Re: [PATCH v5 2/5] mmc: block: Support alternative_gpt_sector() operation
From: Christoph Hellwig <hch@infradead.org>
Date: 2021-08-18 05:30:44
Also in:
linux-efi, linux-tegra
On Wed, Aug 18, 2021 at 03:55:44AM +0300, Dmitry Osipenko wrote:
+static int mmc_blk_alternative_gpt_sector(struct block_device *bdev,
+ sector_t *sector)
+{
+ struct mmc_card *card = mmc_bdev_to_card(bdev);
+
+ if (!card)
+ return -ENODEV;
+
+ if (!card->host->ops->alternative_gpt_sector)
+ return -EOPNOTSUPP;
+
+ return card->host->ops->alternative_gpt_sector(card, sector);
+}
++static struct mmc_card *mmc_bdev_to_card(struct block_device *bdev)
+{
+ struct mmc_blk_data *md;
+
+ if (bdev->bd_disk->fops != &mmc_bdops)
+ return NULL;No need for this check bow that it is only called through mmc_bdops.
+ + md = mmc_blk_get(bdev->bd_disk); + if (!md) + return NULL; + + return md->queue.card; +}
This reference seems to never be dropped anywhere.