tpm/tpm_tis: Free IRQ if probing fails

commit b160c94be5d2816b62c8ac338605668304242959 upstream.

Call disable_interrupts() if we have to revert to polling in order not to
unnecessarily reserve the IRQ for the life-cycle of the driver.

Cc: stable@vger.kernel.org # 4.5.x
Reported-by: Hans de Goede <hdegoede@redhat.com>
Fixes: e3837e74a06d ("tpm_tis: Refactor the interrupt setup")
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index f9aa47ec7af79567dc5700630852f83193c50e4d..b78f6a347f29420a1d4fd6ebacd9f7c523cfd406 100644 (file)
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -329,6 +329,9 @@ static void disable_interrupts(struct tpm_chip *chip)
        u32 intmask;
        int rc;
 
+       if (priv->irq == 0)
+               return;
+
        rc = tpm_tis_read32(priv, TPM_INT_ENABLE(priv->locality), &intmask);
        if (rc < 0)
                intmask = 0;
@@ -786,9 +789,12 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
                if (irq) {
                        tpm_tis_probe_irq_single(chip, intmask, IRQF_SHARED,
                                                 irq);
-                       if (!(chip->flags & TPM_CHIP_FLAG_IRQ))
+                       if (!(chip->flags & TPM_CHIP_FLAG_IRQ)) {
                                dev_err(&chip->dev, FW_BUG
                                        "TPM interrupt not working, polling instead\n");
+
+                               disable_interrupts(chip);
+                       }
                } else {
                        tpm_tis_probe_irq(chip, intmask);
                }