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authorThomas Gleixner <[email protected]>2014-07-16 21:57:38 +0200
committerThomas Gleixner <[email protected]>2014-07-16 21:57:38 +0200
commitafdb094380889222583df9ef803587f6b8a82c8d (patch)
tree4a03c516568e5c8b994a5739f3d34f4552c78898 /drivers/dma/cppi41.c
parentbe11e6d86081aa6328eaa4fe6dd14ccf39a023c8 (diff)
parent1795cd9b3a91d4b5473c97f491d63892442212ab (diff)
Merge tag 'v3.16-rc5' into timers/core
Reason: Bring in upstream modifications, so the pending changes which depend on them can be queued.
Diffstat (limited to 'drivers/dma/cppi41.c')
-rw-r--r--drivers/dma/cppi41.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/dma/cppi41.c b/drivers/dma/cppi41.c
index d028f36ae655..8f8b0b608875 100644
--- a/drivers/dma/cppi41.c
+++ b/drivers/dma/cppi41.c
@@ -86,6 +86,9 @@
#define USBSS_IRQ_PD_COMP (1 << 2)
+/* Packet Descriptor */
+#define PD2_ZERO_LENGTH (1 << 19)
+
struct cppi41_channel {
struct dma_chan chan;
struct dma_async_tx_descriptor txd;
@@ -307,7 +310,7 @@ static irqreturn_t cppi41_irq(int irq, void *data)
__iormb();
while (val) {
- u32 desc;
+ u32 desc, len;
q_num = __fls(val);
val &= ~(1 << q_num);
@@ -319,9 +322,13 @@ static irqreturn_t cppi41_irq(int irq, void *data)
q_num, desc);
continue;
}
- c->residue = pd_trans_len(c->desc->pd6) -
- pd_trans_len(c->desc->pd0);
+ if (c->desc->pd2 & PD2_ZERO_LENGTH)
+ len = 0;
+ else
+ len = pd_trans_len(c->desc->pd0);
+
+ c->residue = pd_trans_len(c->desc->pd6) - len;
dma_cookie_complete(&c->txd);
c->txd.callback(c->txd.callback_param);
}