From: Davidlohr Bueso <dave@stgolabs.net>
To: Dave Jiang <dave.jiang@intel.com>
Cc: linux-cxl@vger.kernel.org, dan.j.williams@intel.com,
ira.weiny@intel.com, vishal.l.verma@intel.com,
alison.schofield@intel.com, Jonathan.Cameron@huawei.com
Subject: Re: [PATCH v4 1/3] cxl: Remove checking of iter in cxl_endpoint_get_perf_coordinates()
Date: Sun, 10 Mar 2024 16:01:49 -0700 [thread overview]
Message-ID: <20240310230149.2ybcqrrh6rvp4ohj@offworld> (raw)
In-Reply-To: <20240307230432.2006490-1-dave.jiang@intel.com>
On Thu, 07 Mar 2024, Dave Jiang wrote:
>The while() loop in cxl_endpoint_get_perf_coordinates() checks to see if
>'iter' is valid as part of the condition breaking out of the loop. However,
>iter is being used before the check at the end of the while loop before
>the next iteration starts. Given that the loop doesn't expect the iter to
>be NULL because it stops before the root port, remove the iter check.
>
>The presence of the iter or removing the iter does not impact the behavior
>of the code. This is a code clean up and not a bug fix.
>
For the whole series:
Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
>Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
>Signed-off-by: Dave Jiang <dave.jiang@intel.com>
>---
> drivers/cxl/core/port.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c
>index e59d9d37aa65..e1d30a885700 100644
>--- a/drivers/cxl/core/port.c
>+++ b/drivers/cxl/core/port.c
>@@ -2142,7 +2142,7 @@ int cxl_endpoint_get_perf_coordinates(struct cxl_port *port,
> * port each iteration. If the parent is cxl root then there is
> * nothing to gather.
> */
>- while (iter && !is_cxl_root(to_cxl_port(iter->dev.parent))) {
>+ while (!is_cxl_root(to_cxl_port(iter->dev.parent))) {
> combine_coordinates(&c, &dport->sw_coord);
> c.write_latency += dport->link_latency;
> c.read_latency += dport->link_latency;
>--
>2.44.0
>
prev parent reply other threads:[~2024-03-10 23:01 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-07 23:04 [PATCH v4 1/3] cxl: Remove checking of iter in cxl_endpoint_get_perf_coordinates() Dave Jiang
2024-03-07 23:04 ` [PATCH v4 2/3] cxl: Consolidate dport access_coordinate ->hb_coord and ->sw_coord into ->coord Dave Jiang
2024-03-07 23:04 ` [PATCH v4 3/3] cxl: Add checks to access_coordinate calculation to fail missing data Dave Jiang
2024-03-10 23:01 ` Davidlohr Bueso [this message]
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