From stf_xl@wp.pl Mon Aug 20 14:31:52 2007 From: Stanislaw Gruszka Date: Mon, 20 Aug 2007 23:21:10 +0200 Subject: UEAGLE: Avoid keyboard driver blocking To: Greg KH Cc: linux-usb-devel@lists.sourceforge.net, usbatm@lists.infradead.org, ueagleatm-dev@gna.org, linux-kernel@vger.kernel.org Message-ID: <200708202321.11149.stf_xl@wp.pl> Content-Disposition: inline Ueagle-atm driver load DSP firmware in function, which is running from common workqueue. In some (error) circumstances loading firmware may sleep for long periods (even 60 seconds, depending on timeout). This block keyboard driver, which also use common workqueue. To fix problem use custom workqueue in ueagle-atm. Signed-off-by: Stanislaw Gruszka Signed-off-by: Greg Kroah-Hartman --- drivers/usb/atm/ueagle-atm.c | 31 ++++++++++++++++++++----------- 1 file changed, 20 insertions(+), 11 deletions(-) --- a/drivers/usb/atm/ueagle-atm.c +++ b/drivers/usb/atm/ueagle-atm.c @@ -167,6 +167,7 @@ struct uea_softc { union cmv_dsc cmv_dsc; struct work_struct task; + struct workqueue_struct *work_q; u16 pageno; u16 ovl; @@ -1830,7 +1831,7 @@ static int uea_start_reset(struct uea_so /* start loading DSP */ sc->pageno = 0; sc->ovl = 0; - schedule_work(&sc->task); + queue_work(sc->work_q, &sc->task); /* wait for modem ready CMV */ ret = wait_cmv_ack(sc); @@ -2038,13 +2039,13 @@ static void uea_schedule_load_page_e1(st { sc->pageno = intr->e1_bSwapPageNo; sc->ovl = intr->e1_bOvl >> 4 | intr->e1_bOvl << 4; - schedule_work(&sc->task); + queue_work(sc->work_q, &sc->task); } static void uea_schedule_load_page_e4(struct uea_softc *sc, struct intr_pkt *intr) { sc->pageno = intr->e4_bSwapPageNo; - schedule_work(&sc->task); + queue_work(sc->work_q, &sc->task); } /* @@ -2117,6 +2118,13 @@ static int uea_boot(struct uea_softc *sc init_waitqueue_head(&sc->sync_q); init_waitqueue_head(&sc->cmv_ack_wait); + sc->work_q = create_workqueue("ueagle-dsp"); + if (!sc->work_q) { + uea_err(INS_TO_USBDEV(sc), "cannot allocate workqueue\n"); + uea_leaves(INS_TO_USBDEV(sc)); + return -ENOMEM; + } + if (UEA_CHIP_VERSION(sc) == ADI930) load_XILINX_firmware(sc); @@ -2124,14 +2132,13 @@ static int uea_boot(struct uea_softc *sc if (!intr) { uea_err(INS_TO_USBDEV(sc), "cannot allocate interrupt package\n"); - uea_leaves(INS_TO_USBDEV(sc)); - return -ENOMEM; + goto err0; } sc->urb_int = usb_alloc_urb(0, GFP_KERNEL); if (!sc->urb_int) { uea_err(INS_TO_USBDEV(sc), "cannot allocate interrupt URB\n"); - goto err; + goto err1; } usb_fill_int_urb(sc->urb_int, sc->usb_dev, @@ -2144,7 +2151,7 @@ static int uea_boot(struct uea_softc *sc if (ret < 0) { uea_err(INS_TO_USBDEV(sc), "urb submition failed with error %d\n", ret); - goto err; + goto err1; } sc->kthread = kthread_run(uea_kthread, sc, "ueagle-atm"); @@ -2158,10 +2165,12 @@ static int uea_boot(struct uea_softc *sc err2: usb_kill_urb(sc->urb_int); -err: +err1: usb_free_urb(sc->urb_int); sc->urb_int = NULL; kfree(intr); +err0: + destroy_workqueue(sc->work_q); uea_leaves(INS_TO_USBDEV(sc)); return -ENOMEM; } @@ -2176,15 +2185,15 @@ static void uea_stop(struct uea_softc *s ret = kthread_stop(sc->kthread); uea_dbg(INS_TO_USBDEV(sc), "kthread finish with status %d\n", ret); - /* stop any pending boot process */ - flush_scheduled_work(); - uea_request(sc, UEA_SET_MODE, UEA_LOOPBACK_ON, 0, NULL); usb_kill_urb(sc->urb_int); kfree(sc->urb_int->transfer_buffer); usb_free_urb(sc->urb_int); + /* stop any pending boot process, when no one can schedule work */ + destroy_workqueue(sc->work_q); + if (sc->dsp_firm) release_firmware(sc->dsp_firm); uea_leaves(INS_TO_USBDEV(sc));