linux-kernel - [PATCH] ocxl: fix signed comparison with less than zero

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Message-Id: <20180130151144.32544-1-colin.king@canonical.com>
Date:   Tue, 30 Jan 2018 15:11:44 +0000
From:   Colin King <colin.king@...onical.com>
To:     Frederic Barrat <fbarrat@...ux.vnet.ibm.com>,
        Andrew Donnellan <andrew.donnellan@....ibm.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linuxppc-dev@...ts.ozlabs.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] ocxl: fix signed comparison with less than zero

From: Colin Ian King <colin.king@...onical.com>

Currently the comparison of used < 0 is always false because
uses is a size_t. Fix this by making used a ssize_t type.

Detected by Coccinelle:
drivers/misc/ocxl/file.c:320:6-10: WARNING: Unsigned expression
compared with zero: used < 0

Fixes: 5ef3166e8a32 ("ocxl: Driver code for 'generic' opencapi devices")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/misc/ocxl/file.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/misc/ocxl/file.c b/drivers/misc/ocxl/file.c
index c90c1a578d2f..1287e4430e6b 100644
--- a/drivers/misc/ocxl/file.c
+++ b/drivers/misc/ocxl/file.c
@@ -277,7 +277,7 @@ static ssize_t afu_read(struct file *file, char __user *buf, size_t count,
 	struct ocxl_context *ctx = file->private_data;
 	struct ocxl_kernel_event_header header;
 	ssize_t rc;
-	size_t used = 0;
+	ssize_t used = 0;
 	DEFINE_WAIT(event_wait);
 
 	memset(&header, 0, sizeof(header));
-- 
2.15.1