On Sat, 5 Sep 2009, [UTF-8] Mantas MikulÄ?nas wrote: > usbmon trace attached (and uploaded to > <http://sine.cluenet.org/~grawity/trash/usbmon-2u.log>) The usbmon trace shows several related problems. The phone reports that it has two logical units (LUNs). It says that LUN 0 has 120093 sectors (60 MB) and LUN 1 has 3995649 sectors (2 GB). The first problem occurs when the kernel tries to read 8 sectors from LUN 0 starting at sector 120072. The phone provides only 4 sectors of data together with a Check Condition error indication, but when asked for more detailed error information (Request Sense) it sends no error data (No sense). With no error info, the kernel thinks that nothing was really wrong so it tries issuing the READ command again, with the same result, over and over... This unending loop is the second problem. The third problem is like the first; it occurs when the kernel tries to read sector 3995648 of LUN 1 (the last sector). The same sort of thing happens; the phone provides no data and an error indication but no error data, so the command is retried over and over. The first and third problems are caused by bugs in the phone. There may be no good way around the first, but you should be able to fix the third by specifying the "quirks" module parameter for usb-storage. Add a line saying options usb-storage quirks=fce:e0c6:c to your /etc/modprobe.conf file. This will tell the kernel that each LUN really has one fewer sector than the phone claims. The second problem has nothing to do with USB; it is a bug in the SCSI layer. If the module parameter doesn't fix everything, I suggest this bug report be reassigned to James Bottomley rather than Greg Kroah-Hartman and the component be changed from USB to SCSI. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
