[U-Boot] [PATCH v2] test: ums: Add sleep before unmount directory

[Wolfgang Denk]

Dear Lukasz,

In message <1415365555-9790-1-git-send-email-l.majewski at samsung.com> you wrote:
>
> -    umount $MNT_DIR
>  
> +    while true; do
> +	umount $MNT_DIR > /dev/null 2>&1
> +	if [ $? -eq 0 ]; then
> +	    break
> +	fi
> +	printf "$COLOUR_ORANGE\tSleeping to wait for umount...$COLOUR_DEFAULT\n"
> +	sleep 1
> +    done

As Marek already pointed out, umount (both the command (8) and the
syscall (2)) are supposed to be blocking (except for typical error
cases like no permission, mountpoint does not exist, no file system
mounted, etc.).

If you really ever see the umount entering above loop, then there is
some bug somewhere.  It would be indeed interesting to see the strace
log for such umount calls.  Also, can you please add details about the
exact execution environment (host system / architecture, kernel
version, distro, and _especially_ which sort of USB driver is involved
here.

My gut feeling is that there might be some USB driver error involved
here.

Best regards,

Wolfgang Denk

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