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Message-ID: <1264206192.31827.7.camel@maxim-laptop>
Date: Sat, 23 Jan 2010 02:23:12 +0200
From: Maxim Levitsky <maximlevitsky@...il.com>
To: Artem Bityutskiy <dedekind1@...il.com>
Cc: linux-mtd <linux-mtd@...ts.infradead.org>,
linux-kernel <linux-kernel@...r.kernel.org>,
Alex Dubov <oakad@...oo.com>, joern <joern@...fs.org>,
Thomas Gleixner <tglx@...utronix.de>,
David Woodhouse <dwmw2@...radead.org>
Subject: [PATCH 3/8] blktrans: don't free mtd_blktrans_dev, core will do
that for you
>>From 926e8cf37572691246011945e3266ca140319b41 Mon Sep 17 00:00:00 2001
From: Maxim Levitsky <maximlevitsky@...il.com>
Date: Sat, 23 Jan 2010 02:04:32 +0200
Subject: [PATCH 3/8] blktrans: don't free mtd_blktrans_dev, core will do that for you
We need that structure till last user exits, and that might be years after
mtd device disappered.
Signed-off-by: Maxim Levitsky <maximlevitsky@...il.com>
---
drivers/mtd/ftl.c | 1 -
drivers/mtd/inftlcore.c | 1 -
drivers/mtd/mtd_blkdevs.c | 16 +++++++++++++++-
drivers/mtd/mtdblock.c | 1 -
drivers/mtd/mtdblock_ro.c | 1 -
drivers/mtd/nftlcore.c | 1 -
drivers/mtd/rfd_ftl.c | 1 -
drivers/mtd/ssfdc.c | 1 -
include/linux/mtd/blktrans.h | 1 +
9 files changed, 16 insertions(+), 8 deletions(-)
diff --git a/drivers/mtd/ftl.c b/drivers/mtd/ftl.c
index e56d6b4..62da9eb 100644
--- a/drivers/mtd/ftl.c
+++ b/drivers/mtd/ftl.c
@@ -1082,7 +1082,6 @@ static void ftl_remove_dev(struct mtd_blktrans_dev *dev)
{
del_mtd_blktrans_dev(dev);
ftl_freepart((partition_t *)dev);
- kfree(dev);
}
static struct mtd_blktrans_ops ftl_tr = {
diff --git a/drivers/mtd/inftlcore.c b/drivers/mtd/inftlcore.c
index 8aca552..015a7fe 100755
--- a/drivers/mtd/inftlcore.c
+++ b/drivers/mtd/inftlcore.c
@@ -139,7 +139,6 @@ static void inftl_remove_dev(struct mtd_blktrans_dev *dev)
kfree(inftl->PUtable);
kfree(inftl->VUtable);
- kfree(inftl);
}
/*
diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index c2d97a0..c95e1ff 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -129,7 +129,11 @@ static int blktrans_open(struct block_device *bdev, fmode_t mode)
goto out;
if (dev->open++)
- goto out;
+ goto out;
+
+ if (dev->deleted)
+ goto out;
+
if (!try_module_get(tr->owner))
goto out_tr;
@@ -169,6 +173,14 @@ static int blktrans_release(struct gendisk *disk, fmode_t mode)
module_put(tr->owner);
}
+ /* Free the private data */
+ if (dev->deleted) {
+ module_put(tr->owner);
+ mutex_unlock(&dev->lock);
+ kfree(dev);
+ return 0;
+ }
+
return ret;
}
@@ -338,6 +350,8 @@ int del_mtd_blktrans_dev(struct mtd_blktrans_dev *old)
/* stop new requests to arrive */
del_gendisk(old->disk);
+ old->deleted = 1;
+
/* Stop the thread */
kthread_stop(old->thread);
diff --git a/drivers/mtd/mtdblock.c b/drivers/mtd/mtdblock.c
index 9f41b1a..d8322cc 100644
--- a/drivers/mtd/mtdblock.c
+++ b/drivers/mtd/mtdblock.c
@@ -368,7 +368,6 @@ static void mtdblock_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd)
static void mtdblock_remove_dev(struct mtd_blktrans_dev *dev)
{
del_mtd_blktrans_dev(dev);
- kfree(dev);
}
static struct mtd_blktrans_ops mtdblock_tr = {
diff --git a/drivers/mtd/mtdblock_ro.c b/drivers/mtd/mtdblock_ro.c
index 852165f..54ff288 100644
--- a/drivers/mtd/mtdblock_ro.c
+++ b/drivers/mtd/mtdblock_ro.c
@@ -49,7 +49,6 @@ static void mtdblock_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd)
static void mtdblock_remove_dev(struct mtd_blktrans_dev *dev)
{
del_mtd_blktrans_dev(dev);
- kfree(dev);
}
static struct mtd_blktrans_ops mtdblock_tr = {
diff --git a/drivers/mtd/nftlcore.c b/drivers/mtd/nftlcore.c
index 1002e18..a4578bf 100644
--- a/drivers/mtd/nftlcore.c
+++ b/drivers/mtd/nftlcore.c
@@ -126,7 +126,6 @@ static void nftl_remove_dev(struct mtd_blktrans_dev *dev)
del_mtd_blktrans_dev(dev);
kfree(nftl->ReplUnitTable);
kfree(nftl->EUNtable);
- kfree(nftl);
}
/*
diff --git a/drivers/mtd/rfd_ftl.c b/drivers/mtd/rfd_ftl.c
index d2aa9c4..63b83c0 100644
--- a/drivers/mtd/rfd_ftl.c
+++ b/drivers/mtd/rfd_ftl.c
@@ -817,7 +817,6 @@ static void rfd_ftl_remove_dev(struct mtd_blktrans_dev *dev)
vfree(part->sector_map);
kfree(part->header_cache);
kfree(part->blocks);
- kfree(part);
}
static struct mtd_blktrans_ops rfd_ftl_tr = {
diff --git a/drivers/mtd/ssfdc.c b/drivers/mtd/ssfdc.c
index 3f67e00..81c4ecd 100644
--- a/drivers/mtd/ssfdc.c
+++ b/drivers/mtd/ssfdc.c
@@ -375,7 +375,6 @@ static void ssfdcr_remove_dev(struct mtd_blktrans_dev *dev)
del_mtd_blktrans_dev(dev);
kfree(ssfdc->logic_block_map);
- kfree(ssfdc);
}
static int ssfdcr_readsect(struct mtd_blktrans_dev *dev,
diff --git a/include/linux/mtd/blktrans.h b/include/linux/mtd/blktrans.h
index 507f7b2..e276aca 100644
--- a/include/linux/mtd/blktrans.h
+++ b/include/linux/mtd/blktrans.h
@@ -24,6 +24,7 @@ struct mtd_blktrans_dev {
int devnum;
unsigned long size;
int readonly;
+ int deleted;
int open;
struct gendisk *disk;
struct task_struct *thread;
--
1.6.3.3
--
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