1 files changed, 10 insertions, 1 deletions

diff --git a/arch/um/drivers/chan_user.c b/arch/um/drivers/chan_user.c
index 77557e233f58..d29e56d8ced4 100644
--- a/arch/um/drivers/chan_user.c
+++ b/arch/um/drivers/chan_user.c
@@ -38,7 +38,16 @@ int generic_read(int fd, char *c_out, void *unused)
 
 int generic_write(int fd, const char *buf, int n, void *unused)
 {
-        return write(fd, buf, n);
+        int err;
+
+        err = write(fd, buf, n);
+        if (err > 0)
+                return err;
+        else if (errno == EAGAIN)
+                return 0;
+        else if (err == 0)
+                return -EIO;
+        return -errno;
 }
 
 int generic_window_size(int fd, void *unused, unsigned short *rows_out,