From 936d8592654bb97d5706a73c0e2a6339b090f7fb Mon Sep 17 00:00:00 2001 From: Pierre Ossman Date: Sun, 30 Oct 2005 10:15:58 +0000 Subject: [PATCH] [MMC] Use command class to determine read-only status If a card doesn't support the "write block" command class then any attempts to open the device should reflect this by denying write access. Signed-off-by: Pierre Ossman Signed-off-by: Russell King --- drivers/mmc/mmc_block.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/mmc/mmc_block.c b/drivers/mmc/mmc_block.c index fa83f15fdf..9b629856c7 100644 --- a/drivers/mmc/mmc_block.c +++ b/drivers/mmc/mmc_block.c @@ -85,6 +85,12 @@ static void mmc_blk_put(struct mmc_blk_data *md) up(&open_lock); } +static inline int mmc_blk_readonly(struct mmc_card *card) +{ + return mmc_card_readonly(card) || + !(card->csd.cmdclass & CCC_BLOCK_WRITE); +} + static int mmc_blk_open(struct inode *inode, struct file *filp) { struct mmc_blk_data *md; @@ -97,7 +103,7 @@ static int mmc_blk_open(struct inode *inode, struct file *filp) ret = 0; if ((filp->f_mode & FMODE_WRITE) && - mmc_card_readonly(md->queue.card)) + mmc_blk_readonly(md->queue.card)) ret = -EROFS; } @@ -410,7 +416,7 @@ static int mmc_blk_probe(struct mmc_card *card) printk(KERN_INFO "%s: %s %s %dKiB %s\n", md->disk->disk_name, mmc_card_id(card), mmc_card_name(card), (card->csd.capacity << card->csd.read_blkbits) / 1024, - mmc_card_readonly(card)?"(ro)":""); + mmc_blk_readonly(card)?"(ro)":""); mmc_set_drvdata(card, md); add_disk(md->disk); -- 2.39.5