1 files changed, 37 insertions, 4 deletions

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 01ced4c5a61d..3ee5b8c3b5ce 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -3,7 +3,7 @@
  *
  *  Copyright (C) 2003-2004 Russell King, All Rights Reserved.
  *  SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
- *  Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
+ *  Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved.
  *  MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
  *
  * This program is free software; you can redistribute it and/or modify
@@ -295,6 +295,33 @@ void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
 EXPORT_SYMBOL(mmc_set_data_timeout);
 
 /**
+ *      mmc_align_data_size - pads a transfer size to a more optimal value
+ *      @card: the MMC card associated with the data transfer
+ *      @sz: original transfer size
+ *
+ *      Pads the original data size with a number of extra bytes in
+ *      order to avoid controller bugs and/or performance hits
+ *      (e.g. some controllers revert to PIO for certain sizes).
+ *
+ *      Returns the improved size, which might be unmodified.
+ *
+ *      Note that this function is only relevant when issuing a
+ *      single scatter gather entry.
+ */
+unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz)
+{
+        /*
+         * FIXME: We don't have a system for the controller to tell
+         * the core about its problems yet, so for now we just 32-bit
+         * align the size.
+         */
+        sz = ((sz + 3) / 4) * 4;
+
+        return sz;
+}
+EXPORT_SYMBOL(mmc_align_data_size);
+
+/**
  *      __mmc_claim_host - exclusively claim a host
  *      @host: mmc host to claim
  *      @abort: whether or not the operation should be aborted
@@ -638,6 +665,9 @@ void mmc_rescan(struct work_struct *work)
                  */
                 mmc_bus_put(host);
 
+                if (host->ops->get_cd && host->ops->get_cd(host) == 0)
+                        goto out;
+
                 mmc_claim_host(host);
 
                 mmc_power_up(host);
@@ -652,7 +682,7 @@ void mmc_rescan(struct work_struct *work)
                 if (!err) {
                         if (mmc_attach_sdio(host, ocr))
                                 mmc_power_off(host);
-                        return;
+                        goto out;
                 }
 
                 /*
@@ -662,7 +692,7 @@ void mmc_rescan(struct work_struct *work)
                 if (!err) {
                         if (mmc_attach_sd(host, ocr))
                                 mmc_power_off(host);
-                        return;
+                        goto out;
                 }
 
                 /*
@@ -672,7 +702,7 @@ void mmc_rescan(struct work_struct *work)
                 if (!err) {
                         if (mmc_attach_mmc(host, ocr))
                                 mmc_power_off(host);
-                        return;
+                        goto out;
                 }
 
                 mmc_release_host(host);
@@ -683,6 +713,9 @@ void mmc_rescan(struct work_struct *work)
 
                 mmc_bus_put(host);
         }
+out:
+        if (host->caps & MMC_CAP_NEEDS_POLL)
+                mmc_schedule_delayed_work(&host->detect, HZ);
 }
 
 void mmc_start_host(struct mmc_host *host)