On Mon, Oct 29, 2012 at 10:59 AM, Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx> wrote: > tasklet_kill() may sleep so call it before taking pch->lock. > > Fixes following lockup: > > [ 345.470000] BUG: scheduling while atomic: cat/2383/0x00000002 > [ 345.470000] Modules linked in: > [ 345.470000] [<c0015858>] (unwind_backtrace+0x0/0xfc) from [<c004d980>] (__schedule_bug+0x4c/0x58) > [ 345.470000] [<c004d980>] (__schedule_bug+0x4c/0x58) from [<c0360b6c>] (__schedule+0x690/0x6e0) > [ 345.470000] [<c0360b6c>] (__schedule+0x690/0x6e0) from [<c004f2b4>] (sys_sched_yield+0x70/0x78) > [ 345.470000] [<c004f2b4>] (sys_sched_yield+0x70/0x78) from [<c002acec>] (tasklet_kill+0x34/0x8c) > [ 345.470000] [<c002acec>] (tasklet_kill+0x34/0x8c) from [<c01da4cc>] (pl330_free_chan_resources+0x24/0x88) > [ 345.470000] [<c01da4cc>] (pl330_free_chan_resources+0x24/0x88) from [<c01d81f4>] (dma_chan_put+0x4c/0x50) > [ 345.470000] [<c01d81f4>] (dma_chan_put+0x4c/0x50) from [<c01d82c0>] (dma_release_channel+0x28/0x98) > [...] > [ 368.335000] BUG: spinlock lockup suspected on CPU#0, swapper/0/0 > [ 368.340000] lock: 0xe52aa04c, .magic: dead4ead, .owner: cat/2383, .owner_cpu: 1 > [ 368.350000] [<c0015858>] (unwind_backtrace+0x0/0xfc) from [<c01b3d78>] (do_raw_spin_lock+0x194/0x204) > [ 368.360000] [<c01b3d78>] (do_raw_spin_lock+0x194/0x204) from [<c0361adc>] (_raw_spin_lock_irqsave+0x20/0x28) > [ 368.365000] [<c0361adc>] (_raw_spin_lock_irqsave+0x20/0x28) from [<c01da80c>] (pl330_tasklet+0x2c/0x5a8) > [ 368.375000] [<c01da80c>] (pl330_tasklet+0x2c/0x5a8) from [<c002ac04>] (tasklet_action+0xfc/0x114) > [ 368.385000] [<c002ac04>] (tasklet_action+0xfc/0x114) from [<c002b204>] (__do_softirq+0xe4/0x19c) > [ 368.395000] [<c002b204>] (__do_softirq+0xe4/0x19c) from [<c002b398>] (irq_exit+0x98/0x9c) > [ 368.405000] [<c002b398>] (irq_exit+0x98/0x9c) from [<c0013ebc>] (handle_IPI+0x124/0x16c) > [ 368.410000] [<c0013ebc>] (handle_IPI+0x124/0x16c) from [<c000857c>] (gic_handle_irq+0x64/0x68) > [ 368.420000] [<c000857c>] (gic_handle_irq+0x64/0x68) from [<c000e740>] (__irq_svc+0x40/0x70) > [ 368.430000] Exception stack(0xc04a3f00 to 0xc04a3f48) > [ 368.435000] 3f00: c04a3f48 00000000 6f9e23e8 00000050 c07492c8 c04a3f48 00000000 c04ccc88 > [ 368.440000] 3f20: 6f9dbac3 00000050 6f9e23e8 00000050 3b9aca00 c04a3f48 c005cfa4 c02946d4 > [ 368.450000] 3f40: 60000013 ffffffff > [ 368.455000] [<c000e740>] (__irq_svc+0x40/0x70) from [<c02946d4>] (cpuidle_wrap_enter+0x4c/0xa0) > [ 368.460000] [<c02946d4>] (cpuidle_wrap_enter+0x4c/0xa0) from [<c02940dc>] (cpuidle_enter_state+0x18/0x68) > [ 368.470000] [<c02940dc>] (cpuidle_enter_state+0x18/0x68) from [<c02948e0>] (cpuidle_idle_call+0xac/0xe0) > [ 368.480000] [<c02948e0>] (cpuidle_idle_call+0xac/0xe0) from [<c00102f8>] (cpu_idle+0xac/0xf0) > [ 368.490000] [<c00102f8>] (cpu_idle+0xac/0xf0) from [<c04796a0>] (start_kernel+0x28c/0x294) > > Cc: Jassi Brar <jassisinghbrar@xxxxxxxxx> > Cc: Vinod Koul <vinod.koul@xxxxxxxxxxxxxxx> > Cc: Tomasz Figa <t.figa@xxxxxxxxxxx> > Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx> > Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx> > --- > drivers/dma/pl330.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c > index 665668b..db7574b 100644 > --- a/drivers/dma/pl330.c > +++ b/drivers/dma/pl330.c > @@ -2459,10 +2459,10 @@ static void pl330_free_chan_resources(struct dma_chan *chan) > struct dma_pl330_chan *pch = to_pchan(chan); > unsigned long flags; > > - spin_lock_irqsave(&pch->lock, flags); > - > tasklet_kill(&pch->task); > > + spin_lock_irqsave(&pch->lock, flags); > + > pl330_release_channel(pch->pl330_chid); > pch->pl330_chid = NULL; > Thanks. Acked-by: Jassi Brar <jassisinghbrar@xxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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