diff options
| author | Bjorn Bringert <bringert@android.com> | 2011-12-20 16:49:49 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-12-21 13:40:22 -0800 |
| commit | 853ca7ae292f9c4809e1e42914e81453eaa15367 (patch) | |
| tree | c96ea0a3e8159b799cd22cf5b02085cfe82407cd | |
| parent | 11980c2ac4ccfad21a5f8ee9e12059f1e687bb40 (diff) | |
ashmem: Implement read(2) in ashmem driver
Signed-off-by: Bjorn Bringert <bringert@android.com>
[jstultz: Tweaked commit subject]
CC: Brian Swetland <swetland@google.com>
CC: Colin Cross <ccross@android.com>
CC: Arve Hjønnevåg <arve@android.com>
CC: Dima Zavin <dima@android.com>
CC: Robert Love <rlove@google.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/staging/android/ashmem.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/staging/android/ashmem.c b/drivers/staging/android/ashmem.c index 5775c6c779c5..6f1a0bbc9a5e 100644 --- a/drivers/staging/android/ashmem.c +++ b/drivers/staging/android/ashmem.c @@ -211,6 +211,32 @@ static int ashmem_release(struct inode *ignored, struct file *file) return 0; } +static ssize_t ashmem_read(struct file *file, char __user *buf, + size_t len, loff_t *pos) +{ + struct ashmem_area *asma = file->private_data; + int ret = 0; + + mutex_lock(&ashmem_mutex); + + /* If size is not set, or set to 0, always return EOF. */ + if (asma->size == 0) { + goto out; + } + + if (!asma->file) { + ret = -EBADF; + goto out; + } + + ret = asma->file->f_op->read(asma->file, buf, len, pos); + +out: + mutex_unlock(&ashmem_mutex); + return ret; +} + + static int ashmem_mmap(struct file *file, struct vm_area_struct *vma) { struct ashmem_area *asma = file->private_data; @@ -612,6 +638,7 @@ static struct file_operations ashmem_fops = { .owner = THIS_MODULE, .open = ashmem_open, .release = ashmem_release, + .read = ashmem_read, .mmap = ashmem_mmap, .unlocked_ioctl = ashmem_ioctl, .compat_ioctl = ashmem_ioctl, |