Commit 56f6911c authored by Shawn Lin's avatar Shawn Lin Committed by Ulf Hansson

mmc: dw_mmc: check card present before starting request

The main reason to add this check is to avoid unnecessary
mmc_request like the on-going cmd and the corresponding sbc
if the card is removed. Although we have already checked this in
dw_mci_handle_cd for runtime usage of sd card and dw_mci_init_slot
for noremovable devices, but there is a timing gap before it really
calls dw_mci_get_cd as mmc_detect_change needs some delay here.

Another gain here is that we could save some checkings of card status
after sd card been removed.
Signed-off-by: default avatarShawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: default avatarJaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent c0834a58
......@@ -105,6 +105,7 @@ struct idmac_desc {
static bool dw_mci_reset(struct dw_mci *host);
static bool dw_mci_ctrl_reset(struct dw_mci *host, u32 reset);
static int dw_mci_card_busy(struct mmc_host *mmc);
static int dw_mci_get_cd(struct mmc_host *mmc);
#if defined(CONFIG_DEBUG_FS)
static int dw_mci_req_show(struct seq_file *s, void *v)
......@@ -1253,15 +1254,15 @@ static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
* atomic, otherwise the card could be removed in between and the
* request wouldn't fail until another card was inserted.
*/
spin_lock_bh(&host->lock);
if (!test_bit(DW_MMC_CARD_PRESENT, &slot->flags)) {
spin_unlock_bh(&host->lock);
if (!dw_mci_get_cd(mmc)) {
mrq->cmd->error = -ENOMEDIUM;
mmc_request_done(mmc, mrq);
return;
}
spin_lock_bh(&host->lock);
dw_mci_queue_request(host, slot, mrq);
spin_unlock_bh(&host->lock);
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment