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.
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.
+ */
+ 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;
}
--
2.32.0
