linux-kernel - [PATCH 2/2 v2] cxl/region: Use cond_guard() in show

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Date: Mon,  5 Feb 2024 15:26:13 +0100
From: "Fabio M. De Francesco" <fabio.maria.de.francesco@...ux.intel.com>
To: Peter Zijlstra <peterz@...radead.org>,
	Dan Williams <dan.j.williams@...el.com>,
	linux-kernel@...r.kernel.org
Cc: linux-cxl@...r.kernel.org,
	Ingo Molnar <mingo@...nel.org>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	"Fabio M. De Francesco" <fabio.maria.de.francesco@...ux.intel.com>,
	Ira Weiny <ira.weiny@...el.com>
Subject: [PATCH 2/2 v2] cxl/region: Use cond_guard() in show_targetN()

Use cond_guard() in show_target() to not open code an up_read() in an 'out'
block. If the down_read_interruptible() fails, the statement passed to the
second argument of cond_guard() returns -EINTR.

Cc: Peter Zijlstra <peterz@...radead.org>
Suggested-by: Dan Williams <dan.j.williams@...el.com>
Suggested-by: Ira Weiny <ira.weiny@...el.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: Fabio M. De Francesco <fabio.maria.de.francesco@...ux.intel.com>
---
 drivers/cxl/core/region.c | 16 ++++------------
 1 file changed, 4 insertions(+), 12 deletions(-)

diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index 0f05692bfec3..bd3236786a25 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -666,28 +666,20 @@ static size_t show_targetN(struct cxl_region *cxlr, char *buf, int pos)
 {
 	struct cxl_region_params *p = &cxlr->params;
 	struct cxl_endpoint_decoder *cxled;
-	int rc;
 
-	rc = down_read_interruptible(&cxl_region_rwsem);
-	if (rc)
-		return rc;
+	cond_guard(rwsem_read_intr, return -EINTR, &cxl_region_rwsem);
 
 	if (pos >= p->interleave_ways) {
 		dev_dbg(&cxlr->dev, "position %d out of range %d\n", pos,
 			p->interleave_ways);
-		rc = -ENXIO;
-		goto out;
+		return -ENXIO;
 	}
 
 	cxled = p->targets[pos];
 	if (!cxled)
-		rc = sysfs_emit(buf, "\n");
+		return sysfs_emit(buf, "\n");
 	else
-		rc = sysfs_emit(buf, "%s\n", dev_name(&cxled->cxld.dev));
-out:
-	up_read(&cxl_region_rwsem);
-
-	return rc;
+		return sysfs_emit(buf, "%s\n", dev_name(&cxled->cxld.dev));
 }
 
 static int match_free_decoder(struct device *dev, void *data)
-- 
2.43.0