From: Ian Pilcher <arequipeno@gmail.com>
To: axboe@kernel.dk, pavel@ucw.cz
Cc: linux-leds@vger.kernel.org, linux-block@vger.kernel.org,
linux-kernel@vger.kernel.org, gregkh@linuxfoundation.org,
kabel@kernel.org
Subject: [PATCH v2 06/15] leds: trigger: blkdev: Add function to get gendisk by name
Date: Thu, 9 Sep 2021 17:25:04 -0500 [thread overview]
Message-ID: <20210909222513.2184795-7-arequipeno@gmail.com> (raw)
In-Reply-To: <20210909222513.2184795-1-arequipeno@gmail.com>
Add ledtrig_blkdev_get_disk() to find block device by name and increment
its reference count. (Caller must call put_disk().) Must be built-in to
access block_class and disk_type symbols.
Signed-off-by: Ian Pilcher <arequipeno@gmail.com>
---
drivers/leds/trigger/ledtrig-blkdev-core.c | 20 ++++++++++++++++++++
drivers/leds/trigger/ledtrig-blkdev.h | 3 +++
2 files changed, 23 insertions(+)
diff --git a/drivers/leds/trigger/ledtrig-blkdev-core.c b/drivers/leds/trigger/ledtrig-blkdev-core.c
index d7b02e760b06..5fd741aa14a6 100644
--- a/drivers/leds/trigger/ledtrig-blkdev-core.c
+++ b/drivers/leds/trigger/ledtrig-blkdev-core.c
@@ -33,3 +33,23 @@ void ledtrig_blkdev_disk_cleanup(struct gendisk *const gd)
mutex_unlock(&ledtrig_blkdev_mutex);
}
+
+/* class_find_device() callback. Must be built-in to access disk_type. */
+static int blkdev_match_name(struct device *const dev, const void *const name)
+{
+ return dev->type == &disk_type
+ && sysfs_streq(dev_to_disk(dev)->disk_name, name);
+}
+
+/* Must be built-in to access block_class */
+struct gendisk *ledtrig_blkdev_get_disk(const char *const name)
+{
+ struct device *dev;
+
+ dev = class_find_device(&block_class, NULL, name, blkdev_match_name);
+ if (dev == NULL)
+ return NULL;
+
+ return dev_to_disk(dev);
+}
+EXPORT_SYMBOL_NS_GPL(ledtrig_blkdev_get_disk, LEDTRIG_BLKDEV);
diff --git a/drivers/leds/trigger/ledtrig-blkdev.h b/drivers/leds/trigger/ledtrig-blkdev.h
index b1294da17ba3..a6ff24fad0c2 100644
--- a/drivers/leds/trigger/ledtrig-blkdev.h
+++ b/drivers/leds/trigger/ledtrig-blkdev.h
@@ -12,4 +12,7 @@
extern struct mutex ledtrig_blkdev_mutex;
extern void (*__ledtrig_blkdev_disk_cleanup)(struct gendisk *gd);
+/* Caller must call put_disk() */
+struct gendisk *ledtrig_blkdev_get_disk(const char *const name);
+
#endif /* __LEDTRIG_BLKDEV_H */
--
2.31.1
next prev parent reply other threads:[~2021-09-09 22:25 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-09 22:24 [PATCH v2 00/15] Introduce block device LED trigger Ian Pilcher
2021-09-09 22:24 ` [PATCH v2 01/15] docs: Add block device (blkdev) LED trigger documentation Ian Pilcher
2021-09-09 22:25 ` [PATCH v2 02/15] leds: trigger: blkdev: Add build infrastructure Ian Pilcher
2021-09-10 1:32 ` Marek Behún
2021-09-09 22:25 ` [PATCH v2 03/15] leds: trigger: blkdev: Add functions needed by block changes Ian Pilcher
2021-09-09 22:25 ` [PATCH v2 04/15] block: Add block device LED trigger integrations Ian Pilcher
2021-09-09 23:27 ` Chaitanya Kulkarni
2021-09-10 1:23 ` Marek Behún
2021-09-10 15:00 ` Ian Pilcher
2021-09-10 1:38 ` Marek Behún
2021-09-09 22:25 ` [PATCH v2 05/15] leds: trigger: blkdev: Complete functions called by block subsys Ian Pilcher
2021-09-09 22:25 ` Ian Pilcher [this message]
2021-09-10 6:45 ` [PATCH v2 06/15] leds: trigger: blkdev: Add function to get gendisk by name Greg KH
2021-09-10 15:17 ` Ian Pilcher
2021-09-10 15:23 ` Greg KH
2021-09-10 16:28 ` Ian Pilcher
2021-09-09 22:25 ` [PATCH v2 07/15] leds: trigger: blkdev: Add constants and types Ian Pilcher
2021-09-09 22:25 ` [PATCH v2 08/15] leds: trigger: blkdev: Add stub LED trigger structure Ian Pilcher
2021-09-09 22:25 ` [PATCH v2 09/15] leds: trigger: blkdev: Check devices for activity and blink LEDs Ian Pilcher
2021-09-10 1:48 ` Marek Behún
2021-09-10 2:17 ` Marek Behún
2021-09-10 15:09 ` Ian Pilcher
2021-09-10 15:12 ` Marek Behún
2021-09-10 21:23 ` Ian Pilcher
2021-09-09 22:25 ` [PATCH v2 10/15] leds: trigger: blkdev: Add LED trigger activate function Ian Pilcher
2021-09-10 6:47 ` Greg KH
2021-09-10 16:10 ` Ian Pilcher
2021-09-09 22:25 ` [PATCH v2 11/15] leds: trigger: blkdev: Enable linking block devices to LEDs Ian Pilcher
2021-09-10 6:48 ` Greg KH
2021-09-10 16:25 ` Ian Pilcher
2021-09-09 22:25 ` [PATCH v2 12/15] leds: trigger: blkdev: Enable unlinking block devices from LEDs Ian Pilcher
2021-09-14 9:58 ` Dan Carpenter
2021-09-09 22:25 ` [PATCH v2 13/15] leds: trigger: blkdev: Add LED trigger deactivate function Ian Pilcher
2021-09-09 22:25 ` [PATCH v2 14/15] leds: trigger: blkdev: Add remaining sysfs attributes Ian Pilcher
2021-09-09 22:25 ` [PATCH v2 15/15] leds: trigger: blkdev: Add disk cleanup and init/exit functions Ian Pilcher
2021-09-10 2:09 ` [PATCH v2 00/15] Introduce block device LED trigger Marek Behún
2021-09-10 14:04 ` Ian Pilcher
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