[PATCH] char: xillybus: use stream_open for stream semantics

[mdshahid03]

From: Mohammad Shahid <mdshahid03@xxxxxxxxx>

The Xillybus uses nonseekable_open() in xillybus_open()
for non-seekable channels. However,its read and write
callbacks maintain their own buffer positions and do not
use the file position passed by VFS.

Use stream_open() to mark these channels as streams and
disable unnecessary file position handling,allowing read
and write operations to run concurrently.

This issue is reported by stream_open.cocci script as a
potential deadlock between read and write operations.

Signed-off-by: Mohammad Shahid <mdshahid03@xxxxxxxxx>
---
 drivers/char/xillybus/xillybus_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/char/xillybus/xillybus_core.c b/drivers/char/xillybus/xillybus_core.c
index 7189c6d97e7d..92c526e84572 100644
--- a/drivers/char/xillybus/xillybus_core.c
+++ b/drivers/char/xillybus/xillybus_core.c
@@ -1607,7 +1607,7 @@ static int xillybus_open(struct inode *inode, struct file *filp)
 		mutex_unlock(&channel->wr_mutex);
 
 	if (!rc && (!channel->seekable))
-		return nonseekable_open(inode, filp);
+		return stream_open(inode, filp);
 
 	return rc;
 }
-- 
2.43.0