From 03e29974ff761cf4d88542274e376450c2bb79ba Mon Sep 17 00:00:00 2001 From: Pierre-Louis Bossart Date: Fri, 24 May 2019 14:09:19 -0500 Subject: [PATCH] UPSTREAM: ASoC: SOF: core: fix error handling with the probe workqueue In some configurations, it's a requirement to split the probe in two, with a second part handled in a workqueue (e.g. for HDMI support which depends on the DRM modules). SOF already handles these configurations but the error flow is incorrect. When an error occurs in the workqueue, the probe has technically already completed. If we release the resources on errors, this generates kernel oops/use-after-free when the resources are released a second time on module removal. GitHub issue: https://github.com/thesofproject/linux/issues/945 Fixes: c16211d6226 ("ASoC: SOF: Add Sound Open Firmware driver core") Reviewed-by: Takashi Iwai Signed-off-by: Pierre-Louis Bossart Signed-off-by: Mark Brown (cherry picked from commit 0bce512e784d137700275f7839c4547eddbd4b6a) BUG=b:135490563 TEST=Test Audio use cases for GLK with full SOF patch series applied. Signed-off-by: Curtis Malainey --- sound/soc/sof/core.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/sound/soc/sof/core.c b/sound/soc/sof/core.c index b2d8642b329ea0..93c5be883f2f66 100644 --- a/sound/soc/sof/core.c +++ b/sound/soc/sof/core.c @@ -393,6 +393,7 @@ static int sof_probe_continue(struct snd_sof_dev *sdev) return 0; +#if !IS_ENABLED(CONFIG_SND_SOC_SOF_PROBE_WORK_QUEUE) fw_run_err: snd_sof_fw_unload(sdev); fw_load_err: @@ -401,6 +402,21 @@ static int sof_probe_continue(struct snd_sof_dev *sdev) snd_sof_free_debug(sdev); dbg_err: snd_sof_remove(sdev); +#else + + /* + * when the probe_continue is handled in a work queue, the + * probe does not fail so we don't release resources here. + * They will be released with an explicit call to + * snd_sof_device_remove() when the PCI/ACPI device is removed + */ + +fw_run_err: +fw_load_err: +ipc_err: +dbg_err: + +#endif return ret; }