Hi Ohad,
On Sun, Nov 28, 2010 at 07:21:28AM +0200, Ohad Ben-Cohen wrote:
> mmc_rescan checks whether registered cards are still present before
> skipping them, by calling the bus-specific ->detect() handler.
>
> With buses that support runtime PM, the card may be powered off at
> this point, so they need to be powered on and fully reinitialized before
> ->detect() executes.
>
> This whole process is redundant with nonremovable cards; in those cases,
> we can safely skip calling ->detect() and implicitly assume its success.
>
> Signed-off-by: Ohad Ben-Cohen <[email protected]>
> ---
> drivers/mmc/core/core.c | 8 ++++++--
> 1 files changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
> index 6286898..e8332d7 100644
> --- a/drivers/mmc/core/core.c
> +++ b/drivers/mmc/core/core.c
> @@ -1506,8 +1506,12 @@ void mmc_rescan(struct work_struct *work)
>
> mmc_bus_get(host);
>
> - /* if there is a card registered, check whether it is still present */
> - if ((host->bus_ops != NULL) && host->bus_ops->detect && !host->bus_dead)
> + /*
> + * if there is a _removable_ card registered, check whether it is
> + * still present
> + */
> + if ((host->bus_ops != NULL) && host->bus_ops->detect && !host->bus_dead
> + && mmc_card_is_removable(host))
> host->bus_ops->detect(host);
>
> mmc_bus_put(host);
Thanks, pushed to mmc-next with trivial cleanup as below:
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index e7c0c78..d9c98ee 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -1506,8 +1506,12 @@ void mmc_rescan(struct work_struct *work)
mmc_bus_get(host);
- /* if there is a card registered, check whether it is still present */
- if ((host->bus_ops != NULL) && host->bus_ops->detect && !host->bus_dead)
+ /*
+ * if there is a _removable_ card registered, check whether it is
+ * still present
+ */
+ if (host->bus_ops && host->bus_ops->detect && !host->bus_dead
+ && mmc_card_is_removable(host))
host->bus_ops->detect(host);
mmc_bus_put(host);
--
Chris Ball <[email protected]> <http://printf.net/>
One Laptop Per Child
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