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Message-ID: <20130218174916.GA2070@kroah.com> Date: Mon, 18 Feb 2013 09:49:16 -0800 From: Greg KH <gregkh@...uxfoundation.org> To: Felipe Balbi <balbi@...com> Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: SYSFS "errors" On Mon, Feb 18, 2013 at 07:27:00PM +0200, Felipe Balbi wrote: > On Mon, Feb 18, 2013 at 09:13:34AM -0800, Greg KH wrote: > > On Mon, Feb 18, 2013 at 05:52:15PM +0200, Felipe Balbi wrote: > > > Hi, > > > > > > On Mon, Feb 18, 2013 at 07:50:12AM -0800, Greg KH wrote: > > > > > If it helps in any way, I have printed below only the filenames > > > > > (without path) so I could pipe it through uniq: > > > > > > > > > > act_mask > > > > > audit > > > > > autosuspend_delay_ms > > > > > bind > > > > > > > > This one the driver core creates, I'll fix that up. > > > > > > > > The rest need paths to determine who to blame :) > > > > > > wanna see the full list ? It's 1602 lines :-p > > > > You must have more devices in your system than I do: > > $ ruby ./sysfs_test.ruby | wc -l > > 626 > > > > What kernel version did you run this on? I don't see any "bind" file in > > the list on 3.8.0-rc7+: > > running on -rc6: > > $ uname -r > 3.8.0-rc6+ > > > $ ls -l /sys/bus/platform/drivers/pcspkr/bind > > --w------- 1 root root 4096 Feb 18 09:09 /sys/bus/platform/drivers/pcspkr/bind > > $ ls -l /sys/bus/serio/drivers/atkbd/unbind > > --w------- 1 root root 4096 Feb 18 09:09 /sys/bus/serio/drivers/atkbd/unbind > > > > So the full list might be necessary here, thanks. > > yeah, I figured one thing later. Ruby is stupid, if you run it as root, > it File.readable? will return true even if there's no read permission. > So I'm running only as a normal user, full output attached > > -- > balbi > Input/output error - /sys/devices/cpu/power/autosuspend_delay_ms The issue with this file is, if the power.use_autosuspend flag is not set for the device, then it can't be read or written to. This flag changes dynamically with the system state (__pm_runtime_use_autosuspend() can change it), so we can't just not show the file if the flag is not set properly, sorry. So the "error" is correct here, as is the 0644 file value. Take that sysfs file out of your results, reduces it to a mere handful of files: > No such device - /sys/devices/pci0000:00/0000:00:03.0/0000:02:00.0/graphics/fb0/bl_curve I don't really have a framebuffer in this box either it seems, so reading this file correctly returns -ENODEV. > No such device or address - /sys/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.1/2-5.1.1/2-5.1.1:1.0/host100/target100:0:0/100:0:0:0/block/sdc/trace/pid > No such device or address - /sys/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.1/2-5.1.1/2-5.1.1:1.0/host100/target100:0:0/100:0:0:0/block/sdc/trace/end_lba > No such device or address - /sys/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.1/2-5.1.1/2-5.1.1:1.0/host100/target100:0:0/100:0:0:0/block/sdc/trace/enable > No such device or address - /sys/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.1/2-5.1.1/2-5.1.1:1.0/host100/target100:0:0/100:0:0:0/block/sdc/trace/act_mask > No such device or address - /sys/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5.1/2-5.1.1/2-5.1.1:1.0/host100/target100:0:0/100:0:0:0/block/sdc/trace/start_lba > Invalid argument - /sys/devices/pci0000:00/0000:00:1f.2/ata2/host1/scsi_host/host1/em_buffer > Invalid argument - /sys/devices/pci0000:00/0000:00:1f.2/ata2/host1/target1:0:0/1:0:0:0/sw_activity > Operation not supported - /sys/devices/pci0000:00/0000:00:1f.2/ata2/host1/target1:0:0/1:0:0:0/unload_heads SCSI fun, go poke the SCSI developers about these files, I know nothing about them, nor do I really want to :) > No such device - /sys/devices/system/edac/mc/mc0/sdram_scrub_rate Odd, go ask the edac developers > Input/output error - /sys/devices/system/memory/soft_offline_page > Input/output error - /sys/devices/system/memory/hard_offline_page These both should be mode 0400, not 0644, they have no 'show' attribute, that's a bug, care to make up a patch that I can take? Or I can, let me know. > Invalid argument - /sys/devices/virtual/net/lo/speed > Invalid argument - /sys/devices/virtual/net/lo/duplex Ask the network developers, odds are, the loopback device doesn't really have a speed :) > No such device or address - /sys/devices/virtual/block/loop0/trace/pid > No such device or address - /sys/devices/virtual/block/loop0/trace/end_lba > No such device or address - /sys/devices/virtual/block/loop0/trace/enable > No such device or address - /sys/devices/virtual/block/loop0/trace/act_mask > No such device or address - /sys/devices/virtual/block/loop0/trace/start_lba Hm, these show up for virtual block devices as well, maybe they aren't scsi specific, but rather block specific, go poke the block developers then. So the list is much more reasonable now, with at least 2 bugs found, nice. thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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