On Mon, 6 Jul 2009 23:31:22 +0530, Ramya Desai <ramya.desai@xxxxxxxxx> wrote: > On Mon, Jul 6, 2009 at 11:27 PM, Alan Stern<stern@xxxxxxxxxxxxxxxxxxx> wrote: > > On Mon, 6 Jul 2009, Ramya Desai wrote: > >> Is there any limitation in calling usb_sg_init() from completion callback? > >> I am getting the srb structure parameters from URB context. > > > > You can call usb_sg_init from a completion callback, provided you pass > > it the GFP_ATOMIC memory flag. However you cannot call usb_sg_wait > > from a completion callback. > If I schedule a tasklet, can I call usb_sg_wait() from that tasklet ?. No. A tasklet is the same as interrupt, as far as limitations on sleeping go. What are you trying to accomplish anyway? I know that you're writing some kind of another ub or a threadless usb-storage, but what is it for? -- Pete -- 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
