Re: [PATCH] tpm: tpm_tis_spi: Use wait_woken() in wait_for_tmp_stat()

[Jarkko Sakkinen]

On Sun, May 10, 2026 at 10:45:52PM +0200, Stefan Wahren wrote:
> Am 09.05.26 um 20:51 schrieb Jarkko Sakkinen:
> > wait_event_interruptible_timeout() evaluates its condition after setting
> > the current task state to TASK_INTERRUPTIBLE.
> > 
> > With CONFIG_DEBUG_ATOMIC_SLEEP this triggers a warning when the IRQ wait
> > path is used:
> > 
> >      tpm_tis_status()
> >        tpm_tis_spi_read_bytes()
> >          tpm_tis_spi_transfer_full()
> >            spi_bus_lock()
> >              mutex_lock()
> > 
> > Address this with the following measures:
> > 
> > 1. Call wait_tpm_stat_cond() only while tasking is running.
> > 2. Use wait_woken() to wait for changes.
> > 
> > Cc: stable@xxxxxxxxxxxxxxx # v4.19+
> > Cc: Linus Walleij <linusw@xxxxxxxxxx>
> > Reported-by: Stefan Wahren <wahrenst@xxxxxxx>
> > Closes: https://lore.kernel.org/linux-integrity/6964bec7-3dbb-453b-89ef-9b990217a8b9@xxxxxxx/
> > Fixes: 1a339b658d9d ("tpm_tis_spi: Pass the SPI IRQ down to the driver")
> > Signed-off-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx>
> > 
> The issue isn't reproducible anymore. Thanks
> 
> Tested-by: Stefan Wahren <wahrenst@xxxxxxx>

Thank you.

BR, Jarkko