[PATCH v3 2/3] iio: ssp_sensors: simplify cleanup using __free

[Sanjay Chitroda <sanjayembeddedse@gmail.com>]

From: Sanjay Chitroda <sanjayembeddedse@gmail.com>

Replace manual cleanup logic with __free attribute from cleanup.h. This
removes explicit kfree() calls and simplifies the error handling paths.

No functional change intended for kmalloc().

Signed-off-by: Sanjay Chitroda <sanjayembeddedse@gmail.com>
---
Changes in v3:
- prepare series to have all respective cleanup API support for the ssp_sensors following input from Andy Shevchenko
- Link to v2 https://lore.kernel.org/all/20260311174151.3441429-1-sanjayembedded@gmail.com/
Changes in v2:
- split series to individual patch
- address review comment from Andy Shevchenko
- Link to v1 https://lore.kernel.org/all/20260310200513.2162018-3-sanjayembedded@gmail.com/
---
 drivers/iio/common/ssp_sensors/ssp_spi.c | 14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)

diff --git a/drivers/iio/common/ssp_sensors/ssp_spi.c b/drivers/iio/common/ssp_sensors/ssp_spi.c
index 87a38002b218..9df94bd02e3a 100644
--- a/drivers/iio/common/ssp_sensors/ssp_spi.c
+++ b/drivers/iio/common/ssp_sensors/ssp_spi.c
@@ -326,7 +326,6 @@ static int ssp_parse_dataframe(struct ssp_data *data, char *dataframe, int len)
 /* threaded irq */
 int ssp_irq_msg(struct ssp_data *data)
 {
-	char *buffer;
 	u8 msg_type;
 	int ret;
 	u16 length, msg_options;
@@ -370,7 +369,7 @@ int ssp_irq_msg(struct ssp_data *data)
 			 * but the slave should not send such ones - it is to
 			 * check but let's handle this
 			 */
-			buffer = kmalloc(length, GFP_KERNEL | GFP_DMA);
+			char *buffer __free(kfree) = kmalloc(length, GFP_KERNEL | GFP_DMA);
 			if (!buffer)
 				return -ENOMEM;
 
@@ -379,8 +378,6 @@ int ssp_irq_msg(struct ssp_data *data)
 			if (ret >= 0)
 				ret = -EPROTO;
 
-			kfree(buffer);
-
 			dev_err(SSP_DEV, "No match error %x\n",
 				msg_options);
 
@@ -411,22 +408,17 @@ int ssp_irq_msg(struct ssp_data *data)
 				complete(msg->done);
 		break;
 	case SSP_HUB2AP_WRITE:
-		buffer = kzalloc(length, GFP_KERNEL | GFP_DMA);
+		char *buffer __free(kfree) = kzalloc(length, GFP_KERNEL | GFP_DMA);
 		if (!buffer)
 			return -ENOMEM;
 
 		ret = spi_read(data->spi, buffer, length);
 		if (ret < 0) {
 			dev_err(SSP_DEV, "spi read fail\n");
-			kfree(buffer);
 			break;
 		}
 
-		ret = ssp_parse_dataframe(data, buffer, length);
-
-		kfree(buffer);
-		break;
-
+		return ssp_parse_dataframe(data, buffer, length);
 	default:
 		dev_err(SSP_DEV, "unknown msg type\n");
 		return -EPROTO;
-- 
2.34.1