diff mbox series

[4.14,057/117] tpm/tpm_tis: Free IRQ if probing fails

Message ID 20200501131552.384123088@linuxfoundation.org
State Superseded
Headers show
Series None | expand

Commit Message

Greg Kroah-Hartman May 1, 2020, 1:21 p.m. UTC 
From: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>

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>

---
 drivers/char/tpm/tpm_tis_core.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)
diff mbox series

Patch

--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -331,6 +331,9 @@  static void disable_interrupts(struct tp
 	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;
@@ -874,9 +877,12 @@  int tpm_tis_core_init(struct device *dev
 		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);
 		}