diff options
| author | Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> | 2015-05-21 03:50:23 +0000 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2015-05-22 14:15:26 +0100 |
| commit | 02299d9875bab5b1e9d87ce9ae4aecf537eb12a4 (patch) | |
| tree | fd8540f53112e7ed217aa6d95b2b9047a25af101 /sound/soc/sh/rcar/ssi.c | |
| parent | e8a07d60c932efbd44bee50e3fa95f133b8c28be (diff) | |
ASoC: rsnd: spin lock for interrupt handler
Renesas R-Car driver interrupt handler was not locked before.
But now, SSI/SRC interrupt handler calls restart function
which should be called under spin lock.
Below error might happen witout this patch.
Unable to handle kernel NULL pointer dereference at virtual address 00000048
pgd = edfac000
[00000048] *pgd=6e0f0831, *pte=00000000, *ppte=00000000
Internal error: Oops: 17 [#1] SMP ARM
CPU: 0 PID: 2009 Comm: aplay Not tainted 4.1.0-rc2-dirty #4
Hardware name: Generic R8A7790 (Flattened Device Tree)
task: eeac9040 ti: eebe8000 task.ti: eebe8000
PC is at rsnd_get_adinr+0x28/0x60
LR is at rsnd_src_ssiu_start+0xdc/0x19c
pc : [<c0409790>] lr : [<c040c068>] psr: a0000193
sp : eebe9e58 ip : eebe9e68 fp : eebe9e64
r10: c06ed9d0 r9 : ee919d10 r8 : 00000001
r7 : 00000001 r6 : ee1cb090 r5 : 00000000 r4 : edcaa418
r3 : 00000000 r2 : eea8ce00 r1 : 80000193 r0 : edcaa418
...
Reported-by: Cao Minh Hiep <cm-hiep@jinso.co.jp>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Tested-by: Keita Kobayashi <keita.kobayashi.ym@renesas.com>
Tested by: Cao Minh Hiep <cm-hiep@jinso.co.jp>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/soc/sh/rcar/ssi.c')
| -rw-r--r-- | sound/soc/sh/rcar/ssi.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/sound/soc/sh/rcar/ssi.c b/sound/soc/sh/rcar/ssi.c index 927ac52a6d1e..50fa3928a003 100644 --- a/sound/soc/sh/rcar/ssi.c +++ b/sound/soc/sh/rcar/ssi.c @@ -423,10 +423,15 @@ static irqreturn_t rsnd_ssi_interrupt(int irq, void *data) struct rsnd_priv *priv = rsnd_mod_to_priv(mod); struct rsnd_dai_stream *io = rsnd_mod_to_io(mod); int is_dma = rsnd_ssi_is_dma_mode(mod); - u32 status = rsnd_mod_read(mod, SSISR); + u32 status; + + spin_lock(&priv->lock); - if (!io) - return IRQ_NONE; + /* ignore all cases if not working */ + if (!rsnd_mod_is_working(mod)) + goto rsnd_ssi_interrupt_out; + + status = rsnd_mod_read(mod, SSISR); /* PIO only */ if (!is_dma && (status & DIRQ)) { @@ -466,6 +471,9 @@ static irqreturn_t rsnd_ssi_interrupt(int irq, void *data) rsnd_ssi_record_error(ssi, status); +rsnd_ssi_interrupt_out: + spin_unlock(&priv->lock); + return IRQ_HANDLED; } |