Re: [PATCH] mmc: core: Kill block requests if card is removed

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On 11/10/2011 3:35 AM, Per Forlin wrote:
Hi Adrian,

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 5278ffb..91d7721 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -259,7 +259,7 @@ static void mmc_wait_for_req_done(struct mmc_host *host,

                cmd = mrq->cmd;
-               if (!cmd->error || !cmd->retries)
+               if (!cmd->error || !cmd->retries || mmc_card_gone(host->card))
host->card will be NULL
static void mmc_remove(struct mmc_host *host)

        host->card = NULL;
card is not freed until later.
Please ignore this part. I jumped to conclusions. I had another look
and there can't be any incoming requests when host->card is NULL.
I need to study device_del() further, in order to understand the details.

There can be incoming requests when the host->card is NULL. This happens when we are detecting the card for the first time. That is, in mmc_rescan() we send all the initialization commands with host->card being NULL.

We can do something like this:
#define mmc_card_gone(c) (c && ((c)->state & MMC_STATE_CARD_GONE))


Thanks & Regards,
Sujit Reddy Thumma

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