linux-kernel - [Patch v1 1/1] staging: gpib: agilent

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Message-ID: <20250408225628.187316-2-matchstick@neverthere.org>
Date: Tue,  8 Apr 2025 22:56:28 +0000
From: Michael Rubin <matchstick@...erthere.org>
To: gregkh@...uxfoundation.org,
	dpenkler@...il.com
Cc: linux-staging@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Michael Rubin <matchstick@...erthere.org>
Subject: [Patch v1 1/1] staging: gpib: agilent_82357a uses completion

agilent_82357a_send_bulk_msg is a oneshot event where a semphore is meant for
synchronizing over counting events.

Recommendation is to use a completion instead.

Reported by checkpatch.

WARNING: consider using a completion

Signed-off-by: Michael Rubin <matchstick@...erthere.org>
---
 drivers/staging/gpib/agilent_82357a/agilent_82357a.c | 12 ++++++------
 drivers/staging/gpib/agilent_82357a/agilent_82357a.h |  4 ++--
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/staging/gpib/agilent_82357a/agilent_82357a.c b/drivers/staging/gpib/agilent_82357a/agilent_82357a.c
index baa8f149024c..97e7caefe35b 100644
--- a/drivers/staging/gpib/agilent_82357a/agilent_82357a.c
+++ b/drivers/staging/gpib/agilent_82357a/agilent_82357a.c
@@ -34,7 +34,7 @@ static void agilent_82357a_bulk_complete(struct urb *urb)
 {
 	struct agilent_82357a_urb_ctx *context = urb->context;
 
-	up(&context->complete);
+	complete(&context->complete);
 }
 
 static void agilent_82357a_timeout_handler(struct timer_list *t)
@@ -43,7 +43,7 @@ static void agilent_82357a_timeout_handler(struct timer_list *t)
 	struct agilent_82357a_urb_ctx *context = &a_priv->context;
 
 	context->timed_out = 1;
-	up(&context->complete);
+	complete(&context->complete);
 }
 
 static int agilent_82357a_send_bulk_msg(struct agilent_82357a_priv *a_priv, void *data,
@@ -74,7 +74,7 @@ static int agilent_82357a_send_bulk_msg(struct agilent_82357a_priv *a_priv, void
 	}
 	usb_dev = interface_to_usbdev(a_priv->bus_interface);
 	out_pipe = usb_sndbulkpipe(usb_dev, a_priv->bulk_out_endpoint);
-	sema_init(&context->complete, 0);
+	init_completion(&context->complete);
 	context->timed_out = 0;
 	usb_fill_bulk_urb(a_priv->bulk_urb, usb_dev, out_pipe, data, data_length,
 			  &agilent_82357a_bulk_complete, context);
@@ -89,7 +89,7 @@ static int agilent_82357a_send_bulk_msg(struct agilent_82357a_priv *a_priv, void
 		goto cleanup;
 	}
 	mutex_unlock(&a_priv->bulk_alloc_lock);
-	if (down_interruptible(&context->complete)) {
+	if (wait_for_completion_interruptible(&context->complete)) {
 		retval = -ERESTARTSYS;
 		goto cleanup;
 	}
@@ -142,7 +142,7 @@ static int agilent_82357a_receive_bulk_msg(struct agilent_82357a_priv *a_priv, v
 	}
 	usb_dev = interface_to_usbdev(a_priv->bus_interface);
 	in_pipe = usb_rcvbulkpipe(usb_dev, AGILENT_82357_BULK_IN_ENDPOINT);
-	sema_init(&context->complete, 0);
+	init_completion(&context->complete);
 	context->timed_out = 0;
 	usb_fill_bulk_urb(a_priv->bulk_urb, usb_dev, in_pipe, data, data_length,
 			  &agilent_82357a_bulk_complete, context);
@@ -157,7 +157,7 @@ static int agilent_82357a_receive_bulk_msg(struct agilent_82357a_priv *a_priv, v
 		goto cleanup;
 	}
 	mutex_unlock(&a_priv->bulk_alloc_lock);
-	if (down_interruptible(&context->complete)) {
+	if (wait_for_completion_interruptible(&context->complete)) {
 		retval = -ERESTARTSYS;
 		goto cleanup;
 	}
diff --git a/drivers/staging/gpib/agilent_82357a/agilent_82357a.h b/drivers/staging/gpib/agilent_82357a/agilent_82357a.h
index cdbc3ec5d8bd..23aa4799eb86 100644
--- a/drivers/staging/gpib/agilent_82357a/agilent_82357a.h
+++ b/drivers/staging/gpib/agilent_82357a/agilent_82357a.h
@@ -6,7 +6,7 @@
 
 #include <linux/kernel.h>
 #include <linux/mutex.h>
-#include <linux/semaphore.h>
+#include <linux/completion.h>
 #include <linux/usb.h>
 #include <linux/timer.h>
 #include <linux/compiler_attributes.h>
@@ -115,7 +115,7 @@ enum xfer_abort_type {
 #define INTERRUPT_BUF_LEN 8
 
 struct agilent_82357a_urb_ctx {
-	struct semaphore complete;
+	struct completion complete;
 	unsigned timed_out : 1;
 };
 
-- 
2.43.0