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hwrng: iproc-rng200 - do not use static structure 

Instead of using static hwrng structure that is reused between
binds/unbinds of the device let's embed it into driver's private
structure that we allocate. This way we are guaranteed not to stumble
onto something left from previous bind attempt.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Dmitry Torokhov 2015-03-12 14:00:06 -07:00 committed by Herbert Xu
parent 9052b0dd45
commit ef0a1b2649
1 changed files with 21 additions and 23 deletions
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44
drivers/char/hw_random/iproc-rng200.c
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@ -48,9 +48,12 @@
#define RNG_FIFO_COUNT_RNG_FIFO_COUNT_MASK 0x000000FF
struct iproc_rng200_dev {
void __iomem *base;
struct hwrng rng;
void __iomem *base;
};
#define to_rng_priv(rng) container_of(rng, struct iproc_rng200_dev, rng)
static void iproc_rng200_restart(void __iomem *rng_base)
{
uint32_t val;
@ -89,11 +92,11 @@ static void iproc_rng200_restart(void __iomem *rng_base)
}
static int iproc_rng200_read(struct hwrng *rng, void *buf, size_t max,
bool wait)
bool wait)
{
uint32_t status;
struct iproc_rng200_dev *priv = to_rng_priv(rng);
uint32_t num_remaining = max;
struct iproc_rng200_dev *priv = (struct iproc_rng200_dev *)rng->priv;
uint32_t status;
#define MAX_RESETS_PER_READ 1
uint32_t num_resets = 0;
@ -151,10 +154,8 @@ static int iproc_rng200_read(struct hwrng *rng, void *buf, size_t max,
static int iproc_rng200_init(struct hwrng *rng)
{
struct iproc_rng200_dev *priv = to_rng_priv(rng);
uint32_t val;
struct iproc_rng200_dev *priv;
priv = (struct iproc_rng200_dev *)rng->priv;
/* Setup RNG. */
val = ioread32(priv->base + RNG_CTRL_OFFSET);
@ -167,10 +168,8 @@ static int iproc_rng200_init(struct hwrng *rng)
static void iproc_rng200_cleanup(struct hwrng *rng)
{
struct iproc_rng200_dev *priv = to_rng_priv(rng);
uint32_t val;
struct iproc_rng200_dev *priv;
priv = (struct iproc_rng200_dev *)rng->priv;
/* Disable RNG hardware */
val = ioread32(priv->base + RNG_CTRL_OFFSET);
@ -179,13 +178,6 @@ static void iproc_rng200_cleanup(struct hwrng *rng)
iowrite32(val, priv->base + RNG_CTRL_OFFSET);
}
static struct hwrng iproc_rng200_ops = {
.name = "iproc-rng200",
.read = iproc_rng200_read,
.init = iproc_rng200_init,
.cleanup = iproc_rng200_cleanup,
};
static int iproc_rng200_probe(struct platform_device *pdev)
{
struct iproc_rng200_dev *priv;
@ -193,13 +185,10 @@ static int iproc_rng200_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
int ret;
priv = devm_kzalloc(dev, sizeof(struct iproc_rng200_dev), GFP_KERNEL);
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
iproc_rng200_ops.priv = (unsigned long)priv;
platform_set_drvdata(pdev, priv);
/* Map peripheral */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
@ -213,13 +202,20 @@ static int iproc_rng200_probe(struct platform_device *pdev)
return PTR_ERR(priv->base);
}
priv->rng.name = "iproc-rng200",
priv->rng.read = iproc_rng200_read,
priv->rng.init = iproc_rng200_init,
priv->rng.cleanup = iproc_rng200_cleanup,
/* Register driver */
ret = hwrng_register(&iproc_rng200_ops);
ret = hwrng_register(&priv->rng);
if (ret) {
dev_err(dev, "hwrng registration failed\n");
return ret;
}
platform_set_drvdata(pdev, priv);
dev_info(dev, "hwrng registered\n");
return 0;
@ -227,8 +223,10 @@ static int iproc_rng200_probe(struct platform_device *pdev)
static int iproc_rng200_remove(struct platform_device *pdev)
{
struct iproc_rng200_dev *priv = platform_get_drvdata(pdev);
/* Unregister driver */
hwrng_unregister(&iproc_rng200_ops);
hwrng_unregister(&priv->rng);
return 0;
}