[PATCH] tpm_tis: don't flush never initialized work

[Jan Beulich]

tpm_tis_core_init() may fail before tpm_tis_probe_irq_single() is
called, in which case tpm_tis_remove() unconditionally calling
flush_work() is triggering a warning for .func still being NULL.

Fixes: 481c2d14627d ("tpm,tpm_tis: Disable interrupts after 1000 unhandled 
IRQs")
Signed-off-by: Jan Beulich <jbeul...@suse.com>
---
An alternative would be to move INIT_WORK(), but where to put it is far
more difficult to tell for an outsider than simply making the flush call
conditional.

--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -1022,7 +1022,8 @@ void tpm_tis_remove(struct tpm_chip *chi
                interrupt = 0;
 
        tpm_tis_write32(priv, reg, ~TPM_GLOBAL_INT_ENABLE & interrupt);
-       flush_work(&priv->free_irq_work);
+       if (priv->free_irq_work.func)
+               flush_work(&priv->free_irq_work);
 
        tpm_tis_clkrun_enable(chip, false);