[PATCH v1 1/2] ALSA: hda: cs35l41: Call put_device() in the scope of get_device()
When put_device() is called in another function it's hard to realize that and easy to "fix" the code in a wrong way. Instead, move put_device() to be in the same scope as get_device(), so we prevent appearance of any attempts to "fix" the code.
Signed-off-by: Andy Shevchenko andriy.shevchenko@linux.intel.com --- sound/pci/hda/cs35l41_hda.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/sound/pci/hda/cs35l41_hda.c b/sound/pci/hda/cs35l41_hda.c index 15e2a0009080..12e955931044 100644 --- a/sound/pci/hda/cs35l41_hda.c +++ b/sound/pci/hda/cs35l41_hda.c @@ -1154,7 +1154,6 @@ static int cs35l41_no_acpi_dsd(struct cs35l41_hda *cs35l41, struct device *physd hw_cfg->gpio2.func = CS35L41_INTERRUPT; hw_cfg->gpio2.valid = true; hw_cfg->valid = true; - put_device(physdev);
if (strncmp(hid, "CLSA0100", 8) == 0) { hw_cfg->bst_type = CS35L41_EXT_BOOST_NO_VSPK_SWITCH; @@ -1204,9 +1203,10 @@ static int cs35l41_hda_read_acpi(struct cs35l41_hda *cs35l41, const char *hid, i
property = "cirrus,dev-index"; ret = device_property_count_u32(physdev, property); - if (ret <= 0) - return cs35l41_no_acpi_dsd(cs35l41, physdev, id, hid); - + if (ret <= 0) { + ret = cs35l41_no_acpi_dsd(cs35l41, physdev, id, hid); + goto err_put_physdev; + } if (ret > ARRAY_SIZE(values)) { ret = -EINVAL; goto err; @@ -1295,8 +1295,9 @@ static int cs35l41_hda_read_acpi(struct cs35l41_hda *cs35l41, const char *hid, i return 0;
err: - put_device(physdev); dev_err(cs35l41->dev, "Failed property %s: %d\n", property, ret); +err_put_physdev: + put_device(physdev);
return ret; }
Replace open coded variant of recently introduced acpi_get_subsystem_id().
Signed-off-by: Andy Shevchenko andriy.shevchenko@linux.intel.com --- sound/pci/hda/cs35l41_hda.c | 46 ++++++++----------------------------- 1 file changed, 9 insertions(+), 37 deletions(-)
diff --git a/sound/pci/hda/cs35l41_hda.c b/sound/pci/hda/cs35l41_hda.c index 12e955931044..3952f2853703 100644 --- a/sound/pci/hda/cs35l41_hda.c +++ b/sound/pci/hda/cs35l41_hda.c @@ -842,8 +842,8 @@ static int cs35l41_hda_bind(struct device *dev, struct device *master, void *mas
comps->dev = dev; if (!cs35l41->acpi_subsystem_id) - cs35l41->acpi_subsystem_id = devm_kasprintf(dev, GFP_KERNEL, "%.8x", - comps->codec->core.subsystem_id); + cs35l41->acpi_subsystem_id = kasprintf(GFP_KERNEL, "%.8x", + comps->codec->core.subsystem_id); cs35l41->codec = comps->codec; strscpy(comps->name, dev_name(dev), sizeof(comps->name));
@@ -1048,36 +1048,6 @@ static int cs35l41_hda_apply_properties(struct cs35l41_hda *cs35l41) return cs35l41_hda_channel_map(cs35l41->dev, 0, NULL, 1, &hw_cfg->spk_pos); }
-static int cs35l41_get_acpi_sub_string(struct device *dev, struct acpi_device *adev, - const char **subsysid) -{ - struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; - union acpi_object *obj; - acpi_status status; - int ret = 0; - - status = acpi_evaluate_object(adev->handle, "_SUB", NULL, &buffer); - if (ACPI_SUCCESS(status)) { - obj = buffer.pointer; - if (obj->type == ACPI_TYPE_STRING) { - *subsysid = devm_kstrdup(dev, obj->string.pointer, GFP_KERNEL); - if (*subsysid == NULL) { - dev_err(dev, "Cannot allocate Subsystem ID"); - ret = -ENOMEM; - } - } else { - dev_warn(dev, "Warning ACPI _SUB did not return a string\n"); - ret = -ENODEV; - } - acpi_os_free(buffer.pointer); - } else { - dev_dbg(dev, "Warning ACPI _SUB failed: %#x\n", status); - ret = -ENODEV; - } - - return ret; -} - static int cs35l41_get_speaker_id(struct device *dev, int amp_index, int num_amps, int fixed_gpio_id) { @@ -1182,6 +1152,7 @@ static int cs35l41_hda_read_acpi(struct cs35l41_hda *cs35l41, const char *hid, i u32 values[HDA_MAX_COMPONENTS]; struct acpi_device *adev; struct device *physdev; + const char *sub; char *property; size_t nval; int i, ret; @@ -1195,11 +1166,10 @@ static int cs35l41_hda_read_acpi(struct cs35l41_hda *cs35l41, const char *hid, i physdev = get_device(acpi_get_first_physical_node(adev)); acpi_dev_put(adev);
- ret = cs35l41_get_acpi_sub_string(cs35l41->dev, adev, &cs35l41->acpi_subsystem_id); - if (ret) - dev_info(cs35l41->dev, "No Subsystem ID found in ACPI: %d", ret); - else - dev_dbg(cs35l41->dev, "Subsystem ID %s found", cs35l41->acpi_subsystem_id); + sub = acpi_get_subsystem_id(ACPI_HANDLE(physdev)); + if (IS_ERR(sub)) + sub = NULL; + cs35l41->acpi_subsystem_id = sub;
property = "cirrus,dev-index"; ret = device_property_count_u32(physdev, property); @@ -1434,6 +1404,7 @@ int cs35l41_hda_probe(struct device *dev, const char *device_name, int id, int i if (cs35l41_safe_reset(cs35l41->regmap, cs35l41->hw_cfg.bst_type)) gpiod_set_value_cansleep(cs35l41->reset_gpio, 0); gpiod_put(cs35l41->reset_gpio); + kfree(cs35l41->acpi_subsystem_id);
return ret; } @@ -1456,6 +1427,7 @@ void cs35l41_hda_remove(struct device *dev) if (cs35l41_safe_reset(cs35l41->regmap, cs35l41->hw_cfg.bst_type)) gpiod_set_value_cansleep(cs35l41->reset_gpio, 0); gpiod_put(cs35l41->reset_gpio); + kfree(cs35l41->acpi_subsystem_id); } EXPORT_SYMBOL_NS_GPL(cs35l41_hda_remove, SND_HDA_SCODEC_CS35L41);
On Mon, 05 Sep 2022 18:58:25 +0200, Andy Shevchenko wrote:
When put_device() is called in another function it's hard to realize that and easy to "fix" the code in a wrong way. Instead, move put_device() to be in the same scope as get_device(), so we prevent appearance of any attempts to "fix" the code.
Signed-off-by: Andy Shevchenko andriy.shevchenko@linux.intel.com
Applied both patches now. Thanks.
Takashi
participants (2)
-
Andy Shevchenko -
Takashi Iwai