linux-kernel - [PATCH 3/3] cxl/region: Use cond_guard() in show

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Message-ID: <170905254443.2268463.935306988251313983.stgit@dwillia2-xfh.jf.intel.com>
Date: Tue, 27 Feb 2024 08:49:04 -0800
From: Dan Williams <dan.j.williams@...el.com>
To: torvalds@...ux-foundation.org, peterz@...radead.org,
 gregkh@...uxfoundation.org
Cc: Ira Weiny <ira.weiny@...el.com>, Dave Jiang <dave.jiang@...el.com>,
 Ira Weiny <ira.weiny@...el.com>,
 Jonathan Cameron <Jonathan.Cameron@...wei.com>,
 "Fabio M. De Francesco" <fabio.maria.de.francesco@...ux.intel.com>,
 linux-kernel@...r.kernel.org, linux-cxl@...r.kernel.org
Subject: [PATCH 3/3] cxl/region: Use cond_guard() in show_targetN()

From: Fabio M. De Francesco <fabio.maria.de.francesco@...ux.intel.com>

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: Dave Jiang <dave.jiang@...el.com>
Reviewed-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>
Signed-off-by: Dan Williams <dan.j.williams@...el.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 ce0e2d82bb2b..704102f75c14 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");
-	else
-		rc = sysfs_emit(buf, "%s\n", dev_name(&cxled->cxld.dev));
-out:
-	up_read(&cxl_region_rwsem);
+		return sysfs_emit(buf, "\n");

-	return rc;
+	return sysfs_emit(buf, "%s\n", dev_name(&cxled->cxld.dev));
 }

 static int match_free_decoder(struct device *dev, void *data)