Messages in this thread Patch in this message | | | Date | Tue, 9 Sep 2003 12:30:13 +0200 | From | Mikael Pettersson <> | Subject | [PATCH][2.4.23-pre3] fix networking hangs at suspend/resume |
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Since upgrading my laptop from 2.4.23-pre2 to -pre3 it started hanging hard in conjunction with APM suspend or resume. Typically the hang occurs after 2-3 suspend/resume cycles.
After two days of working through the 2.4.23-pre2 -> 2.4.23-pre3 patch piece by piece, I traced it to this change:
> Jeff Garzik: > o [NET] move netif_* helpers from tg3 driver to linux/netdevice.h
A while-test_bit in net/core/dev.c was replaced (indirectly via a new inline function) by a while-test_and_set_bit. This is not correct in general, and in this code triggers semi-random hangs at suspend or resume. I've not seen any hangs at other times, however.
This patch reverts the broken part of the cleanup.
/Mikael
--- linux-2.4.23-pre3/net/core/dev.c.~1~ 2003-09-09 02:01:08.000000000 +0200 +++ linux-2.4.23-pre3/net/core/dev.c 2003-09-09 02:02:00.000000000 +0200 @@ -851,7 +851,11 @@ * engine, but this requires more changes in devices. */ smp_mb__after_clear_bit(); /* Commit netif_running(). */ - netif_poll_disable(dev); + while (test_bit(__LINK_STATE_RX_SCHED, &dev->state)) { + /* No hurry. */ + current->state = TASK_INTERRUPTIBLE; + schedule_timeout(1); + } /* * Call the device specific close. This cannot fail. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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