[PATCH 0/7] ALSA: Replace sprintf() with sysfs_emit()

[PATCH 0/7] ALSA: Replace sprintf() with sysfs_emit()

[Takashi Iwai]

Hi,

this is a patch set for rather simple conversions from the plain
sprintf() & co to the new helpers, sysfs_emit() and sysfs_emit_at().
No functional changes are expected.


Takashi

===

Takashi Iwai (7):
  ALSA: ac97: Replace sprintf() with sysfs_emit()
  ALSA: aoa: Replace sprintf() with sysfs_emit()
  ALSA: control-led: Replace sprintf() with sysfs_emit()
  ALSA: core: Replace scnprintf() with sysfs_emit()
  ALSA: pcm: Replace sprintf() with sysfs_emit()
  ALSA: hda: Replace sprintf() with sysfs_emit()
  ALSA: line6: Replace sprintf() with sysfs_emit()

 sound/ac97/bus.c           |  2 +-
 sound/aoa/soundbus/sysfs.c | 22 ++++++++------------
 sound/core/control_led.c   | 29 +++++++++++---------------
 sound/core/init.c          |  4 ++--
 sound/core/pcm.c           |  2 +-
 sound/hda/hdac_sysfs.c     | 42 +++++++++++++++++++-------------------
 sound/pci/hda/hda_sysfs.c  | 23 ++++++++++-----------
 sound/usb/line6/pod.c      |  8 ++++----
 sound/usb/line6/podhd.c    |  4 ++--
 9 files changed, 62 insertions(+), 74 deletions(-)

-- 
2.35.3

[PATCH 1/7] ALSA: ac97: Replace sprintf() with sysfs_emit()

[Takashi Iwai]

For sysfs outputs, it's safer to use a new helper, sysfs_emit(),
instead of the raw sprintf() & co.  This patch replaces the open code
straightforwardly with a new helper.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 sound/ac97/bus.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/ac97/bus.c b/sound/ac97/bus.c
index 0d31a6d71468..045330883a96 100644
--- a/sound/ac97/bus.c
+++ b/sound/ac97/bus.c
@@ -460,7 +460,7 @@ static ssize_t vendor_id_show(struct device *dev,
 {
 	struct ac97_codec_device *codec = to_ac97_device(dev);
 
-	return sprintf(buf, "%08x", codec->vendor_id);
+	return sysfs_emit(buf, "%08x", codec->vendor_id);
 }
 DEVICE_ATTR_RO(vendor_id);
 
-- 
2.35.3

[PATCH 2/7] ALSA: aoa: Replace sprintf() with sysfs_emit()

[Takashi Iwai]

For sysfs outputs, it's safer to use a new helper, sysfs_emit(),
instead of the raw sprintf() & co.  This patch replaces such sprintf()
calls with sysfs_emit() while simplifying the open code in
modalias_show(); as modalias[] is a NUL-terminated string, we can pass
it straightly to a printf() argument.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 sound/aoa/soundbus/sysfs.c | 22 ++++++++--------------
 1 file changed, 8 insertions(+), 14 deletions(-)

diff --git a/sound/aoa/soundbus/sysfs.c b/sound/aoa/soundbus/sysfs.c
index dead3105689b..e87b28428b99 100644
--- a/sound/aoa/soundbus/sysfs.c
+++ b/sound/aoa/soundbus/sysfs.c
@@ -10,19 +10,13 @@ static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
 {
 	struct soundbus_dev *sdev = to_soundbus_device(dev);
 	struct platform_device *of = &sdev->ofdev;
-	int length;
 
-	if (*sdev->modalias) {
-		strscpy(buf, sdev->modalias, sizeof(sdev->modalias) + 1);
-		strcat(buf, "\n");
-		length = strlen(buf);
-	} else {
-		length = sprintf(buf, "of:N%pOFn%c%s\n",
-				 of->dev.of_node, 'T',
-                                 of_node_get_device_type(of->dev.of_node));
-	}
-
-	return length;
+	if (*sdev->modalias)
+		return sysfs_emit(buf, "%s\n", sdev->modalias);
+	else
+		return sysfs_emit(buf, "of:N%pOFn%c%s\n",
+				  of->dev.of_node, 'T',
+				  of_node_get_device_type(of->dev.of_node));
 }
 static DEVICE_ATTR_RO(modalias);
 
@@ -32,7 +26,7 @@ static ssize_t name_show(struct device *dev,
 	struct soundbus_dev *sdev = to_soundbus_device(dev);
 	struct platform_device *of = &sdev->ofdev;
 
-	return sprintf(buf, "%pOFn\n", of->dev.of_node);
+	return sysfs_emit(buf, "%pOFn\n", of->dev.of_node);
 }
 static DEVICE_ATTR_RO(name);
 
@@ -42,7 +36,7 @@ static ssize_t type_show(struct device *dev,
 	struct soundbus_dev *sdev = to_soundbus_device(dev);
 	struct platform_device *of = &sdev->ofdev;
 
-	return sprintf(buf, "%s\n", of_node_get_device_type(of->dev.of_node));
+	return sysfs_emit(buf, "%s\n", of_node_get_device_type(of->dev.of_node));
 }
 static DEVICE_ATTR_RO(type);
 
-- 
2.35.3

[PATCH 3/7] ALSA: control-led: Replace sprintf() with sysfs_emit()

[Takashi Iwai]

For sysfs outputs, it's safer to use a new helper, sysfs_emit(),
instead of the raw sprintf() & co.  This patch replaces such sprintf()
calls with sysfs_emit() while simplifying the open code in
list_show().

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 sound/core/control_led.c | 29 ++++++++++++-----------------
 1 file changed, 12 insertions(+), 17 deletions(-)

diff --git a/sound/core/control_led.c b/sound/core/control_led.c
index 207828f30983..f975cc85772b 100644
--- a/sound/core/control_led.c
+++ b/sound/core/control_led.c
@@ -405,7 +405,7 @@ static ssize_t mode_show(struct device *dev,
 	case MODE_ON:		str = "on"; break;
 	case MODE_OFF:		str = "off"; break;
 	}
-	return sprintf(buf, "%s\n", str);
+	return sysfs_emit(buf, "%s\n", str);
 }
 
 static ssize_t mode_store(struct device *dev,
@@ -443,7 +443,7 @@ static ssize_t brightness_show(struct device *dev,
 {
 	struct snd_ctl_led *led = container_of(dev, struct snd_ctl_led, dev);
 
-	return sprintf(buf, "%u\n", ledtrig_audio_get(led->trigger_type));
+	return sysfs_emit(buf, "%u\n", ledtrig_audio_get(led->trigger_type));
 }
 
 static DEVICE_ATTR_RW(mode);
@@ -618,8 +618,7 @@ static ssize_t list_show(struct device *dev,
 	struct snd_ctl_led_card *led_card = container_of(dev, struct snd_ctl_led_card, dev);
 	struct snd_card *card;
 	struct snd_ctl_led_ctl *lctl;
-	char *buf2 = buf;
-	size_t l;
+	size_t l = 0;
 
 	card = snd_card_ref(led_card->number);
 	if (!card)
@@ -627,23 +626,19 @@ static ssize_t list_show(struct device *dev,
 	down_read(&card->controls_rwsem);
 	mutex_lock(&snd_ctl_led_mutex);
 	if (snd_ctl_led_card_valid[led_card->number]) {
-		list_for_each_entry(lctl, &led_card->led->controls, list)
-			if (lctl->card == card) {
-				if (buf2 - buf > PAGE_SIZE - 16)
-					break;
-				if (buf2 != buf)
-					*buf2++ = ' ';
-				l = scnprintf(buf2, 15, "%u",
-						lctl->kctl->id.numid +
-							lctl->index_offset);
-				buf2[l] = '\0';
-				buf2 += l + 1;
-			}
+		list_for_each_entry(lctl, &led_card->led->controls, list) {
+			if (lctl->card != card)
+				continue;
+			if (l)
+				l += sysfs_emit_at(buf, l, " ");
+			l += sysfs_emit_at(buf, l, "%u",
+					   lctl->kctl->id.numid + lctl->index_offset);
+		}
 	}
 	mutex_unlock(&snd_ctl_led_mutex);
 	up_read(&card->controls_rwsem);
 	snd_card_unref(card);
-	return buf2 - buf;
+	return l;
 }
 
 static DEVICE_ATTR_WO(attach);
-- 
2.35.3

[PATCH 4/7] ALSA: core: Replace scnprintf() with sysfs_emit()

[Takashi Iwai]

sysfs_emit() is a new helper to simplify the sysfs string output.
Replace the open-code with this new helper.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 sound/core/init.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sound/core/init.c b/sound/core/init.c
index 3ac95c66a4b5..193dae361fac 100644
--- a/sound/core/init.c
+++ b/sound/core/init.c
@@ -784,7 +784,7 @@ static ssize_t id_show(struct device *dev,
 		       struct device_attribute *attr, char *buf)
 {
 	struct snd_card *card = container_of(dev, struct snd_card, card_dev);
-	return scnprintf(buf, PAGE_SIZE, "%s\n", card->id);
+	return sysfs_emit(buf, "%s\n", card->id);
 }
 
 static ssize_t id_store(struct device *dev, struct device_attribute *attr,
@@ -822,7 +822,7 @@ static ssize_t number_show(struct device *dev,
 			   struct device_attribute *attr, char *buf)
 {
 	struct snd_card *card = container_of(dev, struct snd_card, card_dev);
-	return scnprintf(buf, PAGE_SIZE, "%i\n", card->number);
+	return sysfs_emit(buf, "%i\n", card->number);
 }
 
 static DEVICE_ATTR_RO(number);
-- 
2.35.3

[PATCH 5/7] ALSA: pcm: Replace sprintf() with sysfs_emit()

[Takashi Iwai]

For sysfs outputs, it's safer to use a new helper, sysfs_emit(),
instead of the raw sprintf() & co.  This patch replaces such a
sprintf() call straightforwardly with the new helper.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 sound/core/pcm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/core/pcm.c b/sound/core/pcm.c
index 2ac742035310..82925709fa12 100644
--- a/sound/core/pcm.c
+++ b/sound/core/pcm.c
@@ -1031,7 +1031,7 @@ static ssize_t pcm_class_show(struct device *dev,
 		str = "none";
 	else
 		str = strs[pcm->dev_class];
-	return sprintf(buf, "%s\n", str);
+	return sysfs_emit(buf, "%s\n", str);
 }
 
 static DEVICE_ATTR_RO(pcm_class);
-- 
2.35.3

[PATCH 6/7] ALSA: hda: Replace sprintf() with sysfs_emit()

[Takashi Iwai]

For sysfs outputs, it's safer to use a new helper, sysfs_emit(),
instead of the raw sprintf() & co.  This patch replaces those usages
straightforwardly with new helpers, sysfs_emit() and sysfs_emit_at().

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 sound/hda/hdac_sysfs.c    | 42 +++++++++++++++++++--------------------
 sound/pci/hda/hda_sysfs.c | 23 ++++++++++-----------
 2 files changed, 32 insertions(+), 33 deletions(-)

diff --git a/sound/hda/hdac_sysfs.c b/sound/hda/hdac_sysfs.c
index 0d7771fca9f0..e47de49a32e3 100644
--- a/sound/hda/hdac_sysfs.c
+++ b/sound/hda/hdac_sysfs.c
@@ -22,7 +22,7 @@ static ssize_t type##_show(struct device *dev,			\
 			   char *buf)				\
 {								\
 	struct hdac_device *codec = dev_to_hdac_dev(dev);	\
-	return sprintf(buf, "0x%x\n", codec->type);		\
+	return sysfs_emit(buf, "0x%x\n", codec->type);		\
 } \
 static DEVICE_ATTR_RO(type)
 
@@ -32,8 +32,8 @@ static ssize_t type##_show(struct device *dev,			\
 					char *buf)		\
 {								\
 	struct hdac_device *codec = dev_to_hdac_dev(dev);	\
-	return sprintf(buf, "%s\n",				\
-		       codec->type ? codec->type : "");		\
+	return sysfs_emit(buf, "%s\n",				\
+			  codec->type ? codec->type : "");	\
 } \
 static DEVICE_ATTR_RO(type)
 
@@ -161,7 +161,7 @@ static struct kobj_type widget_ktype = {
 static ssize_t caps_show(struct hdac_device *codec, hda_nid_t nid,
 			struct widget_attribute *attr, char *buf)
 {
-	return sprintf(buf, "0x%08x\n", get_wcaps(codec, nid));
+	return sysfs_emit(buf, "0x%08x\n", get_wcaps(codec, nid));
 }
 
 static ssize_t pin_caps_show(struct hdac_device *codec, hda_nid_t nid,
@@ -169,8 +169,8 @@ static ssize_t pin_caps_show(struct hdac_device *codec, hda_nid_t nid,
 {
 	if (get_wcaps_type(get_wcaps(codec, nid)) != AC_WID_PIN)
 		return 0;
-	return sprintf(buf, "0x%08x\n",
-		       snd_hdac_read_parm(codec, nid, AC_PAR_PIN_CAP));
+	return sysfs_emit(buf, "0x%08x\n",
+			  snd_hdac_read_parm(codec, nid, AC_PAR_PIN_CAP));
 }
 
 static ssize_t pin_cfg_show(struct hdac_device *codec, hda_nid_t nid,
@@ -182,7 +182,7 @@ static ssize_t pin_cfg_show(struct hdac_device *codec, hda_nid_t nid,
 		return 0;
 	if (snd_hdac_read(codec, nid, AC_VERB_GET_CONFIG_DEFAULT, 0, &val))
 		return 0;
-	return sprintf(buf, "0x%08x\n", val);
+	return sysfs_emit(buf, "0x%08x\n", val);
 }
 
 static bool has_pcm_cap(struct hdac_device *codec, hda_nid_t nid)
@@ -203,8 +203,8 @@ static ssize_t pcm_caps_show(struct hdac_device *codec, hda_nid_t nid,
 {
 	if (!has_pcm_cap(codec, nid))
 		return 0;
-	return sprintf(buf, "0x%08x\n",
-		       snd_hdac_read_parm(codec, nid, AC_PAR_PCM));
+	return sysfs_emit(buf, "0x%08x\n",
+			  snd_hdac_read_parm(codec, nid, AC_PAR_PCM));
 }
 
 static ssize_t pcm_formats_show(struct hdac_device *codec, hda_nid_t nid,
@@ -212,8 +212,8 @@ static ssize_t pcm_formats_show(struct hdac_device *codec, hda_nid_t nid,
 {
 	if (!has_pcm_cap(codec, nid))
 		return 0;
-	return sprintf(buf, "0x%08x\n",
-		       snd_hdac_read_parm(codec, nid, AC_PAR_STREAM));
+	return sysfs_emit(buf, "0x%08x\n",
+			  snd_hdac_read_parm(codec, nid, AC_PAR_STREAM));
 }
 
 static ssize_t amp_in_caps_show(struct hdac_device *codec, hda_nid_t nid,
@@ -221,8 +221,8 @@ static ssize_t amp_in_caps_show(struct hdac_device *codec, hda_nid_t nid,
 {
 	if (nid != codec->afg && !(get_wcaps(codec, nid) & AC_WCAP_IN_AMP))
 		return 0;
-	return sprintf(buf, "0x%08x\n",
-		       snd_hdac_read_parm(codec, nid, AC_PAR_AMP_IN_CAP));
+	return sysfs_emit(buf, "0x%08x\n",
+			  snd_hdac_read_parm(codec, nid, AC_PAR_AMP_IN_CAP));
 }
 
 static ssize_t amp_out_caps_show(struct hdac_device *codec, hda_nid_t nid,
@@ -230,8 +230,8 @@ static ssize_t amp_out_caps_show(struct hdac_device *codec, hda_nid_t nid,
 {
 	if (nid != codec->afg && !(get_wcaps(codec, nid) & AC_WCAP_OUT_AMP))
 		return 0;
-	return sprintf(buf, "0x%08x\n",
-		       snd_hdac_read_parm(codec, nid, AC_PAR_AMP_OUT_CAP));
+	return sysfs_emit(buf, "0x%08x\n",
+			  snd_hdac_read_parm(codec, nid, AC_PAR_AMP_OUT_CAP));
 }
 
 static ssize_t power_caps_show(struct hdac_device *codec, hda_nid_t nid,
@@ -239,15 +239,15 @@ static ssize_t power_caps_show(struct hdac_device *codec, hda_nid_t nid,
 {
 	if (nid != codec->afg && !(get_wcaps(codec, nid) & AC_WCAP_POWER))
 		return 0;
-	return sprintf(buf, "0x%08x\n",
-		       snd_hdac_read_parm(codec, nid, AC_PAR_POWER_STATE));
+	return sysfs_emit(buf, "0x%08x\n",
+			  snd_hdac_read_parm(codec, nid, AC_PAR_POWER_STATE));
 }
 
 static ssize_t gpio_caps_show(struct hdac_device *codec, hda_nid_t nid,
 			      struct widget_attribute *attr, char *buf)
 {
-	return sprintf(buf, "0x%08x\n",
-		       snd_hdac_read_parm(codec, nid, AC_PAR_GPIO_CAP));
+	return sysfs_emit(buf, "0x%08x\n",
+			  snd_hdac_read_parm(codec, nid, AC_PAR_GPIO_CAP));
 }
 
 static ssize_t connections_show(struct hdac_device *codec, hda_nid_t nid,
@@ -261,8 +261,8 @@ static ssize_t connections_show(struct hdac_device *codec, hda_nid_t nid,
 	if (nconns <= 0)
 		return nconns;
 	for (i = 0; i < nconns; i++)
-		ret += sprintf(buf + ret, "%s0x%02x", i ? " " : "", list[i]);
-	ret += sprintf(buf + ret, "\n");
+		ret += sysfs_emit_at(buf,  ret, "%s0x%02x", i ? " " : "", list[i]);
+	ret += sysfs_emit_at(buf, ret, "\n");
 	return ret;
 }
 
diff --git a/sound/pci/hda/hda_sysfs.c b/sound/pci/hda/hda_sysfs.c
index d5ffcba794e5..bf951c10ae61 100644
--- a/sound/pci/hda/hda_sysfs.c
+++ b/sound/pci/hda/hda_sysfs.c
@@ -33,7 +33,7 @@ static ssize_t power_on_acct_show(struct device *dev,
 {
 	struct hda_codec *codec = dev_get_drvdata(dev);
 	snd_hda_update_power_acct(codec);
-	return sprintf(buf, "%u\n", jiffies_to_msecs(codec->power_on_acct));
+	return sysfs_emit(buf, "%u\n", jiffies_to_msecs(codec->power_on_acct));
 }
 
 static ssize_t power_off_acct_show(struct device *dev,
@@ -42,7 +42,7 @@ static ssize_t power_off_acct_show(struct device *dev,
 {
 	struct hda_codec *codec = dev_get_drvdata(dev);
 	snd_hda_update_power_acct(codec);
-	return sprintf(buf, "%u\n", jiffies_to_msecs(codec->power_off_acct));
+	return sysfs_emit(buf, "%u\n", jiffies_to_msecs(codec->power_off_acct));
 }
 
 static DEVICE_ATTR_RO(power_on_acct);
@@ -55,7 +55,7 @@ static ssize_t type##_show(struct device *dev,			\
 			   char *buf)				\
 {								\
 	struct hda_codec *codec = dev_get_drvdata(dev);		\
-	return sprintf(buf, "0x%x\n", codec->field);		\
+	return sysfs_emit(buf, "0x%x\n", codec->field);		\
 }
 
 #define CODEC_INFO_STR_SHOW(type, field)			\
@@ -64,8 +64,8 @@ static ssize_t type##_show(struct device *dev,			\
 					char *buf)		\
 {								\
 	struct hda_codec *codec = dev_get_drvdata(dev);		\
-	return sprintf(buf, "%s\n",				\
-		       codec->field ? codec->field : "");	\
+	return sysfs_emit(buf, "%s\n",				\
+			  codec->field ? codec->field : "");	\
 }
 
 CODEC_INFO_SHOW(vendor_id, core.vendor_id);
@@ -85,8 +85,8 @@ static ssize_t pin_configs_show(struct hda_codec *codec,
 	int i, len = 0;
 	mutex_lock(&codec->user_mutex);
 	snd_array_for_each(list, i, pin) {
-		len += sprintf(buf + len, "0x%02x 0x%08x\n",
-			       pin->nid, pin->cfg);
+		len += sysfs_emit_at(buf, len, "0x%02x 0x%08x\n",
+				     pin->nid, pin->cfg);
 	}
 	mutex_unlock(&codec->user_mutex);
 	return len;
@@ -222,9 +222,8 @@ static ssize_t init_verbs_show(struct device *dev,
 	int i, len = 0;
 	mutex_lock(&codec->user_mutex);
 	snd_array_for_each(&codec->init_verbs, i, v) {
-		len += scnprintf(buf + len, PAGE_SIZE - len,
-				"0x%02x 0x%03x 0x%04x\n",
-				v->nid, v->verb, v->param);
+		len += sysfs_emit_at(buf, len, "0x%02x 0x%03x 0x%04x\n",
+				     v->nid, v->verb, v->param);
 	}
 	mutex_unlock(&codec->user_mutex);
 	return len;
@@ -272,8 +271,8 @@ static ssize_t hints_show(struct device *dev,
 	int i, len = 0;
 	mutex_lock(&codec->user_mutex);
 	snd_array_for_each(&codec->hints, i, hint) {
-		len += scnprintf(buf + len, PAGE_SIZE - len,
-				"%s = %s\n", hint->key, hint->val);
+		len += sysfs_emit_at(buf, len, "%s = %s\n",
+				     hint->key, hint->val);
 	}
 	mutex_unlock(&codec->user_mutex);
 	return len;
-- 
2.35.3

[PATCH 7/7] ALSA: line6: Replace sprintf() with sysfs_emit()

[Takashi Iwai]

For sysfs outputs, it's safer to use a new helper, sysfs_emit(),
instead of the raw sprintf() & co.  This patch replaces those usages
straightforwardly with a new helper, sysfs_emit().

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 sound/usb/line6/pod.c   | 8 ++++----
 sound/usb/line6/podhd.c | 4 ++--
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/sound/usb/line6/pod.c b/sound/usb/line6/pod.c
index 16e644330c4d..cd41aa7f0385 100644
--- a/sound/usb/line6/pod.c
+++ b/sound/usb/line6/pod.c
@@ -235,7 +235,7 @@ static ssize_t serial_number_show(struct device *dev,
 	struct snd_card *card = dev_to_snd_card(dev);
 	struct usb_line6_pod *pod = card->private_data;
 
-	return sprintf(buf, "%u\n", pod->serial_number);
+	return sysfs_emit(buf, "%u\n", pod->serial_number);
 }
 
 /*
@@ -247,8 +247,8 @@ static ssize_t firmware_version_show(struct device *dev,
 	struct snd_card *card = dev_to_snd_card(dev);
 	struct usb_line6_pod *pod = card->private_data;
 
-	return sprintf(buf, "%d.%02d\n", pod->firmware_version / 100,
-		       pod->firmware_version % 100);
+	return sysfs_emit(buf, "%d.%02d\n", pod->firmware_version / 100,
+			  pod->firmware_version % 100);
 }
 
 /*
@@ -260,7 +260,7 @@ static ssize_t device_id_show(struct device *dev,
 	struct snd_card *card = dev_to_snd_card(dev);
 	struct usb_line6_pod *pod = card->private_data;
 
-	return sprintf(buf, "%d\n", pod->device_id);
+	return sysfs_emit(buf, "%d\n", pod->device_id);
 }
 
 /*
diff --git a/sound/usb/line6/podhd.c b/sound/usb/line6/podhd.c
index b24bc82f89e3..ffd8c157a281 100644
--- a/sound/usb/line6/podhd.c
+++ b/sound/usb/line6/podhd.c
@@ -146,7 +146,7 @@ static ssize_t serial_number_show(struct device *dev,
 	struct snd_card *card = dev_to_snd_card(dev);
 	struct usb_line6_podhd *pod = card->private_data;
 
-	return sprintf(buf, "%u\n", pod->serial_number);
+	return sysfs_emit(buf, "%u\n", pod->serial_number);
 }
 
 static ssize_t firmware_version_show(struct device *dev,
@@ -155,7 +155,7 @@ static ssize_t firmware_version_show(struct device *dev,
 	struct snd_card *card = dev_to_snd_card(dev);
 	struct usb_line6_podhd *pod = card->private_data;
 
-	return sprintf(buf, "%06x\n", pod->firmware_version);
+	return sysfs_emit(buf, "%06x\n", pod->firmware_version);
 }
 
 static DEVICE_ATTR_RO(firmware_version);
-- 
2.35.3