[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-Id: <20240509-gemini-ethernet-locking-v1-1-afd00a528b95@linaro.org>
Date: Thu, 09 May 2024 09:44:54 +0200
From: Linus Walleij <linus.walleij@...aro.org>
To: Hans Ulli Kroll <ulli.kroll@...glemail.com>,
"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Michał Mirosław <mirq-linux@...e.qmqm.pl>
Cc: netdev@...r.kernel.org, Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH net] net: ethernet: cortina: Locking fixes
This fixes a probably long standing problem in the Cortina
Gemini ethernet driver: there are some paths in the code
where the IRQ registers are written without taking the proper
locks.
Fixes: 4d5ae32f5e1e ("net: ethernet: Add a driver for Gemini gigabit ethernet")
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
drivers/net/ethernet/cortina/gemini.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/cortina/gemini.c b/drivers/net/ethernet/cortina/gemini.c
index 705c3eb19cd3..d1fbadbf86d4 100644
--- a/drivers/net/ethernet/cortina/gemini.c
+++ b/drivers/net/ethernet/cortina/gemini.c
@@ -1107,10 +1107,13 @@ static void gmac_tx_irq_enable(struct net_device *netdev,
{
struct gemini_ethernet_port *port = netdev_priv(netdev);
struct gemini_ethernet *geth = port->geth;
+ unsigned long flags;
u32 val, mask;
netdev_dbg(netdev, "%s device %d\n", __func__, netdev->dev_id);
+ spin_lock_irqsave(&geth->irq_lock, flags);
+
mask = GMAC0_IRQ0_TXQ0_INTS << (6 * netdev->dev_id + txq);
if (en)
@@ -1119,6 +1122,8 @@ static void gmac_tx_irq_enable(struct net_device *netdev,
val = readl(geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG);
val = en ? val | mask : val & ~mask;
writel(val, geth->base + GLOBAL_INTERRUPT_ENABLE_0_REG);
+
+ spin_unlock_irqrestore(&geth->irq_lock, flags);
}
static void gmac_tx_irq(struct net_device *netdev, unsigned int txq_num)
@@ -1415,15 +1420,19 @@ static unsigned int gmac_rx(struct net_device *netdev, unsigned int budget)
union gmac_rxdesc_3 word3;
struct page *page = NULL;
unsigned int page_offs;
+ unsigned long flags;
unsigned short r, w;
union dma_rwptr rw;
dma_addr_t mapping;
int frag_nr = 0;
+ spin_lock_irqsave(&geth->irq_lock, flags);
rw.bits32 = readl(ptr_reg);
/* Reset interrupt as all packages until here are taken into account */
writel(DEFAULT_Q0_INT_BIT << netdev->dev_id,
geth->base + GLOBAL_INTERRUPT_STATUS_1_REG);
+ spin_unlock_irqrestore(&geth->irq_lock, flags);
+
r = rw.bits.rptr;
w = rw.bits.wptr;
@@ -1726,10 +1735,9 @@ static irqreturn_t gmac_irq(int irq, void *data)
gmac_update_hw_stats(netdev);
if (val & (GMAC0_RX_OVERRUN_INT_BIT << (netdev->dev_id * 8))) {
+ spin_lock(&geth->irq_lock);
writel(GMAC0_RXDERR_INT_BIT << (netdev->dev_id * 8),
geth->base + GLOBAL_INTERRUPT_STATUS_4_REG);
-
- spin_lock(&geth->irq_lock);
u64_stats_update_begin(&port->ir_stats_syncp);
++port->stats.rx_fifo_errors;
u64_stats_update_end(&port->ir_stats_syncp);
---
base-commit: 4cece764965020c22cff7665b18a012006359095
change-id: 20240509-gemini-ethernet-locking-7c1cb004ed49
Best regards,
--
Linus Walleij <linus.walleij@...aro.org>
Powered by blists - more mailing lists