[PATCH 5.10 474/491] mmc: core: Drop superfluous validations in mmc_hw|sw_reset()

Greg Kroah-Hartman
2026-04-13T17:03:08Z

From: Ulf Hansson <ulf.hansson@linaro.org>

[ Upstream commit fefdd3c91e0a7b3cbb3f25925d93a57c45cb0f31 ]

The mmc_hw|sw_reset() APIs are designed to be called solely from upper
layers, which means drivers that operates on top of the struct mmc_card,
like the mmc block device driver and an SDIO functional driver.

Additionally, as long as the struct mmc_host has a valid pointer to a
struct mmc_card, the corresponding host->bus_ops pointer stays valid and
assigned.

For these reasons, let's drop the superfluous reference counting and the
redundant validations in mmc_hw|sw_reset().

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20210212131532.236775-1-ulf.hansson@linaro.org
Stable-dep-of: 901084c51a0a ("mmc: core: Avoid bitfield RMW for claim/retune flags")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/mmc/core/block.c | 2 +-
drivers/mmc/core/core.c | 21 +--------------------
2 files changed, 2 insertions(+), 21 deletions(-)

--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -987,7 +987,7 @@ static int mmc_blk_reset(struct mmc_blk_
md->reset_done |= type;
err = mmc_hw_reset(host);
/* Ensure we switch back to the correct partition */
- if (err != -EOPNOTSUPP) {
+ if (err) {
struct mmc_blk_data *main_md =
dev_get_drvdata(&host->card->dev);
int part_err;
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -2096,18 +2096,7 @@ int mmc_hw_reset(struct mmc_host *host)
{
int ret;

- if (!host->card)
- return -EINVAL;
-
- mmc_bus_get(host);
- if (!host->bus_ops || host->bus_dead || !host->bus_ops->hw_reset) {
- mmc_bus_put(host);
- return -EOPNOTSUPP;
- }
-
ret = host->bus_ops->hw_reset(host);
- mmc_bus_put(host);
-
if (ret < 0)
pr_warn("%s: tried to HW reset card, got error %d\n",
mmc_hostname(host), ret);
@@ -2120,18 +2109,10 @@ int mmc_sw_reset(struct mmc_host *host)
{
int ret;

- if (!host->card)
- return -EINVAL;
-
- mmc_bus_get(host);
- if (!host->bus_ops || host->bus_dead || !host->bus_ops->sw_reset) {
- mmc_bus_put(host);
+ if (!host->bus_ops->sw_reset)
return -EOPNOTSUPP;
- }

ret = host->bus_ops->sw_reset(host);
- mmc_bus_put(host);
-
if (ret)
pr_warn("%s: tried to SW reset card, got error %d\n",
mmc_hostname(host), ret);