linux-kernel - [PATCH v4] staging: axis-fifo: initialize read_timeout and write

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Date:   Sun, 12 Mar 2023 22:33:19 +0500
From:   Khadija Kamran <kamrankhadijadj@...il.com>
To:     outreachy@...ts.linux.dev
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: [PATCH v4] staging: axis-fifo: initialize read_timeout and
 write_timeout once in probe function

Module parameter, read_timeout, can only be set at loading time. As it
can only be modified once, initialize read_timeout once in the probe
function.
As a result, only use read_timeout as the last argument in
wait_event_interruptible_timeout() call.

Same goes for write_timeout.

Signed-off-by: Khadija Kamran <kamrankhadijadj@...il.com>
---
 drivers/staging/axis-fifo/axis-fifo.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/drivers/staging/axis-fifo/axis-fifo.c b/drivers/staging/axis-fifo/axis-fifo.c
index b119cec25a60..7ec8722cef7d 100644
--- a/drivers/staging/axis-fifo/axis-fifo.c
+++ b/drivers/staging/axis-fifo/axis-fifo.c
@@ -384,9 +384,7 @@ static ssize_t axis_fifo_read(struct file *f, char __user *buf,
 		mutex_lock(&fifo->read_lock);
 		ret = wait_event_interruptible_timeout(fifo->read_queue,
 			ioread32(fifo->base_addr + XLLF_RDFO_OFFSET),
-			(read_timeout >= 0) ?
-			msecs_to_jiffies(read_timeout) :
-			MAX_SCHEDULE_TIMEOUT);
+			read_timeout);
 
 		if (ret <= 0) {
 			if (ret == 0) {
@@ -528,9 +526,7 @@ static ssize_t axis_fifo_write(struct file *f, const char __user *buf,
 		ret = wait_event_interruptible_timeout(fifo->write_queue,
 			ioread32(fifo->base_addr + XLLF_TDFV_OFFSET)
 				 >= words_to_write,
-			(write_timeout >= 0) ?
-			msecs_to_jiffies(write_timeout) :
-			MAX_SCHEDULE_TIMEOUT);
+			write_timeout);
 
 		if (ret <= 0) {
 			if (ret == 0) {
@@ -814,6 +810,16 @@ static int axis_fifo_probe(struct platform_device *pdev)
 	struct axis_fifo *fifo = NULL;
 	char *device_name;
 	int rc = 0; /* error return value */
+	
+	if (read_timeout >= 0)
+		read_timeout = msecs_to_jiffies(read_timeout);
+	else
+		read_timeout = MAX_SCHEDULE_TIMEOUT;
+	
+	if (write_timeout >= 0)
+		write_timeout = msecs_to_jiffies(write_timeout);
+	else
+		write_timeout = MAX_SCHEDULE_TIMEOUT;
 
 	/* ----------------------------
 	 *     init wrapper device
-- 
2.34.1