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SubjectRe: Getting oops with 3.2.10 when removing a SD card
On Wed, Mar 14, 2012 at 04:38:04PM +0100, Francis Moreau wrote:
> Hi,
>
> I'm getting this oops (pretty often) after writing to a SD card and
> removing the card.
>
> Could anyone have a look please ?

Should be fixed by this patch that has been around for a while now.

Dave

--- linux/fs/partitions/check.c~ 2012-02-20 18:32:55.314253719 -0500
+++ linux/fs/partitions/check.c 2012-02-20 18:34:46.509859745 -0500
@@ -539,17 +539,11 @@ static bool disk_unlock_native_capacity(
}
}

-int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
+static int drop_partitions(struct gendisk *disk, struct block_device *bdev)
{
- struct parsed_partitions *state = NULL;
struct disk_part_iter piter;
struct hd_struct *part;
- int p, highest, res;
-rescan:
- if (state && !IS_ERR(state)) {
- kfree(state);
- state = NULL;
- }
+ int res;

if (bdev->bd_part_count)
return -EBUSY;
@@ -562,6 +556,24 @@ rescan:
delete_partition(disk, part->partno);
disk_part_iter_exit(&piter);

+ return 0;
+}
+
+int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
+{
+ struct parsed_partitions *state = NULL;
+ struct hd_struct *part;
+ int p, highest, res;
+rescan:
+ if (state && !IS_ERR(state)) {
+ kfree(state);
+ state = NULL;
+ }
+
+ res = drop_partitions(disk, bdev);
+ if (res)
+ return res;
+
if (disk->fops->revalidate_disk)
disk->fops->revalidate_disk(disk);
check_disk_size_change(disk, bdev);
@@ -665,6 +677,26 @@ rescan:
return 0;
}

+int invalidate_partitions(struct gendisk *disk, struct block_device *bdev)
+{
+ int res;
+
+ if (!bdev->bd_invalidated)
+ return 0;
+
+ res = drop_partitions(disk, bdev);
+ if (res)
+ return res;
+
+ set_capacity(disk, 0);
+ check_disk_size_change(disk, bdev);
+ bdev->bd_invalidated = 0;
+ /* tell userspace that the media / partition table may have changed */
+ kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
+
+ return 0;
+}
+
unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
{
struct address_space *mapping = bdev->bd_inode->i_mapping;
--- linux/include/linux/genhd.h~ 2012-02-20 18:35:02.777802107 -0500
+++ linux/include/linux/genhd.h 2012-02-20 18:35:13.873762792 -0500
@@ -596,6 +596,7 @@ extern char *disk_name (struct gendisk *

extern int disk_expand_part_tbl(struct gendisk *disk, int target);
extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
+extern int invalidate_partitions(struct gendisk *disk, struct block_device *bdev);
extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
int partno, sector_t start,
sector_t len, int flags,
--- linux/fs/block_dev.c~ 2012-02-20 18:35:24.890723757 -0500
+++ linux/fs/block_dev.c 2012-02-20 18:36:25.166510197 -0500
@@ -1159,8 +1159,12 @@ static int __blkdev_get(struct block_dev
* The latter is necessary to prevent ghost
* partitions on a removed medium.
*/
- if (bdev->bd_invalidated && (!ret || ret == -ENOMEDIUM))
- rescan_partitions(disk, bdev);
+ if (bdev->bd_invalidated) {
+ if (!ret)
+ rescan_partitions(disk, bdev);
+ else if (ret == -ENOMEDIUM)
+ invalidate_partitions(disk, bdev);
+ }
if (ret)
goto out_clear;
} else {
@@ -1190,8 +1194,12 @@ static int __blkdev_get(struct block_dev
if (bdev->bd_disk->fops->open)
ret = bdev->bd_disk->fops->open(bdev, mode);
/* the same as first opener case, read comment there */
- if (bdev->bd_invalidated && (!ret || ret == -ENOMEDIUM))
- rescan_partitions(bdev->bd_disk, bdev);
+ if (bdev->bd_invalidated) {
+ if (!ret)
+ rescan_partitions(bdev->bd_disk, bdev);
+ else if (ret == -ENOMEDIUM)
+ invalidate_partitions(bdev->bd_disk, bdev);
+ }
if (ret)
goto out_unlock_bdev;
}

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