From 947b2a8083a03e6fff448ce8928956015614855e Mon Sep 17 00:00:00 2001 From: Eli Cohen Date: Mon, 13 Aug 2007 17:57:03 +0300 Subject: [PATCH] mlx4_core: Wait 1 second after reset before accessing device Put a 1000 msec delay after resetting the device before attempting to do config cycles on it. Not waiting causes system hangs on some chipsets, e.g. Intel E7520, when the driver is loaded. Signed-off-by: Eli Cohen Signed-off-by: Roland Dreier --- drivers/net/mlx4/reset.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/mlx4/reset.c b/drivers/net/mlx4/reset.c index e4dfd4b11a4..e199715fabd 100644 --- a/drivers/net/mlx4/reset.c +++ b/drivers/net/mlx4/reset.c @@ -119,6 +119,9 @@ int mlx4_reset(struct mlx4_dev *dev) writel(MLX4_RESET_VALUE, reset + MLX4_RESET_OFFSET); iounmap(reset); + /* Docs say to wait one second before accessing device */ + msleep(1000); + end = jiffies + MLX4_RESET_TIMEOUT_JIFFIES; do { if (!pci_read_config_word(dev->pdev, PCI_VENDOR_ID, &vendor) && -- 2.20.1