The TUR commands come from the sd_mod (I think). Definitely not from usb-storage. So I would take it up at that level. Matt On Wed, Jan 3, 2018 at 4:25 PM, Eduardo Trápani <etrapani@xxxxxxxxx> wrote: > Usually the kernel reads the pendrive like this: > > TEST UNIT READY > READ(10) > ... > READ(10) > TEST UNIT READY > > But under some conditions, the last TEST UNIT READY is not being sent > and because of that, on this device: Kingston DT 101 G2, the drive's > activity light keeps on blinking even though nothing is being done (no > read/writes/inquiries). > > When that happens, manually sending a TEST UNIT READY stops the blinking > and turns off the light. > > # sg_turs /dev/sdc > > For example this works alright (light blinks for a moment and then it's > off): > > # dd if=/dev/sdc of=/dev/null bs=512 count=96 > > But this doesn't (the light keeps on blinking forever) > > # dd if=/dev/sdb of=/dev/null bs=512 count=97 > > I checked with usbmon and I noticed the lack of the final TEST UNIT > READY in the cases where the light keeps on blinking. > > For the tests the drive was unmounted. As soon as I mount it and start > working on it, the light will blink non-stop. > > I also tested this with a Raspberry (Linux frambo 4.1.17+ #838 Tue Feb 9 > 12:57:10 GMT 2016 armv6l GNU/Linux), and the device behaves normally, > that is, blinking stops as soon as traffic stops. > > > Find attached the pcap file for both cases and part of the kernel dmesg. > This is the kernel with the problem: Linux arbo 4.9.0-4-amd64 #1 SMP > Debian 4.9.65-3+deb9u1 (2017-12-23) x86_64 GNU/Linux > > Eduardo. > -- Matthew Dharm Former Maintainer, USB Mass Storage driver for Linux -- 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
