[PATCH v2] i2c: rk3x: fix potential spinlock recursion on poll

[Wolfram Sang]

On Thu, Dec 07, 2023 at 04:21:59PM +0800, Jensen Huang wrote:
> Possible deadlock scenario (on reboot):
> rk3x_i2c_xfer_common(polling)
>     -> rk3x_i2c_wait_xfer_poll()
>         -> rk3x_i2c_irq(0, i2c);
>             --> spin_lock(&i2c->lock);
>             ...
>         <rk3x i2c interrupt>
>         -> rk3x_i2c_irq(0, i2c);
>             --> spin_lock(&i2c->lock); (deadlock here)
> 
> Store the IRQ number and disable/enable it around the polling transfer.
> This patch has been tested on NanoPC-T4.
> 
> Signed-off-by: Jensen Huang <jensenhuang at friendlyarm.com>
> Reviewed-by: Heiko Stuebner <heiko at sntech.de>
> Reviewed-by: Andi Shyti <andi.shyti at kernel.org>

Applied to for-current, thanks!

But I'd like to see the follow-up patches somewhen which have been
discussed in this thread.

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 833 bytes
Desc: not available
URL: <http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20231219/3b69865e/attachment-0001.sig>