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fpga: altera-hps2fpga: fix multiple init of l3_remap_lock

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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: e5f8efa5c8 ("ARM: socfpga: fpga bridge driver support")
Cc: <stable@vger.kernel.org> # 4.10+
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-By: Moritz Fischer <mdf@kernel.org>
Signed-off-by: Alan Tull <atull@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott 2017-08-01 21:20:54 -05:00 committed by Greg Kroah-Hartman
parent 26ffca5ec4
commit 4ae2bd4b3a
1 changed files with 1 additions and 3 deletions
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4
drivers/fpga/altera-hps2fpga.c
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@ -66,7 +66,7 @@ static int alt_hps2fpga_enable_show(struct fpga_bridge *bridge)
/* 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)
@ -177,8 +177,6 @@ static int alt_fpga_bridge_probe(struct platform_device *pdev)
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);