Hello Alan Stern,
The patch b35c5009bbf6: "USB: EHCI: create per-TT bandwidth tables"
from Oct 11, 2013, leads to the following
static checker warning: "drivers/usb/host/ehci-sched.c:1377
reserve_release_iso_bandwidth()
error: 'tt' dereferencing possible ERR_PTR()"
drivers/usb/host/ehci-sched.c
1375 tt = find_tt(stream->ps.udev);
^^^^^^^^^^^^^^^^^^^^^^^^
This can return ERR_PTR(-ENOMEM).
1376 if (sign > 0)
1377 list_add_tail(&stream->ps.ps_list,
&tt->ps_list);
1378 else
1379 list_del(&stream->ps.ps_list);
1380
1381 for (i = uframe >> 3; i < EHCI_BANDWIDTH_FRAMES;
1382 i += stream->ps.bw_period)
1383 tt->bandwidth[i] += tt_usecs;
Also:
drivers/usb/host/ehci-sched.c
257 /* FS/LS bus bandwidth */
258 if (tt_usecs) {
259 tt = find_tt(qh->ps.udev);
^^^^^^^^^^^^^^^^^^^^^^^^
260 if (sign > 0)
261 list_add_tail(&qh->ps.ps_list, &tt->ps_list);
262 else
263 list_del(&qh->ps.ps_list);
264
265 for (i = start_uf >> 3; i < EHCI_BANDWIDTH_FRAMES;
266 i += qh->ps.bw_period)
267 tt->bandwidth[i] += tt_usecs;
regards,
dan carpenter
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