[PATCH v2 2/4] devcoredump: Add dev_coredumpm_timeout()

[José Roberto de Souza]

Add function to set a custom coredump timeout.

Current 5-minute timeout may be too short for users to search and
understand what needs to be done to capture coredump to report bugs.

v2:
- replace dev_coredump_timeout_set() by dev_coredumpm_timeout() (Mukesh)

Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Cc: Mukesh Ojha <quic_mojha@xxxxxxxxxxx>
Cc: Johannes Berg <johannes@xxxxxxxxxxxxxxxx>
Cc: Jonathan Cavitt <jonathan.cavitt@xxxxxxxxx>
Signed-off-by: José Roberto de Souza <jose.souza@xxxxxxxxx>
---
 drivers/base/devcoredump.c  | 44 +++++++++++++++++++++++++++++++------
 include/linux/devcoredump.h | 18 +++++++++++++++
 2 files changed, 55 insertions(+), 7 deletions(-)

diff --git a/drivers/base/devcoredump.c b/drivers/base/devcoredump.c
index 82aeb09b3d1b5..07b89f7f735d8 100644
--- a/drivers/base/devcoredump.c
+++ b/drivers/base/devcoredump.c
@@ -328,7 +328,8 @@ void dev_coredump_put(struct device *dev)
 EXPORT_SYMBOL_GPL(dev_coredump_put);
 
 /**
- * dev_coredumpm - create device coredump with read/free methods
+ * dev_coredumpm_timeout - create device coredump with read/free methods with a
+ * custom timeout.
  * @dev: the struct device for the crashed device
  * @owner: the module that contains the read/free functions, use %THIS_MODULE
  * @data: data cookie for the @read/@free functions
@@ -336,17 +337,20 @@ EXPORT_SYMBOL_GPL(dev_coredump_put);
  * @gfp: allocation flags
  * @read: function to read from the given buffer
  * @free: function to free the given buffer
+ * @timeout: time in jiffies to remove coredump
  *
  * Creates a new device coredump for the given device. If a previous one hasn't
  * been read yet, the new coredump is discarded. The data lifetime is determined
  * by the device coredump framework and when it is no longer needed the @free
  * function will be called to free the data.
  */
-void dev_coredumpm(struct device *dev, struct module *owner,
-		   void *data, size_t datalen, gfp_t gfp,
-		   ssize_t (*read)(char *buffer, loff_t offset, size_t count,
-				   void *data, size_t datalen),
-		   void (*free)(void *data))
+void dev_coredumpm_timeout(struct device *dev, struct module *owner,
+			   void *data, size_t datalen, gfp_t gfp,
+			   ssize_t (*read)(char *buffer, loff_t offset,
+					   size_t count, void *data,
+					   size_t datalen),
+			   void (*free)(void *data),
+			   unsigned long timeout)
 {
 	static atomic_t devcd_count = ATOMIC_INIT(0);
 	struct devcd_entry *devcd;
@@ -403,7 +407,7 @@ void dev_coredumpm(struct device *dev, struct module *owner,
 	dev_set_uevent_suppress(&devcd->devcd_dev, false);
 	kobject_uevent(&devcd->devcd_dev.kobj, KOBJ_ADD);
 	INIT_DELAYED_WORK(&devcd->del_wk, devcd_del);
-	schedule_delayed_work(&devcd->del_wk, DEVCD_TIMEOUT);
+	schedule_delayed_work(&devcd->del_wk, timeout);
 	mutex_unlock(&devcd->mutex);
 	return;
  put_device:
@@ -414,6 +418,32 @@ void dev_coredumpm(struct device *dev, struct module *owner,
  free:
 	free(data);
 }
+EXPORT_SYMBOL_GPL(dev_coredumpm_timeout);
+
+/**
+ * dev_coredumpm - create device coredump with read/free methods
+ * @dev: the struct device for the crashed device
+ * @owner: the module that contains the read/free functions, use %THIS_MODULE
+ * @data: data cookie for the @read/@free functions
+ * @datalen: length of the data
+ * @gfp: allocation flags
+ * @read: function to read from the given buffer
+ * @free: function to free the given buffer
+ *
+ * Creates a new device coredump for the given device. If a previous one hasn't
+ * been read yet, the new coredump is discarded. The data lifetime is determined
+ * by the device coredump framework and when it is no longer needed the @free
+ * function will be called to free the data.
+ */
+void dev_coredumpm(struct device *dev, struct module *owner,
+		   void *data, size_t datalen, gfp_t gfp,
+		   ssize_t (*read)(char *buffer, loff_t offset, size_t count,
+				   void *data, size_t datalen),
+		   void (*free)(void *data))
+{
+	dev_coredumpm_timeout(dev, owner, data, datalen, gfp, read, free,
+			      DEVCD_TIMEOUT);
+}
 EXPORT_SYMBOL_GPL(dev_coredumpm);
 
 /**
diff --git a/include/linux/devcoredump.h b/include/linux/devcoredump.h
index c8f7eb6cc1915..5e1e4deab07a6 100644
--- a/include/linux/devcoredump.h
+++ b/include/linux/devcoredump.h
@@ -55,6 +55,14 @@ static inline void _devcd_free_sgtable(struct scatterlist *table)
 void dev_coredumpv(struct device *dev, void *data, size_t datalen,
 		   gfp_t gfp);
 
+void dev_coredumpm_timeout(struct device *dev, struct module *owner,
+			   void *data, size_t datalen, gfp_t gfp,
+			   ssize_t (*read)(char *buffer, loff_t offset,
+					   size_t count, void *data,
+					   size_t datalen),
+			   void (*free)(void *data),
+			   unsigned long timeout);
+
 void dev_coredumpm(struct device *dev, struct module *owner,
 		   void *data, size_t datalen, gfp_t gfp,
 		   ssize_t (*read)(char *buffer, loff_t offset, size_t count,
@@ -72,6 +80,16 @@ static inline void dev_coredumpv(struct device *dev, void *data,
 	vfree(data);
 }
 
+void dev_coredumpm_timeout(struct device *dev, struct module *owner,
+			   void *data, size_t datalen, gfp_t gfp,
+			   ssize_t (*read)(char *buffer, loff_t offset,
+					   size_t count, void *data,
+					   size_t datalen),
+			   void (*free)(void *data),
+			   unsigned long timeout)
+{
+}
+
 static inline void
 dev_coredumpm(struct device *dev, struct module *owner,
 	      void *data, size_t datalen, gfp_t gfp,
-- 
2.44.0