diff options
| author |   Sinan Kaya <okaya@codeaurora.org> | 2016-10-21 12:37:56 -0400 |
|---|---|---|
| committer |   Vinod Koul <vinod.koul@intel.com> | 2016-11-03 18:55:44 +0530 |
| commit | bdcfddfd7481d7756edfeb30fc28b550f6c64812 (patch) | |
| tree | 25799f85346a01ee8b106a7ae39008db67af6f63 /drivers/dma/qcom/hidma.h | |
| parent | dmaengine: qcom_hidma: break completion processing on error (diff) | |
| download | linux-dev-bdcfddfd7481d7756edfeb30fc28b550f6c64812.tar.xz linux-dev-bdcfddfd7481d7756edfeb30fc28b550f6c64812.zip | |
dmaengine: qcom_hidma: make pending_tre_count atomic
Getting ready for the MSI interrupts. The pending_tre_count is used
in the interrupt handler to make sure all outstanding requests are
serviced.
The driver will allocate 11 MSI interrupts. Each MSI interrupt can be
assigned to a different CPU. Then, we have a race condition for common
variables as they share the same interrupt handler with a different
cause bit and they can potentially be executed in parallel. Making this
variable atomic so that it can be updated from multiple processor
contexts.
Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/qcom/hidma.h')
| -rw-r--r-- | drivers/dma/qcom/hidma.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/dma/qcom/hidma.h b/drivers/dma/qcom/hidma.h index de6176497524..181f7e0d08f6 100644 --- a/drivers/dma/qcom/hidma.h +++ b/drivers/dma/qcom/hidma.h @@ -59,7 +59,7 @@ struct hidma_lldev { void __iomem *evca; /* Event Channel address */ struct hidma_tre **pending_tre_list; /* Pointers to pending TREs */ - s32 pending_tre_count; /* Number of TREs pending */ + atomic_t pending_tre_count; /* Number of TREs pending */ void *tre_ring; /* TRE ring */ dma_addr_t tre_dma; /* TRE ring to be shared with HW */ |