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[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 <drzeus@drzeus.cx>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Pierre Ossman 2005-10-30 10:15:58 +00:00 committed by Russell King
parent 9e1d98c5d8
commit 936d859265
1 changed files with 8 additions and 2 deletions
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10
drivers/mmc/mmc_block.c
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@ -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);