[PATCH] Fix Xilinx SystemACE driver to handle empty CF slot

[Grant Likely]

Oops, sorry Jens.  I forgot to CC: you on this patch.

g.

On Sat, Feb 28, 2009 at 1:46 PM, Grant Likely <grant.likely at secretlab.ca> wrote:
> From: Grant Likely <grant.likely at secretlab.ca>
>
> The SystemACE driver does not handle an empty CF slot gracefully.  An
> empty CF slot ends up hanging the system.  This patch adds a check for
> the CF state and stops trying to process requests if the slot is empty.
>
> Signed-off-by: Grant Likely <grant.likely at secretlab.ca>
> ---
>
>  drivers/block/xsysace.c |   22 ++++++++++++++++++++++
>  1 files changed, 22 insertions(+), 0 deletions(-)
>
>
> diff --git a/drivers/block/xsysace.c b/drivers/block/xsysace.c
> index 381d686..ec5b8ca 100644
> --- a/drivers/block/xsysace.c
> +++ b/drivers/block/xsysace.c
> @@ -489,6 +489,28 @@ static void ace_fsm_dostate(struct ace_device *ace)
>                ace->fsm_state, ace->id_req_count);
>  #endif
>
> +       /* Verify that there is actually a CF in the slot.  If not, then
> +        * bail out back to the idle state and wake up all the waiters */
> +       status = ace_in32(ace, ACE_STATUS);
> +       if ((status & ACE_STATUS_CFDETECT) == 0) {
> +               ace->fsm_state = ACE_FSM_STATE_IDLE;
> +               ace->media_change = 1;
> +               set_capacity(ace->gd, 0);
> +               dev_info(ace->dev, "No CF in slot\n");
> +
> +               /* Drop all pending requests */
> +               while ((req = elv_next_request(ace->queue)) != NULL)
> +                       end_request(req, 0);
> +
> +               /* Drop back to IDLE state and notify waiters */
> +               ace->fsm_state = ACE_FSM_STATE_IDLE;
> +               ace->id_result = -EIO;
> +               while (ace->id_req_count) {
> +                       complete(&ace->id_completion);
> +                       ace->id_req_count--;
> +               }
> +       }
> +
>        switch (ace->fsm_state) {
>        case ACE_FSM_STATE_IDLE:
>                /* See if there is anything to do */
>
>



-- 
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.