linux-kernel - Re: Recent and not-so problems with tifm

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Date:	Mon, 12 Feb 2007 16:44:31 -0800 (PST)
From:	Alex Dubov <oakad@...oo.com>
To:	Pierre Ossman <drzeus-mmc@...eus.cx>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Recent and not-so problems with tifm_sd driver


--- Pierre Ossman <drzeus-mmc@...eus.cx> wrote:

> Alex Dubov wrote:
> > I removed that line altogether (it does not really needed as mmc host will not be accessed
> > anymore). The problem is more elaborate. Here, the card fails, mmc_host_remove is called
> without
> > sleep beforehand, and "after remove" message is printed immediately after it. Only then,
> mmc_block
> > remembers to finish its business. If I leave the sleep in place, mmc_block's stuff will get
> > scheduled before the mmc_remove_host and everything will be all right.
> > You may also notice that host is already powered off ("Setting ... power 0" message) and still
> > mmc_block continues to make requests like nothing happened.
> > 
> 
> How did you do the "after remove" detection? Patch?
>
(Power message is printed by ios callback) 
Here's my current (SVN) remove function:

static void tifm_sd_remove(struct tifm_dev *sock)
{
        struct mmc_host *mmc = tifm_get_drvdata(sock);
        struct tifm_sd *host = mmc_priv(mmc);
        unsigned long flags;

        tasklet_kill(&host->finish_tasklet);
        spin_lock_irqsave(&sock->lock, flags);
        host->flags |= EJECT;
        writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
        mmiowb();
        
        if (host->req) {
                writel(TIFM_FIFO_INT_SETALL,
                       sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
                writel(0, sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);
                host->req->cmd->error = MMC_ERR_TIMEOUT;
                if (host->req->stop)
                        host->req->stop->error = MMC_ERR_TIMEOUT;
                tasklet_schedule(&host->finish_tasklet);
        }
        spin_unlock_irqrestore(&sock->lock, flags);
        // temporary hack
        msleep(1000);
        mmc_remove_host(mmc);
        dev_dbg(&sock->dev, "after remove\n");

        /* The meaning of the bit majority in this constant is unknown. */
        writel(0xfff8 & readl(sock->addr + SOCK_CONTROL),
               sock->addr + SOCK_CONTROL);

        mmc_free_host(mmc);
}


 
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