[PATCH v14 01/28] coresight: Fix source not disabled on idr_alloc_u32 failure

[Yeoreum Yun]

LGTM.

Reviewed-by: Yeoreum Yun <yeoreum.yun at arm.com>

On Fri, May 15, 2026 at 09:08:08PM +0100, Leo Yan wrote:
> From: Jie Gan <jie.gan at oss.qualcomm.com>
> 
> In coresight_enable_sysfs(), for non-CPU sources (SOFTWARE, TPDM,
> OTHERS), the source device is enabled via coresight_enable_source_sysfs()
> before idr_alloc_u32() maps the path. If idr_alloc_u32() fails, the
> original code jumped directly to err_source, which only calls
> coresight_disable_path() and coresight_release_path(). The source device
> was left enabled with an incremented refcnt but no path tracked for it,
> leaving the device in an inconsistent state.
> 
> Disable the source before jumping to err_source so the enable and path
> operations are fully unwound.
> 
> Fixes: 5c0016d7b343 ("coresight: core: Use IDR for non-cpu bound sources' paths.")
> Signed-off-by: Jie Gan <jie.gan at oss.qualcomm.com>
> ---
>  drivers/hwtracing/coresight/coresight-sysfs.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-sysfs.c b/drivers/hwtracing/coresight/coresight-sysfs.c
> index b6a870399e83419dce0552099562fa3ae7b2bd69..da6f22b512c92ab0cff5bb239495a1ab6d2a0dbe 100644
> --- a/drivers/hwtracing/coresight/coresight-sysfs.c
> +++ b/drivers/hwtracing/coresight/coresight-sysfs.c
> @@ -244,8 +244,10 @@ int coresight_enable_sysfs(struct coresight_device *csdev)
>  		 */
>  		hash = hashlen_hash(hashlen_string(NULL, dev_name(&csdev->dev)));
>  		ret = idr_alloc_u32(&path_idr, path, &hash, hash, GFP_KERNEL);
> -		if (ret)
> +		if (ret) {
> +			coresight_disable_source_sysfs(csdev, NULL);
>  			goto err_source;
> +		}
>  		break;
>  	default:
>  		/* We can't be here */
> 
> -- 
> 2.34.1
> 

-- 
Sincerely,
Yeoreum Yun