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Revert "Revert "mmc: block: Issue a cache flush only when it's enabled""

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This reverts commit 36c1596556.

Bring back the commit in 5.10.36 that broke the kabi.

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Id4a80652b7b702c620626606fdbdd6565584e27c
This commit is contained in:
Greg Kroah-Hartman 2021-05-13 14:25:51 +02:00 • committed by Todd Kjos
commit 51dc321c7d
4 changed files with 21 additions and 3 deletions
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4
drivers/mmc/core/block.c
View file

@ -2236,6 +2236,10 @@ enum mmc_issued mmc_blk_mq_issue_rq(struct mmc_queue *mq, struct request *req)
case MMC_ISSUE_ASYNC:
switch (req_op(req)) {
case REQ_OP_FLUSH:
if (!mmc_cache_enabled(host)) {
blk_mq_end_request(req, BLK_STS_OK);
return MMC_REQ_FINISHED;
}
ret = mmc_blk_cqe_issue_flush(mq, req);
break;
case REQ_OP_READ:

9
drivers/mmc/core/core.h
View file

@ -29,6 +29,7 @@ struct mmc_bus_ops {
int (*shutdown)(struct mmc_host *);
int (*hw_reset)(struct mmc_host *);
int (*sw_reset)(struct mmc_host *);
bool (*cache_enabled)(struct mmc_host *);
};
void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops);
@ -163,4 +164,12 @@ static inline void mmc_post_req(struct mmc_host *host, struct mmc_request *mrq,
host->ops->post_req(host, mrq, err);
}
static inline bool mmc_cache_enabled(struct mmc_host *host)
{
if (host->bus_ops->cache_enabled)
return host->bus_ops->cache_enabled(host);
return false;
}
#endif

7
drivers/mmc/core/mmc.c
View file

@ -2033,6 +2033,12 @@ static void mmc_detect(struct mmc_host *host)
}
}
static bool _mmc_cache_enabled(struct mmc_host *host)
{
return host->card->ext_csd.cache_size > 0 &&
host->card->ext_csd.cache_ctrl & 1;
}
static int _mmc_suspend(struct mmc_host *host, bool is_suspend)
{
int err = 0;
@ -2212,6 +2218,7 @@ static const struct mmc_bus_ops mmc_ops = {
.alive = mmc_alive,
.shutdown = mmc_shutdown,
.hw_reset = _mmc_hw_reset,
.cache_enabled = _mmc_cache_enabled,
};
/*

4
drivers/mmc/core/mmc_ops.c
View file

@ -988,9 +988,7 @@ int mmc_flush_cache(struct mmc_card *card)
{
int err = 0;
if (mmc_card_mmc(card) &&
(card->ext_csd.cache_size > 0) &&
(card->ext_csd.cache_ctrl & 1)) {
if (mmc_cache_enabled(card->host)) {
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_FLUSH_CACHE, 1,
MMC_CACHE_FLUSH_TIMEOUT_MS);