check_sync() checks for whether device driver DMA sync sg list entry count equals to map sg list entry count, but in struct dma_buf_ops, there has below interface:
int (*begin_cpu_access_partial)
int (*end_cpu_access_partial)
When vendor implement these interface in dma heap to support dma-buf partial cache sync for performance improvement, in dma_buf_ops of heap, we copy a sgtable from orginal sgtable but with necessary nents, it will less then nents used in map attachment, in the way, the following warning had occurred:
DMA-API: device_xxx: device driver syncs DMA sg list with different entry count [map count=5] [sync count=1]
Call trace:
check_sync+0x6d8/0xb40
debug_dma_sync_sg_for_cpu+0x114/0x16c
dma_sync_sg_for_cpu+0xa0/0xe4
So need change check conditation in check_sync to support dma-buf partial cache sync.
Bug: 236343688
Signed-off-by: Mingyuan Ma <mingyuan.ma@mediatek.com>
Signed-off-by: Yunfei Wang <yf.wang@mediatek.com>
Change-Id: I2f4db3b156e752eeb022927957f77a3fa534a573
(cherry picked from commit d61fe3ad4bab3f4bc040e7ac0c7ec919b50e8a43)
5146690a6c