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unforgiven512 kk-kishorekumar global19

w1_ds28e17's Issues

"Invalid GPIO" warning on Raspberry Pi 3

I installed this module on a Raspberry Pi 3 using the sources from the latest kernel version in the Raspbian repository (4.9.35-v7+/raspberrypi-kernel_1.20170703-1), and it worked for a little while until it stopped working and this warning started filling dmesg:

[68811.133384] ------------[ cut here ]------------
[68811.133394] WARNING: CPU: 1 PID: 30515 at drivers/gpio/gpiolib.c:106 gpio_to_desc+0xc8/0xd0
[68811.133398] invalid GPIO -1193792064
[68811.133402] Modules linked in: w1_gpio(-) wire(O) configs brcmfmac brcmutil cfg80211 rfkill snd_bcm2835 snd_pcm snd_timer snd i2c_bcm2835 bcm2835_gpiomem uio_pdrv_genirq uio fixed i2c_dev cn fuse ipv6 [last unloaded: w1_ds2413]
[68811.133504] CPU: 1 PID: 30515 Comm: w1_bus_master1 Tainted: G      D W  O    4.9.35-v7+ #1014
[68811.133515] Hardware name: BCM2835
[68811.133531] [<8010fb3c>] (unwind_backtrace) from [<8010c058>] (show_stack+0x20/0x24)
[68811.133546] [<8010c058>] (show_stack) from [<80455880>] (dump_stack+0xd4/0x118)
[68811.133562] [<80455880>] (dump_stack) from [<8011d344>] (__warn+0xf8/0x110)
[68811.133578] [<8011d344>] (__warn) from [<8011d3a4>] (warn_slowpath_fmt+0x48/0x50)
[68811.133594] [<8011d3a4>] (warn_slowpath_fmt) from [<80487ba0>] (gpio_to_desc+0xc8/0xd0)
[68811.133614] [<80487ba0>] (gpio_to_desc) from [<7f3774b0>] (w1_gpio_write_bit_dir+0x34/0x3c [w1_gpio])
[68811.133643] [<7f3774b0>] (w1_gpio_write_bit_dir [w1_gpio]) from [<7f36b358>] (w1_write_bit+0x6c/0x114 [wire])
[68811.133681] [<7f36b358>] (w1_write_bit [wire]) from [<7f36ba84>] (w1_triplet+0xc4/0xcc [wire])
[68811.133719] [<7f36ba84>] (w1_triplet [wire]) from [<7f3694c4>] (w1_search+0x114/0x264 [wire])
[68811.133757] [<7f3694c4>] (w1_search [wire]) from [<7f36bae0>] (w1_search_devices+0x54/0x58 [wire])
[68811.133800] [<7f36bae0>] (w1_search_devices [wire]) from [<7f369688>] (w1_search_process_cb+0x74/0x120 [wire])
[68811.133838] [<7f369688>] (w1_search_process_cb [wire]) from [<7f3698bc>] (w1_process+0x104/0x13c [wire])
[68811.133865] [<7f3698bc>] (w1_process [wire]) from [<8013c8c8>] (kthread+0x10c/0x124)
[68811.133888] [<8013c8c8>] (kthread) from [<80108148>] (ret_from_fork+0x14/0x2c)
[68811.133900] ---[ end trace 003b29729f774a67 ]---

The w1_gpio module then became unresponsive and couldn't be unloaded with rmmod. I shut the system down to see if that would fix it but then it wouldn't boot up again (Maybe because the warning spam filled the system logs and the SD card?)

A couple of other things I noticed:

  • I just put one instance of the warning here, but when it's repeated the trace might differ slightly. w1_triplet will sometimes call w1_write_bit and other times call w1_touch_bit.
  • I installed this module on a similar Raspberry Pi 3 and it ran for at least the same amount of time that the first one ran without this happening.

I'm not really sure what triggered this. I'll do a bit of detective work and update this post if I find anything that seems useful.

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