lkml.org 
[lkml]   [2021]   [Apr]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v2 1/4] tpm: Use a threaded interrupt handler
On Mon, Apr 26, 2021 at 01:47:17AM +0200, Lino Sanfilippo wrote:
> Interrupt handling at least includes reading and writing the interrupt
> status register from the interrupt routine. However over SPI those accesses
> require a sleepable context, since a mutex is used in the concerning
> functions.
> For this reason request a threaded interrupt handler which is running in
> (sleepable) process context.
>
> Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de>
> ---
> drivers/char/tpm/tpm_tis_core.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
> index e7d1eab..0959559 100644
> --- a/drivers/char/tpm/tpm_tis_core.c
> +++ b/drivers/char/tpm/tpm_tis_core.c
> @@ -781,8 +781,10 @@ 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) {
> +
> + if (devm_request_threaded_irq(chip->dev.parent, irq, NULL,
> + tis_int_handler, IRQF_ONESHOT | flags,
> + dev_name(&chip->dev), chip) != 0) {
> dev_info(&chip->dev, "Unable to request irq: %d for probe\n",
> irq);
> return -1;
> --
> 2.7.4
>

Why?

https://elixir.bootlin.com/linux/v5.12/source/drivers/char/tpm/tpm_tis_core.c#L670

I don't see anything that sleeps there.

/Jarkko1

\
 
 \ /
  Last update: 2021-04-28 01:54    [W:0.190 / U:3.672 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site