Commit a6d0744b authored by Takashi Iwai's avatar Takashi Iwai Committed by Sasha Levin

ASoC: intel: Fix crash at suspend/resume without card registration

[ Upstream commit 2fc995a8 ]

When ASoC Intel SST Medfield driver is probed but without codec / card
assigned, it causes an Oops and freezes the kernel at suspend/resume,

 PM: Suspending system (freeze)
 Suspending console(s) (use no_console_suspend to debug)
 BUG: unable to handle kernel NULL pointer dereference at 0000000000000018
 IP: [<ffffffffc09d9409>] sst_soc_prepare+0x19/0xa0 [snd_soc_sst_mfld_platform]
 Oops: 0000 [#1] PREEMPT SMP
 CPU: 0 PID: 1552 Comm: systemd-sleep Tainted: G W 4.9.0-rc6-1.g5f5c2ad-default #1
 Call Trace:
  [<ffffffffb45318f9>] dpm_prepare+0x209/0x460
  [<ffffffffb4531b61>] dpm_suspend_start+0x11/0x60
  [<ffffffffb40d3cc2>] suspend_devices_and_enter+0xb2/0x710
  [<ffffffffb40d462e>] pm_suspend+0x30e/0x390
  [<ffffffffb40d2eba>] state_store+0x8a/0x90
  [<ffffffffb43c670f>] kobj_attr_store+0xf/0x20
  [<ffffffffb42b0d97>] sysfs_kf_write+0x37/0x40
  [<ffffffffb42b02bc>] kernfs_fop_write+0x11c/0x1b0
  [<ffffffffb422be68>] __vfs_write+0x28/0x140
  [<ffffffffb43728a8>] ? apparmor_file_permission+0x18/0x20
  [<ffffffffb433b2ab>] ? security_file_permission+0x3b/0xc0
  [<ffffffffb422d095>] vfs_write+0xb5/0x1a0
  [<ffffffffb422e3d6>] SyS_write+0x46/0xa0
  [<ffffffffb4719fbb>] entry_SYSCALL_64_fastpath+0x1e/0xad

Add proper NULL checks in the PM code of mdfld driver.
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
Acked-by: default avatarVinod Koul <vinod.koul@intel.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
parent 90604ed2
...@@ -739,6 +739,9 @@ static int sst_soc_prepare(struct device *dev) ...@@ -739,6 +739,9 @@ static int sst_soc_prepare(struct device *dev)
struct sst_data *drv = dev_get_drvdata(dev); struct sst_data *drv = dev_get_drvdata(dev);
int i; int i;
if (!drv->soc_card)
return 0;
/* suspend all pcms first */ /* suspend all pcms first */
snd_soc_suspend(drv->soc_card->dev); snd_soc_suspend(drv->soc_card->dev);
snd_soc_poweroff(drv->soc_card->dev); snd_soc_poweroff(drv->soc_card->dev);
...@@ -761,6 +764,9 @@ static void sst_soc_complete(struct device *dev) ...@@ -761,6 +764,9 @@ static void sst_soc_complete(struct device *dev)
struct sst_data *drv = dev_get_drvdata(dev); struct sst_data *drv = dev_get_drvdata(dev);
int i; int i;
if (!drv->soc_card)
return;
/* restart SSPs */ /* restart SSPs */
for (i = 0; i < drv->soc_card->num_rtd; i++) { for (i = 0; i < drv->soc_card->num_rtd; i++) {
struct snd_soc_dai *dai = drv->soc_card->rtd[i].cpu_dai; struct snd_soc_dai *dai = drv->soc_card->rtd[i].cpu_dai;
......
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