On Mon, Oct 29, 2012 at 8:39 PM, Alan Stern <st...@rowland.harvard.edu> wrote: > On Mon, 29 Oct 2012, megha dey wrote: > >> Hi, >> This is the patch I have applied. >> >> http://marc.info/?l=linux-usb&m=132024464410783&w=2 >> >> From the trace attached,we see that write_10(highlighted command) is >> taking about 10 seconds,by which time the host is timing out.The host >> then sends the next test_unit_ready command without getting the status >> for the previous write.Thus,here we get 2 CBW's without an intervening >> CSW. > > It's not at all clear why the WRITE(10) took so long. Was the FUA bit > turned on? What happens if you install the mass-storage gadget driver > with nofua module parameter enabled? > > Also, it is clear from this trace that the host is buggy. The > Bulk-Only spec states that when a command is aborted (as this one was), > the host must issue a Reset command to the device. > > Alan Stern >
Hi, This scenario apears on all standard windows XP PC's and can be simulated by putting some delay in vfs_write .Also in my case,FUA bit is not set (nofua is already enabled).This issue only comes with slower cards (class 2). -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
