linux-kernel - [PATCH] NTB: ntb_tool: reading the link file should not end in a NULL byte

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Message-Id: <20180607230937.7140-1-logang@deltatee.com>
Date:   Thu,  7 Jun 2018 17:09:37 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     linux-ntb@...glegroups.com, linux-kernel@...r.kernel.org
Cc:     Serge Semin <fancer.lancer@...il.com>,
        Allen Hubbe <allenbh@...il.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Jon Mason <jdmason@...zu.us>,
        Logan Gunthorpe <logang@...tatee.com>
Subject: [PATCH] NTB: ntb_tool: reading the link file should not end in a NULL byte

When running ntb_test this warning is issued:

./ntb_test.sh: line 200: warning: command substitution: ignored null
byte in input

This is caused by the kernel returning one more byte than is necessary
when reading the link file.

Reduce the number of bytes read back to 2 as it was before the
commit that regressed this.

Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
Fixes: 7f46c8b3a552 ("NTB: ntb_tool: Add full multi-port NTB API
support")
---
 drivers/ntb/test/ntb_tool.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/ntb/test/ntb_tool.c b/drivers/ntb/test/ntb_tool.c
index d592c0ffbd19..ec5cf095cdb9 100644
--- a/drivers/ntb/test/ntb_tool.c
+++ b/drivers/ntb/test/ntb_tool.c
@@ -504,7 +504,7 @@ static ssize_t tool_peer_link_read(struct file *filep, char __user *ubuf,
 	buf[1] = '\n';
 	buf[2] = '\0';
 
-	return simple_read_from_buffer(ubuf, size, offp, buf, 3);
+	return simple_read_from_buffer(ubuf, size, offp, buf, 2);
 }
 
 static TOOL_FOPS_RDWR(tool_peer_link_fops,
@@ -1690,4 +1690,3 @@ static void __exit tool_exit(void)
 	debugfs_remove_recursive(tool_dbgfs_topdir);
 }
 module_exit(tool_exit);
-
-- 
2.11.0