From 30780d086a83332adcd9362281201cee7c3d9d19 Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@arndb.de>
Date: Tue, 7 Jan 2020 21:43:59 +0100
Subject: [PATCH] atm: eni: fix uninitialized variable warning
Git-commit: 30780d086a83332adcd9362281201cee7c3d9d19
Patch-mainline: v5.5-rc6
References: git-fixes
With -O3, gcc has found an actual unintialized variable stored
into an mmio register in two instances:
Drivers/atm/eni.c: In function 'discard':
drivers/atm/eni.c:465:13: error: 'dma[1]' is used uninitialized in this function [-Werror=uninitialized]
writel(dma[i*2+1],eni_dev->rx_dma+dma_wr*8+4);
^
drivers/atm/eni.c:465:13: error: 'dma[3]' is used uninitialized in this function [-Werror=uninitialized]
Change the code to always write zeroes instead.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/atm/eni.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/atm/eni.c b/drivers/atm/eni.c
index b23d1e4bad33..9d0d65efcd94 100644
--- a/drivers/atm/eni.c
+++ b/drivers/atm/eni.c
@@ -374,7 +374,7 @@ static int do_rx_dma(struct atm_vcc *vcc,struct sk_buff *skb,
here = (eni_vcc->descr+skip) & (eni_vcc->words-1);
dma[j++] = (here << MID_DMA_COUNT_SHIFT) | (vcc->vci
<< MID_DMA_VCI_SHIFT) | MID_DT_JK;
- j++;
+ dma[j++] = 0;
}
here = (eni_vcc->descr+size+skip) & (eni_vcc->words-1);
if (!eff) size += skip;
@@ -447,7 +447,7 @@ static int do_rx_dma(struct atm_vcc *vcc,struct sk_buff *skb,
if (size != eff) {
dma[j++] = (here << MID_DMA_COUNT_SHIFT) |
(vcc->vci << MID_DMA_VCI_SHIFT) | MID_DT_JK;
- j++;
+ dma[j++] = 0;
}
if (!j || j > 2*RX_DMA_BUF) {
printk(KERN_CRIT DEV_LABEL "!j or j too big!!!\n");
--
2.16.4