shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-03 17:51:57 +09:00
Code Issues Packages Projects Releases Wiki Activity

dmaengine: imx-dma: fix callback path in tasklet

Browse Source 
commit fcaaba6c71 upstream.

We need to free the ld_active list head before jumping into the callback
routine. Otherwise the callback could run into issue_pending and change
our ld_active list head we just going to free. This will run the channel
list into an currupted and undefined state.

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Cc: Jonghwan Choi <jhbird.choi@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Michael Grzeschik
2013-09-17 15:56:08 +02:00
committed by Greg Kroah-Hartman
parent 16c72f379e
commit 8dac1d1548
1 changed files with 6 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/dma/imx-dma.c
View File

@@ -604,13 +604,11 @@ static void imxdma_tasklet(unsigned long data)
if (list_empty(&imxdmac->ld_active)) {
/* Someone might have called terminate all */
goto out;
spin_unlock_irqrestore(&imxdma->lock, flags);
return;
}
desc = list_first_entry(&imxdmac->ld_active, struct imxdma_desc, node);
if (desc->desc.callback)
desc->desc.callback(desc->desc.callback_param);
/* If we are dealing with a cyclic descriptor, keep it on ld_active
* and dont mark the descriptor as complete.
* Only in non-cyclic cases it would be marked as complete
@@ -638,6 +636,10 @@ static void imxdma_tasklet(unsigned long data)
}
out:
spin_unlock_irqrestore(&imxdma->lock, flags);
if (desc->desc.callback)
desc->desc.callback(desc->desc.callback_param);
}
static int imxdma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,