[MMC] Fail I/O to stopped SD card; avoid dividing by zero

[David Woodhouse]

Commit:     74e21efd27175886b41afdbe26404b0393feb3d6
Parent:     f654a92bbe93efff10e355716cf0120cffaa4380
commit 74e21efd27175886b41afdbe26404b0393feb3d6
Author:     David Woodhouse <dwmw2 at infradead.org>
AuthorDate: Tue Oct 31 22:04:24 2006 +0800
Commit:     David Woodhouse <dwmw2 at infradead.org>
CommitDate: Tue Oct 31 22:04:24 2006 +0800

    [MMC] Fail I/O to stopped SD card; avoid dividing by zero
    
    When we reset an SD host, we set the clock to zero. Dividing the
    required timeout for I/O by zero is not a good thing, and we might
    as well just abort the I/O early since it's not going to work anyway.
    
    Signed-off-by: David Woodhouse <dwmw2 at infradead.org>
---
 drivers/mmc/mmc_block.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/mmc/mmc_block.c b/drivers/mmc/mmc_block.c
index f9027c8..0ea0e92 100644
--- a/drivers/mmc/mmc_block.c
+++ b/drivers/mmc/mmc_block.c
@@ -246,6 +246,11 @@ static int mmc_blk_issue_rq(struct mmc_q
 		brq.stop.arg = 0;
 		brq.stop.flags = MMC_RSP_R1B | MMC_CMD_AC;
 
+		if (mmc_card_sd(card) && !card->host->ios.clock) {
+			printk(KERN_ERR "%s: I/O to stopped card\n",
+			       req->rq_disk->disk_name);
+			goto cmd_err;
+		}
 		mmc_set_data_timeout(&brq.data, card, rq_data_dir(req) != READ);
 
 		/*