5.4-stable review patch. If anyone has any objections, please let me know.
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From: Linus Walleij linus.walleij@linaro.org
[ Upstream commit 812552808f7ff71133fc59768cdc253c5b8ca1bf ]
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@linaro.org Reviewed-by: Simon Horman horms@kernel.org Link: https://lore.kernel.org/r/20240509-gemini-ethernet-locking-v1-1-afd00a528b95... Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.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 4bcdb48b0e9cc..91952d086f226 100644 --- a/drivers/net/ethernet/cortina/gemini.c +++ b/drivers/net/ethernet/cortina/gemini.c @@ -1115,10 +1115,13 @@ 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) @@ -1127,6 +1130,8 @@ 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) @@ -1432,15 +1437,19 @@ 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;
@@ -1743,10 +1752,9 @@ 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);