Unsuccessful transactions during usb enumeration

[Greg KH]

On Wed, Jun 18, 2014 at 12:22:33PM +0530, sanjeev sharma wrote:
> 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 ?

I have no idea, something is trying to read those blocks and failing,
perhaps a program doesn't realize the disk is no longer there anymore?

greg k-h