4.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ian Abbott <abbotti@xxxxxxxxx> commit 4ae2bd4b3ada3dfd80ca8110b4f567752966ca1e upstream. The global spinlock `l3_remap_lock` is reinitialized every time the "probe" function `alt_fpga_bridge_probe()` is called. It should only be initialized once. Use `DEFINE_SPINLOCK()` to initialize it statically. Fixes: e5f8efa5c8bf ("ARM: socfpga: fpga bridge driver support") Signed-off-by: Ian Abbott <abbotti@xxxxxxxxx> Reviewed-By: Moritz Fischer <mdf@xxxxxxxxxx> Signed-off-by: Alan Tull <atull@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/fpga/altera-hps2fpga.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) --- a/drivers/fpga/altera-hps2fpga.c +++ b/drivers/fpga/altera-hps2fpga.c @@ -66,7 +66,7 @@ static int alt_hps2fpga_enable_show(stru /* The L3 REMAP register is write only, so keep a cached value. */ static unsigned int l3_remap_shadow; -static spinlock_t l3_remap_lock; +static DEFINE_SPINLOCK(l3_remap_lock); static int _alt_hps2fpga_enable_set(struct altera_hps2fpga_data *priv, bool enable) @@ -171,8 +171,6 @@ static int alt_fpga_bridge_probe(struct return -EBUSY; } - spin_lock_init(&l3_remap_lock); - if (!of_property_read_u32(dev->of_node, "bridge-enable", &enable)) { if (enable > 1) { dev_warn(dev, "invalid bridge-enable %u > 1\n", enable);