tpm, tpm_tis: Request threaded interrupt handler

commit 0c7e66e5fd69bf21034c9a9b081d7de7c3eb2cea upstream.

The TIS interrupt handler at least has to read and write the interrupt
status register. In case of SPI both operations result in a call to
tpm_tis_spi_transfer() which uses the bus_lock_mutex of the spi device
and thus must only be called from a sleepable context.

To ensure this request a threaded interrupt handler.

Signed-off-by: Lino Sanfilippo <l.sanfilippo@kunbus.com>
Tested-by: Michael Niewöhner <linux@mniewoehner.de>
Tested-by: Jarkko Sakkinen <jarkko@kernel.org>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
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 f02b583..e05d2b2 100644 (file)
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -805,8 +805,11 @@ static int tpm_tis_probe_irq_single(struct tpm_chip *chip, u32 intmask,
        int rc;
        u32 int_status;
 
-       if (devm_request_irq(chip->dev.parent, irq, tis_int_handler, flags,
-                            dev_name(&chip->dev), chip) != 0) {
+
+       rc = devm_request_threaded_irq(chip->dev.parent, irq, NULL,
+                                      tis_int_handler, IRQF_ONESHOT | flags,
+                                      dev_name(&chip->dev), chip);
+       if (rc) {
                dev_info(&chip->dev, "Unable to request irq: %d for probe\n",
                         irq);
                return -1;