diff options
Diffstat (limited to 'drivers/platform/goldfish/goldfish_pipe.c')
| -rw-r--r-- | drivers/platform/goldfish/goldfish_pipe.c | 66 |
1 files changed, 37 insertions, 29 deletions
diff --git a/drivers/platform/goldfish/goldfish_pipe.c b/drivers/platform/goldfish/goldfish_pipe.c index 8ca709b45e1f..4013832f38fb 100644 --- a/drivers/platform/goldfish/goldfish_pipe.c +++ b/drivers/platform/goldfish/goldfish_pipe.c @@ -169,6 +169,9 @@ struct goldfish_pipe { * waiting to be awoken. */ struct goldfish_pipe_dev { + /* A magic number to check if this is an instance of this struct */ + void *magic; + /* * Global device spinlock. Protects the following members: * - pipes, pipes_capacity @@ -215,8 +218,6 @@ struct goldfish_pipe_dev { struct miscdevice miscdev; }; -static struct goldfish_pipe_dev goldfish_pipe_dev; - static int goldfish_pipe_cmd_locked(struct goldfish_pipe *pipe, enum PipeCmdCode cmd) { @@ -611,6 +612,9 @@ static void goldfish_interrupt_task(unsigned long dev_addr) } } +static void goldfish_pipe_device_deinit(struct platform_device *pdev, + struct goldfish_pipe_dev *dev); + /* * The general idea of the interrupt handling: * @@ -631,7 +635,7 @@ static irqreturn_t goldfish_pipe_interrupt(int irq, void *dev_id) unsigned long flags; struct goldfish_pipe_dev *dev = dev_id; - if (dev != &goldfish_pipe_dev) + if (dev->magic != &goldfish_pipe_device_deinit) return IRQ_NONE; /* Request the signalled pipes from the device */ @@ -683,6 +687,14 @@ static int get_free_pipe_id_locked(struct goldfish_pipe_dev *dev) return id; } +/* A helper function to get the instance of goldfish_pipe_dev from file */ +static struct goldfish_pipe_dev *to_goldfish_pipe_dev(struct file *file) +{ + struct miscdevice *miscdev = file->private_data; + + return container_of(miscdev, struct goldfish_pipe_dev, miscdev); +} + /** * goldfish_pipe_open - open a channel to the AVD * @inode: inode of device @@ -696,7 +708,7 @@ static int get_free_pipe_id_locked(struct goldfish_pipe_dev *dev) */ static int goldfish_pipe_open(struct inode *inode, struct file *file) { - struct goldfish_pipe_dev *dev = &goldfish_pipe_dev; + struct goldfish_pipe_dev *dev = to_goldfish_pipe_dev(file); unsigned long flags; int id; int status; @@ -804,9 +816,9 @@ static void write_pa_addr(void *addr, void __iomem *portl, void __iomem *porth) writel(lower_32_bits(paddr), portl); } -static int goldfish_pipe_device_init(struct platform_device *pdev) +static int goldfish_pipe_device_init(struct platform_device *pdev, + struct goldfish_pipe_dev *dev) { - struct goldfish_pipe_dev *dev = &goldfish_pipe_dev; int err; tasklet_init(&dev->irq_tasklet, &goldfish_interrupt_task, @@ -861,26 +873,29 @@ static int goldfish_pipe_device_init(struct platform_device *pdev) dev->base + PIPE_REG_OPEN_BUFFER, dev->base + PIPE_REG_OPEN_BUFFER_HIGH); + platform_set_drvdata(pdev, dev); return 0; } -static void goldfish_pipe_device_deinit(struct platform_device *pdev) +static void goldfish_pipe_device_deinit(struct platform_device *pdev, + struct goldfish_pipe_dev *dev) { - misc_deregister(&goldfish_pipe_dev.miscdev); - tasklet_kill(&goldfish_pipe_dev.irq_tasklet); - kfree(goldfish_pipe_dev.pipes); - free_page((unsigned long)goldfish_pipe_dev.buffers); + misc_deregister(&dev->miscdev); + tasklet_kill(&dev->irq_tasklet); + kfree(dev->pipes); + free_page((unsigned long)dev->buffers); } static int goldfish_pipe_probe(struct platform_device *pdev) { - int err; struct resource *r; - struct goldfish_pipe_dev *dev = &goldfish_pipe_dev; + struct goldfish_pipe_dev *dev; - /* not thread safe, but this should not happen */ - WARN_ON(dev->base); + dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL); + if (!dev) + return -ENOMEM; + dev->magic = &goldfish_pipe_device_deinit; spin_lock_init(&dev->lock); r = platform_get_resource(pdev, IORESOURCE_MEM, 0); @@ -895,10 +910,9 @@ static int goldfish_pipe_probe(struct platform_device *pdev) } r = platform_get_resource(pdev, IORESOURCE_IRQ, 0); - if (!r) { - err = -EINVAL; - goto error; - } + if (!r) + return -EINVAL; + dev->irq = r->start; /* @@ -913,20 +927,14 @@ static int goldfish_pipe_probe(struct platform_device *pdev) if (WARN_ON(dev->version < PIPE_CURRENT_DEVICE_VERSION)) return -EINVAL; - err = goldfish_pipe_device_init(pdev); - if (!err) - return 0; - -error: - dev->base = NULL; - return err; + return goldfish_pipe_device_init(pdev, dev); } static int goldfish_pipe_remove(struct platform_device *pdev) { - struct goldfish_pipe_dev *dev = &goldfish_pipe_dev; - goldfish_pipe_device_deinit(pdev); - dev->base = NULL; + struct goldfish_pipe_dev *dev = platform_get_drvdata(pdev); + + goldfish_pipe_device_deinit(pdev, dev); return 0; } |