linux-kernel - [PATCH] PCI/ASPM: Use 64-bit arithmetic instead of 32-bit

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Date:   Tue, 13 Feb 2018 10:59:49 -0600
From:   "Gustavo A. R. Silva" <garsilva@...eddedor.com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <garsilva@...eddedor.com>
Subject: [PATCH] PCI/ASPM: Use 64-bit arithmetic instead of 32-bit

Add suffix ULL to constant 1000 in order to give the compiler complete
information about the proper arithmetic to use. Notice that this
constant is used in a context that expects an expression of type
u64 (64 bits, unsigned).

The expression threshold_us * 1000 is currently being evaluated
using 32-bit arithmetic.

Addresses-Coverity-ID: 1462501
Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
---
 drivers/pci/pcie/aspm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index 57feef2..684d326 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -322,7 +322,7 @@ static u32 calc_l1ss_pwron(struct pci_dev *pdev, u32 scale, u32 val)
 
 static void encode_l12_threshold(u32 threshold_us, u32 *scale, u32 *value)
 {
-	u64 threshold_ns = threshold_us * 1000;
+	u64 threshold_ns = threshold_us * 1000ULL;
 
 	/* See PCIe r3.1, sec 7.33.3 and sec 6.18 */
 	if (threshold_ns < 32) {
-- 
2.7.4