[PATCH 4.12 21/43] fpga: altera-hps2fpga: fix multiple init of l3_remap_lock

From: Greg Kroah-Hartman
Date: Fri Sep 08 2017 - 09:23:47 EST

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);