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[ARM] 4403/1: Make the PXA-I2C driver work with lockdep validator 

Using lockdep validator causes warnings like

  INFO: trying to register non-static key.
  the code is fine but needs lockdep annotation.
  turning off the locking correctness validator.
  [<c00241a0>] (dump_stack+0x0/0x14) from [<c00520f8>] (__lock_acquire+0x150/0xc40)
  [<c0051fa8>] (__lock_acquire+0x0/0xc40) from [<c00530a0>] (lock_acquire+0x5c/0x70)
  [<c0053044>] (lock_acquire+0x0/0x70) from [<c01d9e44>] (_spin_lock_irq+0x48/0x58)
   r7:c07e5144 r6:00000000 r5:c015fb94 r4:c07e50b8
  [<c01d9dfc>] (_spin_lock_irq+0x0/0x58) from [<c015fb94>] (i2c_pxa_xfer+0x110/0x2e0)
   r5:c07e50b8 r4:0000001f

This is caused by memcpy'ing a statical initialized spin-lock. This patch
removes a static pxa_i2c structure which was used only as a source for this
memcpy() operation. Instead of, members and the spinlock will be
initialized manually.

Signed-off-by: Enrico Scholz <enrico.scholz@sigma-chemnitz.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
wifi-calibration
Enrico Scholz 2007-05-21 12:29:40 +01:00 committed by Russell King
parent ece97941c3
commit 6776f3d26a
1 changed files with 9 additions and 14 deletions
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23
drivers/i2c/busses/i2c-pxa.c
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@ -837,20 +837,10 @@ static const struct i2c_algorithm i2c_pxa_algorithm = {
.functionality = i2c_pxa_functionality,
};
static struct pxa_i2c i2c_pxa = {
.lock = __SPIN_LOCK_UNLOCKED(i2c_pxa.lock),
.adap = {
.owner = THIS_MODULE,
.algo = &i2c_pxa_algorithm,
.name = "pxa2xx-i2c.0",
.retries = 5,
},
};
#define res_len(r) ((r)->end - (r)->start + 1)
static int i2c_pxa_probe(struct platform_device *dev)
{
struct pxa_i2c *i2c = &i2c_pxa;
struct pxa_i2c *i2c;
struct resource *res;
struct i2c_pxa_platform_data *plat = dev->dev.platform_data;
int ret;
@ -864,15 +854,20 @@ static int i2c_pxa_probe(struct platform_device *dev)
if (!request_mem_region(res->start, res_len(res), res->name))
return -ENOMEM;
i2c = kmalloc(sizeof(struct pxa_i2c), GFP_KERNEL);
i2c = kzalloc(sizeof(struct pxa_i2c), GFP_KERNEL);
if (!i2c) {
ret = -ENOMEM;
goto emalloc;
}
memcpy(i2c, &i2c_pxa, sizeof(struct pxa_i2c));
i2c->adap.owner = THIS_MODULE;
i2c->adap.algo = &i2c_pxa_algorithm;
i2c->adap.retries = 5;
spin_lock_init(&i2c->lock);
init_waitqueue_head(&i2c->wait);
i2c->adap.name[strlen(i2c->adap.name) - 1] = '0' + dev->id % 10;
sprintf(i2c->adap.name, "pxa_i2c-i2c.%u", dev->id);
i2c->reg_base = ioremap(res->start, res_len(res));
if (!i2c->reg_base) {