[PATCH] virtio_console: Fix alloc_buf(.gfp) usage

[Peter Zijlstra <peterz@infradead.org>]

Commit fc220d6be3c7 ("virtio_console: refactor __send_to_port() buffer
ownership") added a .gfp argument to alloc_buf(), but forgot to convert
all allocation calls.

The result is that any GFP_ATOMIC calls, such as those from:

  hvc_console_print()
    put_chars()
      alloc_buf(.gfp = GFP_ATOMIC)

will trip the might_sleep_if() check when used from an atomic context.

Fixes: fc220d6be3c7 ("virtio_console: refactor __send_to_port() buffer
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---

diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 62eecfa61646..7f6cbe851d1e 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -426,7 +426,7 @@ static struct port_buffer *alloc_buf(struct virtio_device *vdev, size_t buf_size
 	 * Allocate buffer and the sg list. The sg list array is allocated
 	 * directly after the port_buffer struct.
 	 */
-	buf = kmalloc_flex(*buf, sg, pages);
+	buf = kmalloc_flex(*buf, sg, pages, gfp);
 	if (!buf)
 		goto fail;