Unsuccessful transactions during usb enumeration

[sanjeev sharma]

Hi Greg,

In one of my imx6 based Board when I connect USB Disk first time everything
work's ok and I can read/write content from USB Flash Driver but when I do
eject and connect again I could see below continuous messages from dmesg
and disk never mounted.

 218.431346] FAT-fs (sda): Directory bread(block 480) failed

<3>[  218.431362] FAT-fs (sda): Directory bread(block 481) failed

<3>[  218.431374] FAT-fs (sda): Directory bread(block 482) failed

<3>[  218.431386] FAT-fs (sda): Directory bread(block 483) failed

<3>[  218.431398] FAT-fs (sda): Directory bread(block 484) failed

<3>[  218.431420] FAT-fs (sda): Directory bread(block 485) failed

<3>[  218.431432] FAT-fs (sda): Directory bread(block 486) failed

<3>[  218.431444] FAT-fs (sda): Directory bread(block 487) failed

<3>[  218.431466] FAT-fs (sda): Directory bread(block 488) failed

<3>[  218.431478] FAT-fs (sda): Directory bread(block 489) failed

<3>[  218.431499] FAT-fs (sda): Directory bread(block 490) failed

<3>[  218.431515] FAT-fs (sda): Directory bread(block 491) failed

<3>[  218.431528] FAT-fs (sda): Directory bread(block 492) failed

<3>[  218.431540] FAT-fs (sda): Directory bread(block 493) failed

<3>[  218.431551] FAT-fs (sda): Directory bread(block 494) failed

<3>[  218.431563] FAT-fs (sda): Directory bread(block 495) failed

<3>[  218.431592] FAT-fs (sda): Directory bread(block 496) failed

<3>[  218.431604] FAT-fs (sda): Directory bread(block 497) failed

<3>[  218.431616] FAT-fs (sda): Directory bread(block 498) failed

<3>[  218.431627] FAT-fs (sda): Directory bread(block 499)

is this probably issue in driver where It is failing to properly re-init
the USB device 2nd time ?

Regards
Sanjeev Sharma


On Wed, Jun 18, 2014 at 12:09 PM, Greg KH <greg at kroah.com> wrote:

> On Wed, Jun 18, 2014 at 06:26:23AM +0000, Ranjith T. C. wrote:
> > Thanks for the reply.
> >
> > > What exactly do you mean by this?
> >
> > What I meant is whether it could be could be an of the USB controller
> driver or the hardware?
>
> It could be both.  Or a bad cable, or bad connection.
>
> Try putting some debugging code in the Linux device side and see what
> that is telling you is happening.
>
> Try plugging the device into different operating systems with different
> types of host controller hardware to see if it is a timing issue.
>
> Good luck,
>
> greg k-h
>
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