diff options
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/virtio_console.c | 23 |
1 files changed, 12 insertions, 11 deletions
diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index b2fc2abedc79..e88f84390428 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -229,7 +229,6 @@ struct port { bool guest_connected; }; -#define MAX_SPLICE_PAGES 32 /* This is the very early arch-specified put chars function. */ static int (*early_put_chars)(u32, const char *, int); @@ -482,15 +481,16 @@ struct buffer_token { void *buf; struct scatterlist *sg; } u; - bool sgpages; + /* If sgpages == 0 then buf is used, else sg is used */ + unsigned int sgpages; }; -static void reclaim_sg_pages(struct scatterlist *sg) +static void reclaim_sg_pages(struct scatterlist *sg, unsigned int nrpages) { int i; struct page *page; - for (i = 0; i < MAX_SPLICE_PAGES; i++) { + for (i = 0; i < nrpages; i++) { page = sg_page(&sg[i]); if (!page) break; @@ -511,7 +511,7 @@ static void reclaim_consumed_buffers(struct port *port) } while ((tok = virtqueue_get_buf(port->out_vq, &len))) { if (tok->sgpages) - reclaim_sg_pages(tok->u.sg); + reclaim_sg_pages(tok->u.sg, tok->sgpages); else kfree(tok->u.buf); kfree(tok); @@ -581,7 +581,7 @@ static ssize_t send_buf(struct port *port, void *in_buf, size_t in_count, tok = kmalloc(sizeof(*tok), GFP_ATOMIC); if (!tok) return -ENOMEM; - tok->sgpages = false; + tok->sgpages = 0; tok->u.buf = in_buf; sg_init_one(sg, in_buf, in_count); @@ -597,7 +597,7 @@ static ssize_t send_pages(struct port *port, struct scatterlist *sg, int nents, tok = kmalloc(sizeof(*tok), GFP_ATOMIC); if (!tok) return -ENOMEM; - tok->sgpages = true; + tok->sgpages = nents; tok->u.sg = sg; return __send_to_port(port, sg, nents, in_count, tok, nonblock); @@ -797,6 +797,7 @@ out: struct sg_list { unsigned int n; + unsigned int size; size_t len; struct scatterlist *sg; }; @@ -807,7 +808,7 @@ static int pipe_to_sg(struct pipe_inode_info *pipe, struct pipe_buffer *buf, struct sg_list *sgl = sd->u.data; unsigned int offset, len; - if (sgl->n == MAX_SPLICE_PAGES) + if (sgl->n == sgl->size) return 0; /* Try lock this page */ @@ -868,12 +869,12 @@ static ssize_t port_fops_splice_write(struct pipe_inode_info *pipe, sgl.n = 0; sgl.len = 0; - sgl.sg = kmalloc(sizeof(struct scatterlist) * MAX_SPLICE_PAGES, - GFP_KERNEL); + sgl.size = pipe->nrbufs; + sgl.sg = kmalloc(sizeof(struct scatterlist) * sgl.size, GFP_KERNEL); if (unlikely(!sgl.sg)) return -ENOMEM; - sg_init_table(sgl.sg, MAX_SPLICE_PAGES); + sg_init_table(sgl.sg, sgl.size); ret = __splice_from_pipe(pipe, &sd, pipe_to_sg); if (likely(ret > 0)) ret = send_pages(port, sgl.sg, sgl.n, sgl.len, true); |