[PATCH 1/2] mmc: block: Issue flush only if allowed
From: Avri Altman <avri.altman@wdc.com>
Date: 2021-03-22 13:38:37
Also in:
lkml
Subsystem:
multimedia card (mmc), secure digital (sd) and sdio subsystem, the rest · Maintainers:
Ulf Hansson, Linus Torvalds
The cache may be flushed to the nonvolatile storage by writing to FLUSH_CACHE byte (EXT_CSD byte [32]). When in command queueing mode, the cache may be flushed by issuing a CMDQ_TASK_ DEV_MGMT (CMD48) with a FLUSH_CACHE op-code. Either way, verify that The cache function is turned ON before doing so. fixes: 1e8e55b67030 (mmc: block: Add CQE support) Reported-by: Brendan Peter <redacted> Tested-by: Brendan Peter <redacted> Signed-off-by: Avri Altman <avri.altman@wdc.com> --- drivers/mmc/core/block.c | 3 +++ drivers/mmc/core/mmc_ops.c | 4 +--- drivers/mmc/core/mmc_ops.h | 5 +++++ 3 files changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index 42e27a298218..a93c66aa91db 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c@@ -1473,6 +1473,9 @@ static int mmc_blk_cqe_issue_flush(struct mmc_queue *mq, struct request *req) struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); struct mmc_request *mrq = mmc_blk_cqe_prep_dcmd(mqrq, req); + if (mmc_card_mmc(mq->card) && !mmc_flush_allowed(mq->card)) + return 0; + mrq->cmd->opcode = MMC_SWITCH; mrq->cmd->arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) | (EXT_CSD_FLUSH_CACHE << 16) |
diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
index baa6314f69b4..b8a0c9ac8a20 100644
--- a/drivers/mmc/core/mmc_ops.c
+++ b/drivers/mmc/core/mmc_ops.c@@ -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_card_mmc(card) && mmc_flush_allowed(card)) { err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_FLUSH_CACHE, 1, MMC_CACHE_FLUSH_TIMEOUT_MS);
diff --git a/drivers/mmc/core/mmc_ops.h b/drivers/mmc/core/mmc_ops.h
index 632009260e51..bf2b315addd7 100644
--- a/drivers/mmc/core/mmc_ops.h
+++ b/drivers/mmc/core/mmc_ops.h@@ -19,6 +19,11 @@ enum mmc_busy_cmd { struct mmc_host; struct mmc_card; +static inline bool mmc_flush_allowed(struct mmc_card *card) +{ + return card->ext_csd.cache_size > 0 && (card->ext_csd.cache_ctrl & 1); +} + int mmc_select_card(struct mmc_card *card); int mmc_deselect_cards(struct mmc_host *host); int mmc_set_dsr(struct mmc_host *host);
--
2.25.1