linux-kernel - [PATCH] drivers/char/agp: Fix divide by zero warning in isoch.c

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Message-Id: <20220521073848.4052-1-gautam.linuxkernel@gmail.com>
Date:   Sat, 21 May 2022 00:38:48 -0700
From:   Gautam Menghani <gautam.linuxkernel@...il.com>
To:     airlied@...ux.ie
Cc:     Gautam Menghani <gautam.linuxkernel@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] drivers/char/agp: Fix divide by zero warning in isoch.c

Add a check to ensure ndevs is not zero. This was found by clang scan
warning: Division by zero [core.DivideZero]
        mrq = trq / ndevs;

Signed-off-by: Gautam Menghani <gautam.linuxkernel@...il.com>
---
 drivers/char/agp/isoch.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/char/agp/isoch.c b/drivers/char/agp/isoch.c
index 7ecf20a6d19c..da0d2681225b 100644
--- a/drivers/char/agp/isoch.c
+++ b/drivers/char/agp/isoch.c
@@ -289,6 +289,9 @@ static void agp_3_5_nonisochronous_node_enable(struct agp_bridge_data *bridge,
 	u32 trq, mrq, rem;
 	unsigned int cdev = 0;
 
+	if (ndevs == 0)
+		return;
+
 	pci_read_config_dword(bridge->dev, bridge->capndx+AGPSTAT, &tstatus);
 
 	trq = (tstatus >> 24) & 0xff;
-- 
2.25.1