From: Tilman Schmidt Eliminate some possibilities for user processes writing to the Gigaset character device to be left sleeping indefinitely, by adding wakeup calls to error paths and properly disposing of pending write requests when the device is disconnected. It also removes unnecessary NULL checks before usb_free_urb() and usb_kill_urb() calls. Signed-off-by: Tilman Schmidt Cc: Karsten Keil Signed-off-by: Andrew Morton --- drivers/isdn/gigaset/bas-gigaset.c | 118 +++++++++++---------------- 1 file changed, 52 insertions(+), 66 deletions(-) diff -puN drivers/isdn/gigaset/bas-gigaset.c~isdn-gigaset-fix-possible-missing-wakeup drivers/isdn/gigaset/bas-gigaset.c --- a/drivers/isdn/gigaset/bas-gigaset.c~isdn-gigaset-fix-possible-missing-wakeup +++ a/drivers/isdn/gigaset/bas-gigaset.c @@ -1853,20 +1853,24 @@ static int gigaset_write_cmd(struct card { struct cmdbuf_t *cb; unsigned long flags; - int status; + int rc; gigaset_dbg_buffer(atomic_read(&cs->mstate) != MS_LOCKED ? DEBUG_TRANSCMD : DEBUG_LOCKCMD, "CMD Transmit", len, buf); - if (len <= 0) - return 0; /* nothing to do */ + if (len <= 0) { + /* nothing to do */ + rc = 0; + goto notqueued; + } if (len > IF_WRITEBUF) len = IF_WRITEBUF; if (!(cb = kmalloc(sizeof(struct cmdbuf_t) + len, GFP_ATOMIC))) { dev_err(cs->dev, "%s: out of memory\n", __func__); - return -ENOMEM; + rc = -ENOMEM; + goto notqueued; } memcpy(cb->buf, buf, len); @@ -1891,11 +1895,21 @@ static int gigaset_write_cmd(struct card if (unlikely(!cs->connected)) { spin_unlock_irqrestore(&cs->lock, flags); gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__); + /* flush command queue */ + spin_lock_irqsave(&cs->cmdlock, flags); + while (cs->cmdbuf != NULL) + complete_cb(cs); + spin_unlock_irqrestore(&cs->cmdlock, flags); return -ENODEV; } - status = start_cbsend(cs); + rc = start_cbsend(cs); spin_unlock_irqrestore(&cs->lock, flags); - return status < 0 ? status : len; + return rc < 0 ? rc : len; + +notqueued: /* request handled without queuing */ + if (wake_tasklet) + tasklet_schedule(wake_tasklet); + return rc; } /* gigaset_write_room @@ -1964,20 +1978,15 @@ static int gigaset_freebcshw(struct bc_s /* kill URBs and tasklets before freeing - better safe than sorry */ atomic_set(&ubc->running, 0); - for (i = 0; i < BAS_OUTURBS; ++i) - if (ubc->isoouturbs[i].urb) { - gig_dbg(DEBUG_INIT, "%s: killing iso out URB %d", - __func__, i); - usb_kill_urb(ubc->isoouturbs[i].urb); - usb_free_urb(ubc->isoouturbs[i].urb); - } - for (i = 0; i < BAS_INURBS; ++i) - if (ubc->isoinurbs[i]) { - gig_dbg(DEBUG_INIT, "%s: killing iso in URB %d", - __func__, i); - usb_kill_urb(ubc->isoinurbs[i]); - usb_free_urb(ubc->isoinurbs[i]); - } + gig_dbg(DEBUG_INIT, "%s: killing iso URBs", __func__); + for (i = 0; i < BAS_OUTURBS; ++i) { + usb_kill_urb(ubc->isoouturbs[i].urb); + usb_free_urb(ubc->isoouturbs[i].urb); + } + for (i = 0; i < BAS_INURBS; ++i) { + usb_kill_urb(ubc->isoinurbs[i]); + usb_free_urb(ubc->isoinurbs[i]); + } tasklet_kill(&ubc->sent_tasklet); tasklet_kill(&ubc->rcvd_tasklet); kfree(ubc->isooutbuf); @@ -2099,55 +2108,32 @@ static void freeurbs(struct cardstate *c struct bas_bc_state *ubc; int i, j; + gig_dbg(DEBUG_INIT, "%s: killing URBs", __func__); for (j = 0; j < 2; ++j) { ubc = cs->bcs[j].hw.bas; - for (i = 0; i < BAS_OUTURBS; ++i) - if (ubc->isoouturbs[i].urb) { - usb_kill_urb(ubc->isoouturbs[i].urb); - gig_dbg(DEBUG_INIT, - "%s: isoc output URB %d/%d unlinked", - __func__, j, i); - usb_free_urb(ubc->isoouturbs[i].urb); - ubc->isoouturbs[i].urb = NULL; - } - for (i = 0; i < BAS_INURBS; ++i) - if (ubc->isoinurbs[i]) { - usb_kill_urb(ubc->isoinurbs[i]); - gig_dbg(DEBUG_INIT, - "%s: isoc input URB %d/%d unlinked", - __func__, j, i); - usb_free_urb(ubc->isoinurbs[i]); - ubc->isoinurbs[i] = NULL; - } - } - if (ucs->urb_int_in) { - usb_kill_urb(ucs->urb_int_in); - gig_dbg(DEBUG_INIT, "%s: interrupt input URB unlinked", - __func__); - usb_free_urb(ucs->urb_int_in); - ucs->urb_int_in = NULL; - } - if (ucs->urb_cmd_out) { - usb_kill_urb(ucs->urb_cmd_out); - gig_dbg(DEBUG_INIT, "%s: command output URB unlinked", - __func__); - usb_free_urb(ucs->urb_cmd_out); - ucs->urb_cmd_out = NULL; - } - if (ucs->urb_cmd_in) { - usb_kill_urb(ucs->urb_cmd_in); - gig_dbg(DEBUG_INIT, "%s: command input URB unlinked", - __func__); - usb_free_urb(ucs->urb_cmd_in); - ucs->urb_cmd_in = NULL; - } - if (ucs->urb_ctrl) { - usb_kill_urb(ucs->urb_ctrl); - gig_dbg(DEBUG_INIT, "%s: control output URB unlinked", - __func__); - usb_free_urb(ucs->urb_ctrl); - ucs->urb_ctrl = NULL; + for (i = 0; i < BAS_OUTURBS; ++i) { + usb_kill_urb(ubc->isoouturbs[i].urb); + usb_free_urb(ubc->isoouturbs[i].urb); + ubc->isoouturbs[i].urb = NULL; + } + for (i = 0; i < BAS_INURBS; ++i) { + usb_kill_urb(ubc->isoinurbs[i]); + usb_free_urb(ubc->isoinurbs[i]); + ubc->isoinurbs[i] = NULL; + } } + usb_kill_urb(ucs->urb_int_in); + usb_free_urb(ucs->urb_int_in); + ucs->urb_int_in = NULL; + usb_kill_urb(ucs->urb_cmd_out); + usb_free_urb(ucs->urb_cmd_out); + ucs->urb_cmd_out = NULL; + usb_kill_urb(ucs->urb_cmd_in); + usb_free_urb(ucs->urb_cmd_in); + ucs->urb_cmd_in = NULL; + usb_kill_urb(ucs->urb_ctrl); + usb_free_urb(ucs->urb_ctrl); + ucs->urb_ctrl = NULL; } /* gigaset_probe _