099162>] ? kthread_create_on_node+0xd2/0x190
[ 360.541127] [<ffffffff81099000>] ? kthread_freezable_should_stop+0x80/0x80
[ 360.541144] [<ffffffff8146c637>] spi_destroy_queue+0x27/0x60
[ 360.541157] [<ffffffff8146cc46>] spi_register_master+0x5d6/0x900
[ 360.541179] [<ffffffffa0000713>] spi_bitbang_start+0x83/0x110 [spi_bitbang]
[ 360.541196] [<ffffffffa0005960>] xilinx_spi_probe+0x230/0x3aa [spi_xilinx]
[ 360.541211] [<ffffffff81403645>] platform_drv_probe+0x45/0xb0
[ 360.541226] [<ffffffff81401052>] ? driver_sysfs_add+0x82/0xb0
[ 360.541240] [<ffffffff81401795>] driver_probe_device+0x125/0x3b0
[ 360.541255] [<ffffffff81401a20>] ? driver_probe_device+0x3b0/0x3b0
[ 360.541269] [<ffffffff81401a5b>] __device_attach+0x3b/0x40
[ 360.541283] [<ffffffff813ff7c3>] bus_for_each_drv+0x63/0xa0
[ 360.541297] [<ffffffff814015f8>] device_attach+0x88/0xa0
[ 360.541311] [<ffffffff81400a08>] bus_probe_device+0x98/0xc0
[ 360.541324] [<ffffffff813fe865>] device_add+0x495/0x600
[ 360.541339] [<ffffffff815d860f>] of_device_add+0x2f/0x40
[ 360.541352] [<ffffffff815d8dab>] of_platform_device_create_pdata+0x6b/0xb0
[ 360.541366] [<ffffffff815d8f03>] of_platform_bus_create+0xf3/0x200
[ 360.541378] [<ffffffff815d7228>] ? __of_match_node+0x48/0xe0
[ 360.541392] [<ffffffff815d8f5e>] of_platform_bus_create+0x14e/0x200
[ 360.541404] [<ffffffff815d6adc>] ? __of_find_property+0x3c/0x80
[ 360.541418] [<ffffffff815d9177>] of_platform_populate+0x47/0x90
[ 360.541441] [<ffffffffa000bcf2>] qt5023_of_populate+0x562/0x980 [qt5023]
[ 360.541463] [<ffffffffa000c363>] qt5023_of_probe+0x1d3/0x300 [qt5023]
[ 360.541484] [<ffffffffa000a123>] qt5023_pci_probe+0xd3/0x1c0 [qt5023]
[ 360.541502] [<ffffffff813682d4>] pci_device_probe+0x84/0xe0
[ 360.541517] [<ffffffff81401795>] driver_probe_device+0x125/0x3b0
[ 360.541620] [<ffffffff81401af3>] __driver_attach+0x93/0xa0
[ 360.541636] [<ffffffff81401a60>] ? __device_attach+0x40/0x40
[ 360.541650] [<ffffffff813ff703>] bus_for_each_dev+0x63/0xa0
[ 360.541665] [<ffffffff8140114e>] driver_attach+0x1e/0x20
[ 360.541680] [<ffffffff81400d30>] bus_add_driver+0x180/0x250
[ 360.541748] [<ffffffffa0010000>] ? 0xffffffffa000ffff
[ 360.541793] [<ffffffff81402164>] driver_register+0x64/0xf0
[ 360.541845] [<ffffffffa0010000>] ? 0xffffffffa000ffff
[ 360.541895] [<ffffffff81367d9b>] __pci_register_driver+0x4b/0x50
[ 360.541954] [<ffffffffa0010031>] qt5023_init+0x31/0x33 [qt5023]
[ 360.542007] [<ffffffff810002f2>] do_one_initcall+0xd2/0x180
[ 360.542062] [<ffffffff8109da88>] ? __blocking_notifier_call_chain+0x58/0x70
[ 360.542085] [<ffffffff810e07c6>] load_module+0x1ad6/0x23a0
[ 360.542101] [<ffffffff810dd5d0>] ? store_uevent+0x40/0x40
[ 360.542119] [<ffffffff810de5ea>] ? copy_module_from_fd.isra.50+0x12a/0x190
[ 360.542133] [<ffffffff810e1226>] SyS_finit_module+0x86/0xb0
[ 360.542150] [<ffffffff81797049>] tracesys+0xd0/0xd5
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
---
drivers/spi/spi.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 4eb9bf0..8331556 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1114,8 +1114,10 @@ static int spi_destroy_queue(struct spi_master *master)
return ret;
}
- flush_kthread_worker(&master->kworker);
- kthread_stop(master->kworker_task);
+ if (!IS_ERR(master->kworker_task)) {
+ flush_kthread_worker(&master->kworker);
+ kthread_stop(master->kworker_task);
+ }
return 0;
}
--
1.9.2
--
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