From e09b41010ba33a20a87472ee821fa407a5b8da36 Mon Sep 17 00:00:00 2001 From: José Pekkarinen Date: Mon, 11 Apr 2016 10:41:07 +0300 Subject: These changes are the raw update to linux-4.4.6-rt14. Kernel sources are taken from kernel.org, and rt patch from the rt wiki download page. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit During the rebasing, the following patch collided: Force tick interrupt and get rid of softirq magic(I70131fb85). Collisions have been removed because its logic was found on the source already. Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769 Signed-off-by: José Pekkarinen --- kernel/drivers/dma-buf/dma-buf.c | 19 ++++++++++++++++--- 1 file changed, 16 insertions(+), 3 deletions(-) (limited to 'kernel/drivers/dma-buf/dma-buf.c') diff --git a/kernel/drivers/dma-buf/dma-buf.c b/kernel/drivers/dma-buf/dma-buf.c index c5a9138a6..155c14649 100644 --- a/kernel/drivers/dma-buf/dma-buf.c +++ b/kernel/drivers/dma-buf/dma-buf.c @@ -29,6 +29,7 @@ #include #include #include +#include #include #include #include @@ -72,6 +73,7 @@ static int dma_buf_release(struct inode *inode, struct file *file) if (dmabuf->resv == (struct reservation_object *)&dmabuf[1]) reservation_object_fini(dmabuf->resv); + module_put(dmabuf->owner); kfree(dmabuf); return 0; } @@ -285,6 +287,7 @@ struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info) struct reservation_object *resv = exp_info->resv; struct file *file; size_t alloc_size = sizeof(struct dma_buf); + if (!exp_info->resv) alloc_size += sizeof(struct reservation_object); else @@ -302,14 +305,20 @@ struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info) return ERR_PTR(-EINVAL); } + if (!try_module_get(exp_info->owner)) + return ERR_PTR(-ENOENT); + dmabuf = kzalloc(alloc_size, GFP_KERNEL); - if (dmabuf == NULL) + if (!dmabuf) { + module_put(exp_info->owner); return ERR_PTR(-ENOMEM); + } dmabuf->priv = exp_info->priv; dmabuf->ops = exp_info->ops; dmabuf->size = exp_info->size; dmabuf->exp_name = exp_info->exp_name; + dmabuf->owner = exp_info->owner; init_waitqueue_head(&dmabuf->poll); dmabuf->cb_excl.poll = dmabuf->cb_shared.poll = &dmabuf->poll; dmabuf->cb_excl.active = dmabuf->cb_shared.active = 0; @@ -545,7 +554,8 @@ int dma_buf_begin_cpu_access(struct dma_buf *dmabuf, size_t start, size_t len, return -EINVAL; if (dmabuf->ops->begin_cpu_access) - ret = dmabuf->ops->begin_cpu_access(dmabuf, start, len, direction); + ret = dmabuf->ops->begin_cpu_access(dmabuf, start, + len, direction); return ret; } @@ -649,7 +659,7 @@ EXPORT_SYMBOL_GPL(dma_buf_kunmap); * @dmabuf: [in] buffer that should back the vma * @vma: [in] vma for the mmap * @pgoff: [in] offset in pages where this mmap should start within the - * dma-buf buffer. + * dma-buf buffer. * * This function adjusts the passed in vma so that it points at the file of the * dma_buf operation. It also adjusts the starting pgoff and does bounds @@ -826,6 +836,7 @@ static int dma_buf_describe(struct seq_file *s) static int dma_buf_show(struct seq_file *s, void *unused) { void (*func)(struct seq_file *) = s->private; + func(s); return 0; } @@ -847,7 +858,9 @@ static struct dentry *dma_buf_debugfs_dir; static int dma_buf_init_debugfs(void) { int err = 0; + dma_buf_debugfs_dir = debugfs_create_dir("dma_buf", NULL); + if (IS_ERR(dma_buf_debugfs_dir)) { err = PTR_ERR(dma_buf_debugfs_dir); dma_buf_debugfs_dir = NULL; -- cgit 1.2.3-korg