omap_hsmmc: ensure workqueues are empty before suspend

Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com>
Acked-by: Matt Fleming <matt@console-pimps.org>
Cc: Ian Molton <ian@mnementh.co.uk>
Cc: "Roberto A. Foglietta" <roberto.foglietta@gmail.com>
Cc: Jarkko Lavinen <jarkko.lavinen@nokia.com>
Cc: Denis Karpov <ext-denis.2.karpov@nokia.com>
Cc: Pierre Ossman <pierre@ossman.eu>
Cc: Philip Langdale <philipl@overt.org>
Cc: "Madhusudhan" <madhu.cr@ti.com>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 59f0010..9599dd1 100644 (file)
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -151,7 +151,6 @@ struct mmc_omap_host {
        u32                     bytesleft;
        int                     suspended;
        int                     irq;
-       int                     carddetect;
        int                     use_dma, dma_ch;
        int                     dma_line_tx, dma_line_rx;
        int                     slot_id;
@@ -761,14 +760,19 @@ static void mmc_omap_detect(struct work_struct *work)
        struct mmc_omap_host *host = container_of(work, struct mmc_omap_host,
                                                mmc_carddetect_work);
        struct omap_mmc_slot_data *slot = &mmc_slot(host);
+       int carddetect;
+
+       if (host->suspended)
+               return;
+
+       sysfs_notify(&host->mmc->class_dev.kobj, NULL, "cover_switch");
 
        if (mmc_slot(host).card_detect)
-               host->carddetect = slot->card_detect(slot->card_detect_irq);
+               carddetect = slot->card_detect(slot->card_detect_irq);
        else
-               host->carddetect = -ENOSYS;
+               carddetect = -ENOSYS;
 
-       sysfs_notify(&host->mmc->class_dev.kobj, NULL, "cover_switch");
-       if (host->carddetect) {
+       if (carddetect) {
                mmc_detect_change(host->mmc, (HZ * 200) / 1000);
        } else {
                mmc_host_enable(host->mmc);
@@ -785,6 +789,8 @@ static irqreturn_t omap_mmc_cd_handler(int irq, void *dev_id)
 {
        struct mmc_omap_host *host = (struct mmc_omap_host *)dev_id;
 
+       if (host->suspended)
+               return IRQ_HANDLED;
        schedule_work(&host->mmc_carddetect_work);
 
        return IRQ_HANDLED;
@@ -1524,30 +1530,42 @@ static int omap_mmc_suspend(struct platform_device *pdev, pm_message_t state)
                return 0;
 
        if (host) {
+               host->suspended = 1;
+               if (host->pdata->suspend) {
+                       ret = host->pdata->suspend(&pdev->dev,
+                                                       host->slot_id);
+                       if (ret) {
+                               dev_dbg(mmc_dev(host->mmc),
+                                       "Unable to handle MMC board"
+                                       " level suspend\n");
+                               host->suspended = 0;
+                               return ret;
+                       }
+               }
+               cancel_work_sync(&host->mmc_carddetect_work);
                mmc_host_enable(host->mmc);
                ret = mmc_suspend_host(host->mmc, state);
                if (ret == 0) {
-                       host->suspended = 1;
-
                        OMAP_HSMMC_WRITE(host->base, ISE, 0);
                        OMAP_HSMMC_WRITE(host->base, IE, 0);
 
-                       if (host->pdata->suspend) {
-                               ret = host->pdata->suspend(&pdev->dev,
-                                                               host->slot_id);
-                               if (ret)
-                                       dev_dbg(mmc_dev(host->mmc),
-                                               "Unable to handle MMC board"
-                                               " level suspend\n");
-                       }
 
                        OMAP_HSMMC_WRITE(host->base, HCTL,
                                         OMAP_HSMMC_READ(host->base, HCTL) & ~SDBP);
                        mmc_host_disable(host->mmc);
                        clk_disable(host->iclk);
                        clk_disable(host->dbclk);
-               } else
+               } else {
+                       host->suspended = 0;
+                       if (host->pdata->resume) {
+                               ret = host->pdata->resume(&pdev->dev,
+                                                         host->slot_id);
+                               if (ret)
+                                       dev_dbg(mmc_dev(host->mmc),
+                                               "Unmask interrupt failed\n");
+                       }
                        mmc_host_disable(host->mmc);
+               }
 
        }
        return ret;