[PATCH]mmc: core: not to --qty when calculate timeout for SECURE_ERASE

[Chuanxiao Dong <chuanxiao.dong@xxxxxxxxx>]

--qty when calculating erase timeout for trim/erase & secure trim/erase
can prevent the erase range crossing qty+1 erase groups, which made
the final timeout value is too large for the host.

When operate SECURE_ERASE, driver needs the erase range is aligned with
erase size, otherwise do nothing and return an error. That is to say
it is not necessary for SECURE_ERASE to --qty since it will never cross
an erase group.

Signed-off-by: Chuanxiao Dong <chuanxiao.dong@xxxxxxxxx>
---
 drivers/mmc/core/core.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index e541efb..b5a393a 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -1761,7 +1761,7 @@ static unsigned int mmc_do_calc_max_discard(struct mmc_card *card,
 	if (!qty)
 		return 0;
 
-	if (qty == 1)
+	if (qty == 1 && arg != MMC_SECURE_ERASE_ARG)
 		return 1;
 
 	/* Convert qty to sectors */
@@ -1772,6 +1772,13 @@ static unsigned int mmc_do_calc_max_discard(struct mmc_card *card,
 	else
 		max_discard = --qty * card->erase_size;
 
+	/*
+	 * since SECURE_ERASE is erase group aligned, otherwise
+	 * it cannot be erased in secure purpose, needn't --qty
+	 */
+	if (arg == MMC_SECURE_ERASE_ARG)
+		max_discard += card->erase_size;
+
 	return max_discard;
 }
 
-- 
1.7.1

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