Re: [PATCH 6.12.y v2] iio: light: opt3001: fix deadlock due to concurrent flag access

[Sasha Levin <sashal@kernel.org>]

[ Sasha's backport helper bot ]

Hi,

✅ All tests passed successfully. No issues detected.
No action required from the submitter.

The upstream commit SHA1 provided is correct: f063a28002e3350088b4577c5640882bf4ea17ea

Status in newer kernel trees:
6.14.y | Present (different SHA1: 3950887ff9a9)

Note: The patch differs from the upstream commit:
---
1:  f063a28002e33 ! 1:  99a94f9f0a69a iio: light: opt3001: fix deadlock due to concurrent flag access
    @@ Metadata
      ## Commit message ##
         iio: light: opt3001: fix deadlock due to concurrent flag access
     
    +    [ Upstream commit f063a28002e3350088b4577c5640882bf4ea17ea ]
    +
         The threaded IRQ function in this driver is reading the flag twice: once to
         lock a mutex and once to unlock it. Even though the code setting the flag
         is designed to prevent it, there are subtle cases where the flag could be
    @@ Commit message
         Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
         Link: https://patch.msgid.link/20250321-opt3001-irq-fix-v1-1-6c520d851562@bootlin.com
         Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
    +    (cherry picked from commit f063a28002e3350088b4577c5640882bf4ea17ea)
    +    [Fixed conflict while applying on 6.12]
    +    Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
     
      ## drivers/iio/light/opt3001.c ##
     @@ drivers/iio/light/opt3001.c: static irqreturn_t opt3001_irq(int irq, void *_iio)
    + 	struct opt3001 *opt = iio_priv(iio);
      	int ret;
      	bool wake_result_ready_queue = false;
    - 	enum iio_chan_type chan_type = opt->chip_info->chan_type;
     +	bool ok_to_ignore_lock = opt->ok_to_ignore_lock;
      
     -	if (!opt->ok_to_ignore_lock)
---

Results of testing on various branches:

| Branch                    | Patch Apply | Build Test |
|---------------------------|-------------|------------|
| stable/linux-6.12.y       |  Success    |  Success   |