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tty: Fix unbalanced BKL handling in error path
Arnd noted: After the "retry_open:" label, we first get the tty_mutex and then the BKL. However a the end of tty_open, we jump back to retry_open with the BKL still held. If we run into this case, the tty_open function will be left with the BKL still held. Signed-off-by: Alan Cox <alan@linux.intel.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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@ -1875,6 +1875,7 @@ got_driver:
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*/
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if (filp->f_op == &hung_up_tty_fops)
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filp->f_op = &tty_fops;
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unlock_kernel();
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goto retry_open;
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}
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unlock_kernel();
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