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[v2,04/11] chardev: Assert backend's chr_can_read() is positive

Message ID 20181012002217.2864-5-philmd@redhat.com
State New
Headers show
Series chardev: Convert IO handlers to use unsigned type | expand

Commit Message

Philippe Mathieu-Daudé Oct. 12, 2018, 12:22 a.m. UTC 
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 chardev/char.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
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Patch

diff --git a/chardev/char.c b/chardev/char.c
index e115166995..952f9c9bcc 100644
--- a/chardev/char.c
+++ b/chardev/char.c
@@ -159,12 +159,15 @@  int qemu_chr_write(Chardev *s, const uint8_t *buf, int len, bool write_all)
 int qemu_chr_be_can_write(Chardev *s)
 {
     CharBackend *be = s->be;
+    int res;
 
     if (!be || !be->chr_can_read) {
         return 0;
     }
 
-    return be->chr_can_read(be->opaque);
+    res = be->chr_can_read(be->opaque);
+    assert(res >= 0);
+    return res;
 }
 
 void qemu_chr_be_write_impl(Chardev *s, uint8_t *buf, int len)