diff options
| author |   Nicolas Ferre <nicolas.ferre@atmel.com> | 2011-01-12 15:39:10 +0100 |
|---|---|---|
| committer |   Dan Williams <dan.j.williams@intel.com> | 2011-01-14 16:54:44 -0800 |
| commit | dda36f9821321edf65d69da5c0807df7e73d26fc (patch) | |
| tree | 2a629da4c1650c11bb0b1783317fbda0a1799ec6 /drivers | |
| parent | dmaengine: at_hdmac: flags located in first descriptor (diff) | |
| download | linux-dev-dda36f9821321edf65d69da5c0807df7e73d26fc.tar.xz linux-dev-dda36f9821321edf65d69da5c0807df7e73d26fc.zip | |
dmaengine: at_hdmac: fix race while monitoring channel status
We were reading channel status then taking a lock. This lead to a race because
this lock may delay us and then make this channel not idle anymore.
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/dma/at_hdmac.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c index 3938db210834..40f2bf4ae474 100644 --- a/drivers/dma/at_hdmac.c +++ b/drivers/dma/at_hdmac.c @@ -853,11 +853,11 @@ static void atc_issue_pending(struct dma_chan *chan) dev_vdbg(chan2dev(chan), "issue_pending\n"); + spin_lock_bh(&atchan->lock); if (!atc_chan_is_enabled(atchan)) { - spin_lock_bh(&atchan->lock); atc_advance_work(atchan); - spin_unlock_bh(&atchan->lock); } + spin_unlock_bh(&atchan->lock); } /** |