From 15520111500c33a012aeec28ece8c5f2dcbf6b5e Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Mon, 19 Dec 2016 15:57:34 +0200 Subject: [PATCH] mmc: core: Further fix thread wake-up Commit e0097cf5f2f1 ("mmc: queue: Fix queue thread wake-up") did not go far enough. mmc_wait_for_data_req_done() still contains some problems and can be further simplified. First it should not touch context_info->is_waiting_last_req because that is a wake-up control used by the owner of the context. Secondly, it should always return when one of its wake-up conditions is met because, again, that is contolled by the owner of the context. While the current block driver does not have an issue, these problems were exposed during testing of the Software Command Queue patches. Fixes: e0097cf5f2f1 ("mmc: queue: Fix queue thread wake-up") Signed-off-by: Adrian Hunter Tested-by: Harjani Ritesh Signed-off-by: Ulf Hansson --- drivers/mmc/core/core.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index 543eadd230e5..1076b9d89df3 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -496,8 +496,7 @@ static int __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq) * Returns enum mmc_blk_status after checking errors. */ static enum mmc_blk_status mmc_wait_for_data_req_done(struct mmc_host *host, - struct mmc_request *mrq, - struct mmc_async_req *next_req) + struct mmc_request *mrq) { struct mmc_command *cmd; struct mmc_context_info *context_info = &host->context_info; @@ -507,7 +506,7 @@ static enum mmc_blk_status mmc_wait_for_data_req_done(struct mmc_host *host, wait_event_interruptible(context_info->wait, (context_info->is_done_rcv || context_info->is_new_req)); - context_info->is_waiting_last_req = false; + if (context_info->is_done_rcv) { context_info->is_done_rcv = false; cmd = mrq->cmd; @@ -527,10 +526,9 @@ static enum mmc_blk_status mmc_wait_for_data_req_done(struct mmc_host *host, __mmc_start_request(host, mrq); continue; /* wait for done/new event again */ } - } else if (context_info->is_new_req) { - if (!next_req) - return MMC_BLK_NEW_REQUEST; } + + return MMC_BLK_NEW_REQUEST; } mmc_retune_release(host); return status; @@ -660,7 +658,7 @@ struct mmc_async_req *mmc_start_req(struct mmc_host *host, mmc_pre_req(host, areq->mrq); if (host->areq) { - status = mmc_wait_for_data_req_done(host, host->areq->mrq, areq); + status = mmc_wait_for_data_req_done(host, host->areq->mrq); if (status == MMC_BLK_NEW_REQUEST) { if (ret_stat) *ret_stat = status; -- 2.30.2