mmc:fix a bug when max_discard is 0

The original purpose of the code I fix is to replace max_discard with
max_trim if max_trim is less than max_discard. When max_discard is 0
we should replace max_discard with max_trim as well, because
max_discard equals 0 happens only when the max_do_calc_max_discard
process is overflowed, so if mmc_can_trim(card) is true, max_discard
should be replaced by an available max_trim.
However, in the original code, there are two lines of code interfere
the right process.
1) if (max_discard && mmc_can_trim(card))
when max_discard is 0, it skips the process checking if max_discard
needs to be replaced with max_trim.
2) if (max_trim < max_discard)
the condition is false when max_discard is 0. it also skips the process
that replaces max_discard with max_trim, in fact, we should replace the
0-valued max_discard with max_trim.

Signed-off-by: Jiong Wu <Lohengrin1024@gmail.com>
Fixes: b305882fbc87 (mmc: core: optimize mmc_calc_max_discard)
Cc: stable@vger.kernel.org # v4.17+
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index ebf1a08..6db36dc 100644 (file)
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -2071,9 +2071,9 @@ unsigned int mmc_calc_max_discard(struct mmc_card *card)
                return card->pref_erase;
 
        max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG);
-       if (max_discard && mmc_can_trim(card)) {
+       if (mmc_can_trim(card)) {
                max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG);
-               if (max_trim < max_discard)
+               if (max_trim < max_discard || max_discard == 0)
                        max_discard = max_trim;
        } else if (max_discard < card->erase_size) {
                max_discard = 0;