diff options
| author |   Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> | 2012-08-09 21:31:00 +0900 |
|---|---|---|
| committer |   Rusty Russell <rusty@rustcorp.com.au> | 2012-09-28 15:05:12 +0930 |
| commit | efe75d24a69fc39bb09d882ca2d5b90d4da02afe (patch) | |
| tree | 03424fc85d6ca93ca6522dd1f6b11efd52252191 /drivers/char/virtio_console.c | |
| parent | virtio/console: Add a failback for unstealable pipe buffer (diff) | |
| download | linux-dev-efe75d24a69fc39bb09d882ca2d5b90d4da02afe.tar.xz linux-dev-efe75d24a69fc39bb09d882ca2d5b90d4da02afe.zip | |
virtio/console: Wait until the port is ready on splice
Wait if the port is not connected or full on splice
like as write is doing.
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/char/virtio_console.c')
| -rw-r--r-- | drivers/char/virtio_console.c | 39 |
1 files changed, 27 insertions, 12 deletions
diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index 22b737353017..b2fc2abedc79 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -724,6 +724,26 @@ static ssize_t port_fops_read(struct file *filp, char __user *ubuf, return fill_readbuf(port, ubuf, count, true); } +static int wait_port_writable(struct port *port, bool nonblock) +{ + int ret; + + if (will_write_block(port)) { + if (nonblock) + return -EAGAIN; + + ret = wait_event_freezable(port->waitqueue, + !will_write_block(port)); + if (ret < 0) + return ret; + } + /* Port got hot-unplugged. */ + if (!port->guest_connected) + return -ENODEV; + + return 0; +} + static ssize_t port_fops_write(struct file *filp, const char __user *ubuf, size_t count, loff_t *offp) { @@ -740,18 +760,9 @@ static ssize_t port_fops_write(struct file *filp, const char __user *ubuf, nonblock = filp->f_flags & O_NONBLOCK; - if (will_write_block(port)) { - if (nonblock) - return -EAGAIN; - - ret = wait_event_freezable(port->waitqueue, - !will_write_block(port)); - if (ret < 0) - return ret; - } - /* Port got hot-unplugged. */ - if (!port->guest_connected) - return -ENODEV; + ret = wait_port_writable(port, nonblock); + if (ret < 0) + return ret; count = min((size_t)(32 * 1024), count); @@ -851,6 +862,10 @@ static ssize_t port_fops_splice_write(struct pipe_inode_info *pipe, .u.data = &sgl, }; + ret = wait_port_writable(port, filp->f_flags & O_NONBLOCK); + if (ret < 0) + return ret; + sgl.n = 0; sgl.len = 0; sgl.sg = kmalloc(sizeof(struct scatterlist) * MAX_SPLICE_PAGES, |