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Message-ID: <5680F5F9.9020207@intel.com>
Date: Mon, 28 Dec 2015 10:42:33 +0200
From: Adrian Hunter <adrian.hunter@...el.com>
To: Nicholas Krause <xerofoify@...il.com>, ulf.hansson@...aro.org
Cc: tomas.winkler@...el.com, tklauser@...tanz.ch, sholi@...dia.com,
kuninori.morimoto.gx@...esas.com, lporzio@...ron.com,
chuanxiao.dong@...el.com, jonathanh@...dia.com,
grundler@...omium.org, linux-mmc@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND] mmc:Fix error handling in the function
mmc_blk_issue_rq
On 26/12/15 22:10, Nicholas Krause wrote:
> This fixes error handling in the function mmc_blk_issue_rq for
> checking if the calls to the function mmc_blk_issue_rw_rq have
> failed by returning zero as there return value and if so jump
> immediately to the goto label out for cleanup of resources used
> and allocated by the function mmc_blk_issue_rq before returning
> this return value to the caller of this particular function to
> indicate to the caller that it's call(s) have failed.
Are you experiencing a problem with the existing code, because it looks more
correct to me?
There does seem to be a gap in the way MMC_QUEUE_NEW_REQUEST is handled,
since the code is expecting that mmc_blk_issue_rw_rq() will have done
waiting for any ongoing request, but it is not clear it will have if
MMC_QUEUE_NEW_REQUEST is possible. But that is a different issue.
>
> Signed-off-by: Nicholas Krause <xerofoify@...il.com>
> ---
> drivers/mmc/card/block.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
> index a1b820f..354a151 100644
> --- a/drivers/mmc/card/block.c
> +++ b/drivers/mmc/card/block.c
> @@ -2055,7 +2055,9 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
> if (cmd_flags & REQ_DISCARD) {
> /* complete ongoing async transfer before issuing discard */
> if (card->host->areq)
> - mmc_blk_issue_rw_rq(mq, NULL);
> + ret = mmc_blk_issue_rw_rq(mq, NULL);
> + if (!ret)
> + goto out;
> if (req->cmd_flags & REQ_SECURE)
> ret = mmc_blk_issue_secdiscard_rq(mq, req);
> else
> @@ -2063,7 +2065,9 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
> } else if (cmd_flags & REQ_FLUSH) {
> /* complete ongoing async transfer before issuing flush */
> if (card->host->areq)
> - mmc_blk_issue_rw_rq(mq, NULL);
> + ret = mmc_blk_issue_rw_rq(mq, NULL);
> + if (!ret)
> + goto out;
> ret = mmc_blk_issue_flush(mq, req);
> } else {
> if (!req && host->areq) {
>
--
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