<div dir="ltr"><div>OK ! So USB Driver is trying to read but physically disk is not enumerated but USB Subsystem did recognize the disk as per Logs. <br><br> usb 2-1.1: new high speed USB device number 6 using fsl-ehci<br>
<br><6>[ 216.990681] scsi1 : usb-storage 2-1.1:1.0<br><br><5>[ 217.983182] scsi 1:0:0:0: Direct-Access USB2.0 Flash Disk 0.00 PQ: 0 ANSI: 2<br><br><5>[ 217.986978] sd 1:0:0:0: [sdb] 3904512 512-byte logical blocks: (1.99 GB/1.86 GiB)<br>
<br><5>[ 217.987461] sd 1:0:0:0: [sdb] Write Protect is off<br><br><7>[ 217.987473] sd 1:0:0:0: [sdb] Mode Sense: 00 00 00 00<br><br><3>[ 217.987958] sd 1:0:0:0: [sdb] Asking for cache data failed<br>
<br><3>[ 217.987968] sd 1:0:0:0: [sdb] Assuming drive cache: write through<br><br><3>[ 217.991715] sd 1:0:0:0: [sdb] Asking for cache data failed<br><br><3>[ 217.991726] sd 1:0:0:0: [sdb] Assuming drive cache: write through<br>
<br><6>[ 218.215499] sdb:<br><br><3>[ 218.221482] sd 1:0:0:0: [sdb] Asking for cache data failed<br><br><3>[ 218.221513] sd 1:0:0:0: [sdb] Assuming drive cache: write through<br><br><5>[ 218.221529] sd 1:0:0:0: [sdb] Attached SCSI removable disk<br>
<br><3>[ 218.431346] FAT-fs (sda): Directory bread(block 480) failed<br><br><3>[ 218.431362] FAT-fs (sda): Directory bread(block 481) failed<br><br><3>[ 218.431374] FAT-fs (sda): Directory bread(block 482) failed<br>
<br><3>[ 218.431386] FAT-fs (sda): Directory bread(block 483) failed<br><br></div>Regards<br>Sanjeev Sharma<br><div><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Wed, Jun 18, 2014 at 12:37 PM, Greg KH <span dir="ltr"><<a href="mailto:greg@kroah.com" target="_blank">greg@kroah.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="HOEnZb"><div class="h5">On Wed, Jun 18, 2014 at 12:22:33PM +0530, sanjeev sharma wrote:<br>
> Hi Greg,<br>
><br>
> In one of my imx6 based Board when I connect USB Disk first time everything<br>
> work's ok and I can read/write content from USB Flash Driver but when I do<br>
> eject and connect again I could see below continuous messages from dmesg<br>
> and disk never mounted.<br>
><br>
> 218.431346] FAT-fs (sda): Directory bread(block 480) failed<br>
><br>
> <3>[ 218.431362] FAT-fs (sda): Directory bread(block 481) failed<br>
><br>
> <3>[ 218.431374] FAT-fs (sda): Directory bread(block 482) failed<br>
><br>
> <3>[ 218.431386] FAT-fs (sda): Directory bread(block 483) failed<br>
><br>
> <3>[ 218.431398] FAT-fs (sda): Directory bread(block 484) failed<br>
><br>
> <3>[ 218.431420] FAT-fs (sda): Directory bread(block 485) failed<br>
><br>
> <3>[ 218.431432] FAT-fs (sda): Directory bread(block 486) failed<br>
><br>
> <3>[ 218.431444] FAT-fs (sda): Directory bread(block 487) failed<br>
><br>
> <3>[ 218.431466] FAT-fs (sda): Directory bread(block 488) failed<br>
><br>
> <3>[ 218.431478] FAT-fs (sda): Directory bread(block 489) failed<br>
><br>
> <3>[ 218.431499] FAT-fs (sda): Directory bread(block 490) failed<br>
><br>
> <3>[ 218.431515] FAT-fs (sda): Directory bread(block 491) failed<br>
><br>
> <3>[ 218.431528] FAT-fs (sda): Directory bread(block 492) failed<br>
><br>
> <3>[ 218.431540] FAT-fs (sda): Directory bread(block 493) failed<br>
><br>
> <3>[ 218.431551] FAT-fs (sda): Directory bread(block 494) failed<br>
><br>
> <3>[ 218.431563] FAT-fs (sda): Directory bread(block 495) failed<br>
><br>
> <3>[ 218.431592] FAT-fs (sda): Directory bread(block 496) failed<br>
><br>
> <3>[ 218.431604] FAT-fs (sda): Directory bread(block 497) failed<br>
><br>
> <3>[ 218.431616] FAT-fs (sda): Directory bread(block 498) failed<br>
><br>
> <3>[ 218.431627] FAT-fs (sda): Directory bread(block 499)<br>
><br>
> is this probably issue in driver where It is failing to properly re-init<br>
> the USB device 2nd time ?<br>
<br>
</div></div>I have no idea, something is trying to read those blocks and failing,<br>
perhaps a program doesn't realize the disk is no longer there anymore?<br>
<br>
greg k-h<br>
</blockquote></div><br></div>