On Sun, 23 Nov 2003, Stefano Barbato wrote: > I forgot to write that I'm running a vanilla kernel 2.4.22 on a VIA chipset > (VIA Epia board but I've also tried an ASUS [also with VIA chipset] with same > results). > > I managed to let it work once using the uhci driver (before was usb-uhci). The > first time I run dd it took about 10 seconds to return then everything worked > fine (i.e. no hangs) reading without any memcard inserted. I mean that it > returned I/O error almost immediately as it should. > > It also went ok reading from the card but when I removed and re-tried to read > from empty slot I got log errors again (see err_dd.log, note that it took > about a minute to return).
These results aren't too surprising. You were trying to read from two different slots! Go back and look at your log files. You'll see the successful one shows you accessing /dev/sda (LUN 0) and the one that failed shows you accessing /dev/sdd (LUN 3). The delay for the successful run is normal. Some units take a little while to get going when they first start up. 10 seconds isn't bad. My USB CDRW drive takes over 16 seconds to respond starting from the time I plug it into the computer, even with a disc already inserted. The errors in the log are also normal. After all, what do you expect if you try to read from an empty slot? The long delays are normal too. The system assumes that when the commands fail that it should wait a little while and try them over again -- which it did, for almost a minute. Judging from these log files, it looks as though usb-storage is doing exactly what it should. (Although it should never hang.) You might want to try posting your question to a SCSI mailing list. Explain what you're trying to do. They may just tell you that a polling read is a lousy way to determine whether or not any media is present in the drive. Alan Stern ------------------------------------------------------- This SF.net email is sponsored by: SF.net Giveback Program. Does SourceForge.net help you be more productive? Does it help you create better code? SHARE THE LOVE, and help us help YOU! Click Here: http://sourceforge.net/donate/ _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
