linux-kernel - [PATCH v3 3/8] mtd: ubi: block: don't return on error when removing

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Date:   Tue, 8 Aug 2023 17:04:09 +0100
From:   Daniel Golle <daniel@...rotopia.org>
To:     Randy Dunlap <rdunlap@...radead.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Daniel Golle <daniel@...rotopia.org>,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 3/8] mtd: ubi: block: don't return on error when removing

There is no point on returning the error from ubiblock_remove in case
it is being called due to a volume removal event -- the volume is gone,
we should destroy and remove the ubiblock device no matter what.

Introduce new boolean parameter 'force' to tell ubiblock_remove to go
on even in case the ubiblock device is still busy. Use that new option
when calling ubiblock_remove due to a UBI_VOLUME_REMOVED event.

Signed-off-by: Daniel Golle <daniel@...rotopia.org>
---
 drivers/mtd/ubi/block.c | 6 +++---
 drivers/mtd/ubi/cdev.c  | 2 +-
 drivers/mtd/ubi/ubi.h   | 4 ++--
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/mtd/ubi/block.c b/drivers/mtd/ubi/block.c
index 437c5b83ffe51..69fa6fecb8494 100644
--- a/drivers/mtd/ubi/block.c
+++ b/drivers/mtd/ubi/block.c
@@ -456,7 +456,7 @@ static void ubiblock_cleanup(struct ubiblock *dev)
 	idr_remove(&ubiblock_minor_idr, dev->gd->first_minor);
 }
 
-int ubiblock_remove(struct ubi_volume_info *vi)
+int ubiblock_remove(struct ubi_volume_info *vi, bool force)
 {
 	struct ubiblock *dev;
 	int ret;
@@ -470,7 +470,7 @@ int ubiblock_remove(struct ubi_volume_info *vi)
 
 	/* Found a device, let's lock it so we can check if it's busy */
 	mutex_lock(&dev->dev_mutex);
-	if (dev->refcnt > 0) {
+	if (dev->refcnt > 0 && !force) {
 		ret = -EBUSY;
 		goto out_unlock_dev;
 	}
@@ -545,7 +545,7 @@ static int ubiblock_notify(struct notifier_block *nb,
 		 */
 		break;
 	case UBI_VOLUME_REMOVED:
-		ubiblock_remove(&nt->vi);
+		ubiblock_remove(&nt->vi, true);
 		break;
 	case UBI_VOLUME_RESIZED:
 		ubiblock_resize(&nt->vi);
diff --git a/drivers/mtd/ubi/cdev.c b/drivers/mtd/ubi/cdev.c
index f43430b9c1e65..bb55e863dd296 100644
--- a/drivers/mtd/ubi/cdev.c
+++ b/drivers/mtd/ubi/cdev.c
@@ -572,7 +572,7 @@ static long vol_cdev_ioctl(struct file *file, unsigned int cmd,
 		struct ubi_volume_info vi;
 
 		ubi_get_volume_info(desc, &vi);
-		err = ubiblock_remove(&vi);
+		err = ubiblock_remove(&vi, false);
 		break;
 	}
 
diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h
index c8f1bd4fa1008..44c0eeaf1e1b0 100644
--- a/drivers/mtd/ubi/ubi.h
+++ b/drivers/mtd/ubi/ubi.h
@@ -979,7 +979,7 @@ static inline void ubi_fastmap_destroy_checkmap(struct ubi_volume *vol) {}
 int ubiblock_init(void);
 void ubiblock_exit(void);
 int ubiblock_create(struct ubi_volume_info *vi);
-int ubiblock_remove(struct ubi_volume_info *vi);
+int ubiblock_remove(struct ubi_volume_info *vi, bool force);
 #else
 static inline int ubiblock_init(void) { return 0; }
 static inline void ubiblock_exit(void) {}
@@ -987,7 +987,7 @@ static inline int ubiblock_create(struct ubi_volume_info *vi)
 {
 	return -ENOSYS;
 }
-static inline int ubiblock_remove(struct ubi_volume_info *vi)
+static inline int ubiblock_remove(struct ubi_volume_info *vi, bool force)
 {
 	return -ENOSYS;
 }
-- 
2.41.0