linux-kernel - [PATCH net v2 1/5] fsl/fman: use 32-bit unsigned integer

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Message-Id: <1596192562-7629-2-git-send-email-florinel.iordache@nxp.com>
Date:   Fri, 31 Jul 2020 13:49:18 +0300
From:   Florinel Iordache <florinel.iordache@....com>
To:     madalin.bucur@....com, davem@...emloft.net, kuba@...nel.org,
        netdev@...r.kernel.org, Markus.Elfring@....de
Cc:     linux-kernel@...r.kernel.org,
        Florinel Iordache <florinel.iordache@....com>
Subject: [PATCH net v2 1/5] fsl/fman: use 32-bit unsigned integer

Potentially overflowing expression (ts_freq << 16 and intgr << 16)
declared as type u32 (32-bit unsigned) is evaluated using 32-bit
arithmetic and then used in a context that expects an expression of
type u64 (64-bit unsigned) which ultimately is used as 16-bit
unsigned by typecasting to u16. Fixed by using an unsigned 32-bit
integer since the value is truncated anyway in the end.

Fixes: 414fd46e7762 ("fsl/fman: Add FMan support")

Signed-off-by: Florinel Iordache <florinel.iordache@....com>
---
 drivers/net/ethernet/freescale/fman/fman.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/freescale/fman/fman.c b/drivers/net/ethernet/freescale/fman/fman.c
index f151d6e..ef67e85 100644
--- a/drivers/net/ethernet/freescale/fman/fman.c
+++ b/drivers/net/ethernet/freescale/fman/fman.c
@@ -1398,8 +1398,7 @@ static void enable_time_stamp(struct fman *fman)
 {
 	struct fman_fpm_regs __iomem *fpm_rg = fman->fpm_regs;
 	u16 fm_clk_freq = fman->state->fm_clk_freq;
-	u32 tmp, intgr, ts_freq;
-	u64 frac;
+	u32 tmp, intgr, ts_freq, frac;
 
 	ts_freq = (u32)(1 << fman->state->count1_micro_bit);
 	/* configure timestamp so that bit 8 will count 1 microsecond
-- 
1.9.1