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Subject[PATCH] driver core: Have dev_err_probe() handle the dev_fmt() macro
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dev_err() and co. functions handle the dev_fmt() macro if it is defined.
This helps to have a common prefix for all messages generated with this
API.

dev_err_probe() looks like dev_err() but, up to now, does not expand the
dev_fmt() macro.

Add it.

Suggested-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
---
Example of where it would be useful is discussed at:
https://lore.kernel.org/all/aaeba9c12ccdb29f48fe19137cb5abeea85fbb24.1659732652.git.christophe.jaillet@wanadoo.fr/


I've left the kerneldoc in the .c file near _dev_err_probe(). I don't know
if it should be moved in the .h file close to dev_err_probe().
---
drivers/base/core.c | 7 +++++--
include/linux/device.h | 4 +++-
2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 753e7cca0f40..89cab273a7b5 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -4830,6 +4830,9 @@ define_dev_printk_level(_dev_info, KERN_INFO);
*
* return dev_err_probe(dev, err, ...);
*
+ * Just as dev_err() does, dev_err_probe() also takes the dev_fmt() macro into
+ * consideration if it is defined.
+ *
* Note that it is deemed acceptable to use this function for error
* prints during probe even if the @err is known to never be -EPROBE_DEFER.
* The benefit compared to a normal dev_err() is the standardized format
@@ -4838,7 +4841,7 @@ define_dev_printk_level(_dev_info, KERN_INFO);
* Returns @err.
*
*/
-int dev_err_probe(const struct device *dev, int err, const char *fmt, ...)
+int _dev_err_probe(const struct device *dev, int err, const char *fmt, ...)
{
struct va_format vaf;
va_list args;
@@ -4858,7 +4861,7 @@ int dev_err_probe(const struct device *dev, int err, const char *fmt, ...)

return err;
}
-EXPORT_SYMBOL_GPL(dev_err_probe);
+EXPORT_SYMBOL_GPL(_dev_err_probe);

static inline bool fwnode_is_primary(struct fwnode_handle *fwnode)
{
diff --git a/include/linux/device.h b/include/linux/device.h
index 424b55df0272..412a0ee2d44e 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -1093,7 +1093,9 @@ void device_links_supplier_sync_state_pause(void);
void device_links_supplier_sync_state_resume(void);

extern __printf(3, 4)
-int dev_err_probe(const struct device *dev, int err, const char *fmt, ...);
+int _dev_err_probe(const struct device *dev, int err, const char *fmt, ...);
+#define dev_err_probe(dev, err, fmt, ...) \
+ _dev_err_probe(dev, err, dev_fmt(fmt), ##__VA_ARGS__)

/* Create alias, so I can be autoloaded. */
#define MODULE_ALIAS_CHARDEV(major,minor) \
--
2.34.1
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