losetup: don't clear FD at EBUSY error in loopcxt_setup_device()

loopback lib clears the existing FD unconditionally at error in
loopcxt_setup_device().  This is done even after EBUSY, thus the second call
actually clears the previous setup wrongly.

Author:  Takashi Iwai <tiwai@suse.de>
Signed-off-by: Stanislav Brabec <sbrabec@suse.cz>

diff --git a/lib/loopdev.c b/lib/loopdev.c
index 1fbb000c42ab1c6ce7811c305319cce2169023fc..988f3d337aefa40a4ee81521a6f71c2ccd9c657e 100644 (file)
--- a/lib/loopdev.c
+++ b/lib/loopdev.c
@@ -1294,7 +1294,7 @@ int loopcxt_setup_device(struct loopdev_cxt *lc)
 err:
        if (file_fd >= 0)
                close(file_fd);
-       if (dev_fd >= 0)
+       if (dev_fd >= 0 && rc != -EBUSY)
                ioctl(dev_fd, LOOP_CLR_FD, 0);
 
        DBG(lc, loopdev_debug("setup failed [rc=%d]", rc));