LinuxQuestions.org - Problem mounting mobile phone's mass storage

- Linux - General (https://www.linuxquestions.org/questions/linux-general-1/)

- - Problem mounting mobile phone's mass storage (https://www.linuxquestions.org/questions/linux-general-1/problem-mounting-mobile-phones-mass-storage-864453/)

Problem mounting mobile phone's mass storage

Hi,

I have a problem when trying to mount a memory card in my cell phone. I connect the phone with an USB cable, select mass storage as the phone prompts it, but no luck.

dmesg shows

Code:

[  200.673190] usb 3-1: new full speed USB device using ohci_hcd and address 4

[  200.823377] usb 3-1: New USB device found, idVendor=05c6, idProduct=1000

[  200.823386] usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3

[  200.823393] usb 3-1: Product: USB MMC Storage

[  200.823398] usb 3-1: Manufacturer: SAMSUNG Electronics Co.,Ltd.

[  200.823403] usb 3-1: SerialNumber: 000000000002

[  200.831545] scsi7 : usb-storage 3-1:1.0

[  201.838429] scsi 7:0:0:0: Direct-Access    SAMSUNG  GT-S5600        2.31 PQ: 0 ANSI: 2

[  201.838984] sd 7:0:0:0: Attached scsi generic sg3 type 0

[  201.858343] sd 7:0:0:0: [sdc] 3862528 512-byte logical blocks: (1.97 GB/1.84 GiB)

[  201.868370] sd 7:0:0:0: [sdc] Write Protect is off

[  201.868380] sd 7:0:0:0: [sdc] Mode Sense: 0b 00 00 08

[  201.868386] sd 7:0:0:0: [sdc] Assuming drive cache: write through

[  201.896402] sd 7:0:0:0: [sdc] Assuming drive cache: write through

[  201.906420]  sdc:

[  201.934336] sd 7:0:0:0: [sdc] Assuming drive cache: write through

[  201.934341] sd 7:0:0:0: [sdc] Attached SCSI removable disk

lsusb:

Code:

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

Bus 003 Device 002: ID 046d:c040 Logitech, Inc. Corded Tilt-Wheel Mouse

Bus 003 Device 004: ID 05c6:1000 Qualcomm, Inc. Mass Storage Device

I have tried a couple of kernel versions and even though one can clearly see that the memory card is recognized as a mass storage device and registered as such by the kernel, even the raw /dev/sdc device isn't created.

Just to be sure I tried the same thing with FreeBSD, though I knew from past experiences what to expect from it. It just worked(tm) flawlessly, but I'd rather not keep FreeBSD just for the sake of one device I can't seem to get working with Linux. All I can guess it must either be a kernel bug that has persisted for far too long or a faulty udev rule.

Thanks in advance if someone knows how to resolve this or give any pointers on what to try.

How exactly are you trying to mount it?

Sorry for the misinformation. There isn't a way I can mount it as of now since the device node isn't created
maybe I could create it manually with MAKEDEV, but I would still need the major/minor numbers...

The other thing is that I find odd that the kernel prints the device information, assigns a node to it but never creates anything under /dev. Even if it can't find any partitions on it, it should AFAIK at least create the raw device node?

According to your /var/log/messages, sdc is there. Can you post the output of ls -al /dev/sd* ? I don't see why it isn't either...

brw-rw---- 1 root disk 8, 0 Feb 23 11:18 /dev/sda
brw-rw---- 1 root disk 8, 1 Feb 23 11:18 /dev/sda1
brw-rw---- 1 root disk 8, 2 Feb 23 11:18 /dev/sda2
brw-rw---- 1 root disk 8, 3 Feb 23 11:18 /dev/sda3
brw-rw---- 1 root disk 8, 4 Feb 23 11:18 /dev/sda4
brw-rw---- 1 root disk 8, 16 Feb 23 11:18 /dev/sdb
brw-rw---- 1 root disk 8, 17 Feb 23 11:18 /dev/sdb1
brw-rw---- 1 root disk 8, 18 Feb 23 11:18 /dev/sdb2
brw-rw---- 1 root disk 8, 19 Feb 23 11:18 /dev/sdb3

Does anyone know any program that could be used to monitor what udev and the kernel are doing whilst connecting the device?

Are you getting anything weird in dmesg?

Nothing particularly interesting, but I did further testing

udevadm monitor shows

Code:

monitor will print the received events for:

UDEV - the event which udev sends out after rule processing

KERNEL - the kernel uevent



KERNEL[1298494568.160599] add      /devices/pci0000:00/0000:00:13.0/usb5/5-2 (usb)

KERNEL[1298494568.162511] add      /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0 (usb)

KERNEL[1298494568.175516] add      /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12 (scsi)

KERNEL[1298494568.175537] add      /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/scsi_host/host12 (scsi_host)

UDEV  [1298494568.405766] add      /devices/pci0000:00/0000:00:13.0/usb5/5-2 (usb)

UDEV  [1298494568.409711] add      /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0 (usb)

UDEV  [1298494568.410427] add      /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12 (scsi)

UDEV  [1298494568.410849] add      /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/scsi_host/host12 (scsi_host)

KERNEL[1298494569.184572] add      /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/target12:0:0 (scsi)

KERNEL[1298494569.184594] add      /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/target12:0:0/12:0:0:0 (scsi)

KERNEL[1298494569.184603] add      /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/target12:0:0/12:0:0:0/scsi_disk/12:0:0:0 (scsi_disk)

KERNEL[1298494569.184611] add      /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/target12:0:0/12:0:0:0/scsi_device/12:0:0:0 (scsi_device)

KERNEL[1298494569.184621] add      /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/target12:0:0/12:0:0:0/scsi_generic/sg3 (scsi_generic)

KERNEL[1298494569.184631] add      /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/target12:0:0/12:0:0:0/bsg/12:0:0:0 (bsg)

UDEV  [1298494569.184981] add      /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/target12:0:0 (scsi)

UDEV  [1298494569.185191] add      /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/target12:0:0/12:0:0:0 (scsi)

UDEV  [1298494569.185804] add      /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/target12:0:0/12:0:0:0/scsi_device/12:0:0:0 (scsi_device)

UDEV  [1298494569.186185] add      /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/target12:0:0/12:0:0:0/scsi_disk/12:0:0:0 (scsi_disk)

UDEV  [1298494569.186648] add      /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/target12:0:0/12:0:0:0/scsi_generic/sg3 (scsi_generic)

UDEV  [1298494569.186792] add      /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/target12:0:0/12:0:0:0/bsg/12:0:0:0 (bsg)

KERNEL[1298494569.214347] add      /devices/virtual/bdi/8:32 (bdi)

UDEV  [1298494569.215610] add      /devices/virtual/bdi/8:32 (bdi)

KERNEL[1298494569.218335] change  /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/target12:0:0/12:0:0:0 (scsi)

UDEV  [1298494569.218860] change  /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/target12:0:0/12:0:0:0 (scsi)

KERNEL[1298494569.259355] add      /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/target12:0:0/12:0:0:0/block/sdc (block)

UDEV  [1298494570.137872] add      /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/target12:0:0/12:0:0:0/block/sdc (block)

KERNEL[1298494572.698989] remove  /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/target12:0:0/12:0:0:0/bsg/12:0:0:0 (bsg)

KERNEL[1298494572.699010] remove  /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/target12:0:0/12:0:0:0/scsi_generic/sg3 (scsi_generic)

KERNEL[1298494572.699019] remove  /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/target12:0:0/12:0:0:0/scsi_device/12:0:0:0 (scsi_device)

KERNEL[1298494572.699027] remove  /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/target12:0:0/12:0:0:0/scsi_disk/12:0:0:0 (scsi_disk)

UDEV  [1298494572.699200] remove  /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/target12:0:0/12:0:0:0/bsg/12:0:0:0 (bsg)

UDEV  [1298494572.699373] remove  /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/target12:0:0/12:0:0:0/scsi_generic/sg3 (scsi_generic)

UDEV  [1298494572.699504] remove  /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/target12:0:0/12:0:0:0/scsi_device/12:0:0:0 (scsi_device)

UDEV  [1298494572.699617] remove  /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/target12:0:0/12:0:0:0/scsi_disk/12:0:0:0 (scsi_disk)

KERNEL[1298494572.701468] remove  /devices/virtual/bdi/8:32 (bdi)

KERNEL[1298494572.701749] remove  /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/target12:0:0/12:0:0:0/block/sdc (block)

UDEV  [1298494572.701761] remove  /devices/virtual/bdi/8:32 (bdi)

UDEV  [1298494572.701969] remove  /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/target12:0:0/12:0:0:0/block/sdc (block)

KERNEL[1298494572.702201] remove  /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/target12:0:0/12:0:0:0 (scsi)

UDEV  [1298494572.702213] remove  /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/target12:0:0/12:0:0:0 (scsi)

KERNEL[1298494572.702276] remove  /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/target12:0:0 (scsi)

UDEV  [1298494572.702354] remove  /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/target12:0:0 (scsi)

KERNEL[1298494572.702877] remove  /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/scsi_host/host12 (scsi_host)

UDEV  [1298494572.703302] remove  /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12/scsi_host/host12 (scsi_host)

KERNEL[1298494572.703441] remove  /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12 (scsi)

UDEV  [1298494572.703532] remove  /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/host12 (scsi)

It seems that for some odd reason the kernel/udev is unplugging the device right after it is found, can you think of anything that would cause this kind of behavior?