Re: [PATCH 2/2] add irq validity check in tpm_i2c_nuvoton driver

[Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>]

On Wed, Jun 29, 2016 at 05:03:39PM +0300, Jarkko Sakkinen wrote:
> On Wed, Jun 29, 2016 at 12:58:49PM +0300, andrew zamansky wrote:
> > if irq==0 (actualy invalid value) then error is printed to dmesg after
> > trying to register to 0 interrupt 
> > 
> >  drivers/char/tpm/tpm_i2c_nuvoton.c | 4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/char/tpm/tpm_i2c_nuvoton.c b/drivers/char/tpm/tpm_i2c_nuvoton.c
> > index 75a80e466..3081529 100644
> > +++ b/drivers/char/tpm/tpm_i2c_nuvoton.c
> > @@ -554,7 +554,9 @@ static int i2c_nuvoton_probe(struct i2c_client *client,
> >  	 *   TPM_INTF_INT_LEVEL_LOW | TPM_INTF_DATA_AVAIL_INT
> >  	 * The IRQ should be set in the i2c_board_info (which is done
> >  	 * automatically in of_i2c_register_devices, for device tree users */
> > -	chip->flags |= TPM_CHIP_FLAG_IRQ;
> > +	if(chip->flags)
> > +		chip->flags |= TPM_CHIP_FLAG_IRQ;
> > +
> >  	priv->irq = client->irq;
> >  
> >  	if (chip->flags & TPM_CHIP_FLAG_IRQ) {
> 
> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
> 
> PS. There's a style error. "if()" should be "if ()". I don't mind fixing
> that. Just remember that next time.

Andrew/Jarkko:

Uhm, this looks wrong to me.. The original code was like this:

-       chip->vendor.irq = client->irq;
-       if (chip->vendor.irq) {

And was wrongly changed to this:

+       chip->flags |= TPM_CHIP_FLAG_IRQ;
+       priv->irq = client->irq;
+       if (chip->flags & TPM_CHIP_FLAG_IRQ) {

Jarkko, can you fold this into the patch to fix it please:

diff --git a/drivers/char/tpm/tpm_i2c_nuvoton.c b/drivers/char/tpm/tpm_i2c_nuvoton.c
index e63ea1652d8d..826698234336 100644
--- a/drivers/char/tpm/tpm_i2c_nuvoton.c
+++ b/drivers/char/tpm/tpm_i2c_nuvoton.c
@@ -559,12 +559,8 @@ static int i2c_nuvoton_probe(struct i2c_client *client,
 	 *   TPM_INTF_INT_LEVEL_LOW | TPM_INTF_DATA_AVAIL_INT
 	 * The IRQ should be set in the i2c_board_info (which is done
 	 * automatically in of_i2c_register_devices, for device tree users */
-	if(chip->flags)
-		chip->flags |= TPM_CHIP_FLAG_IRQ;
-
 	priv->irq = client->irq;
-
-	if (chip->flags & TPM_CHIP_FLAG_IRQ) {
+	if (client->irq) {
 		dev_dbg(dev, "%s() priv->irq\n", __func__);
 		rc = devm_request_irq(dev, client->irq,
 				      i2c_nuvoton_int_handler,
@@ -574,9 +570,9 @@ static int i2c_nuvoton_probe(struct i2c_client *client,
 		if (rc) {
 			dev_err(dev, "%s() Unable to request irq: %d for use\n",
 				__func__, priv->irq);
-			chip->flags &= ~TPM_CHIP_FLAG_IRQ;
 			priv->irq = 0;
 		} else {
+			chip->flags |= TPM_CHIP_FLAG_IRQ;
 			/* Clear any pending interrupt */
 			i2c_nuvoton_ready(chip);
 			/* - wait for TPM_STS==0xA0 (stsValid, commandReady) */

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