diff mbox

[1/4] DMA: PL330: fix locking in pl330_free_chan_resources()

Message ID 1351504796-24788-2-git-send-email-b.zolnierkie@samsung.com (mailing list archive)
State New, archived
Headers show

Commit Message

Bartlomiej Zolnierkiewicz Oct. 29, 2012, 9:59 a.m. UTC
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@gmail.com>
Cc: Vinod Koul <vinod.koul@linux.intel.com>
Cc: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
---
 drivers/dma/pl330.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Comments

Jassi Brar Oct. 29, 2012, 9:48 p.m. UTC | #1
On Mon, Oct 29, 2012 at 10:59 AM, Bartlomiej Zolnierkiewicz
<b.zolnierkie@samsung.com> 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@gmail.com>
> Cc: Vinod Koul <vinod.koul@linux.intel.com>
> Cc: Tomasz Figa <t.figa@samsung.com>
> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
> ---
>  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@gmail.com>
Bartlomiej Zolnierkiewicz Nov. 30, 2012, 10:59 a.m. UTC | #2
On Monday 29 October 2012 22:48:05 Jassi Brar wrote:
> On Mon, Oct 29, 2012 at 10:59 AM, Bartlomiej Zolnierkiewicz
> <b.zolnierkie@samsung.com> 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@gmail.com>
> > Cc: Vinod Koul <vinod.koul@linux.intel.com>
> > Cc: Tomasz Figa <t.figa@samsung.com>
> > Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
> > Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
> > ---
> >  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@gmail.com>

Vinod/Dan could you please pick this patch for 3.8?  Thanks!

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung Poland R&D Center
Vinod Koul Nov. 30, 2012, 6:07 p.m. UTC | #3
On Fri, 2012-11-30 at 11:59 +0100, Bartlomiej Zolnierkiewicz wrote:
> > Acked-by: Jassi Brar <jassisinghbrar@gmail.com>
> 
> Vinod/Dan could you please pick this patch for 3.8?  Thanks!
I will check and queue it up today
Bartlomiej Zolnierkiewicz Dec. 12, 2012, 3:08 p.m. UTC | #4
On Friday 30 November 2012 19:07:53 Vinod Koul wrote:
> On Fri, 2012-11-30 at 11:59 +0100, Bartlomiej Zolnierkiewicz wrote:
> > > Acked-by: Jassi Brar <jassisinghbrar@gmail.com>
> > 
> > Vinod/Dan could you please pick this patch for 3.8?  Thanks!
> I will check and queue it up today

ping?  [ I can't find the patch in slave-dma.git tree. ]

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung Poland R&D Center
diff mbox

Patch

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;