Re: [PATCH v3 06/11] s390: cio: Use driver_set_override() instead of open-coding

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On 2/27/22 14:52, Krzysztof Kozlowski wrote:
Use a helper for seting driver_override to reduce amount of duplicated
code. Make the driver_override field const char, because it is not
modified by the core and it matches other subsystems.
s/seting/setting/

Also could you please change the title to start with "s390/cio:"
instead of "s390 : cio"

Otherwise,

Acked-by: Vineeth Vijayan <vneethv@xxxxxxxxxxxxx>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxxxxx>
---
  drivers/s390/cio/cio.h |  7 ++++++-
  drivers/s390/cio/css.c | 28 ++++------------------------
  2 files changed, 10 insertions(+), 25 deletions(-)

diff --git a/drivers/s390/cio/cio.h b/drivers/s390/cio/cio.h
index 1cb9daf9c645..e110c10613e8 100644
--- a/drivers/s390/cio/cio.h
+++ b/drivers/s390/cio/cio.h
@@ -103,7 +103,12 @@ struct subchannel {
  	struct work_struct todo_work;
  	struct schib_config config;
  	u64 dma_mask;
-	char *driver_override; /* Driver name to force a match */
+	/*
+	 * Driver name to force a match.
+	 * Do not set directly, because core frees it.
+	 * Use driver_set_override() to set or clear it.
+	 */
As Bjorn Helgaas mentioned, please wrap this comment.
+	const char *driver_override;
  } __attribute__ ((aligned(8)));
DECLARE_PER_CPU_ALIGNED(struct irb, cio_irb);
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index fa8293335077..913b6ddd040b 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -338,31 +338,11 @@ static ssize_t driver_override_store(struct device *dev,
  				     const char *buf, size_t count)
  {
  	struct subchannel *sch = to_subchannel(dev);
-	char *driver_override, *old, *cp;
-
-	/* We need to keep extra room for a newline */
-	if (count >= (PAGE_SIZE - 1))
-		return -EINVAL;
-
-	driver_override = kstrndup(buf, count, GFP_KERNEL);
-	if (!driver_override)
-		return -ENOMEM;
-
-	cp = strchr(driver_override, '\n');
-	if (cp)
-		*cp = '\0';
-
-	device_lock(dev);
-	old = sch->driver_override;
-	if (strlen(driver_override)) {
-		sch->driver_override = driver_override;
-	} else {
-		kfree(driver_override);
-		sch->driver_override = NULL;
-	}
-	device_unlock(dev);
+	int ret;
- kfree(old);
+	ret = driver_set_override(dev, &sch->driver_override, buf, count);
+	if (ret)
+		return ret;
return count;
  }



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