From: zhangtianyang <zhangtianyang@loongson.cn> LoongArch inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/ICOFL4 CVE: NA -------------------------------- There is no guarantee of sequence between DMA and interrupts on the Loongson platform. Signed-off-by: songwenge <songwenge@loongson.cn> Signed-off-by: zhangtianyang <zhangtianyang@loongson.cn> Signed-off-by: Hongchen Zhang <zhanghongchen@loongson.cn> --- drivers/nvme/host/pci.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 07ed1f5087bb..80d30cf83a96 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -10,6 +10,9 @@ #include <linux/blk-mq.h> #include <linux/blk-mq-pci.h> #include <linux/blk-integrity.h> +#ifdef CONFIG_LOONGARCH +#include <linux/delay.h> +#endif #include <linux/dmi.h> #include <linux/init.h> #include <linux/interrupt.h> @@ -1079,6 +1082,14 @@ static irqreturn_t nvme_irq(int irq, void *data) struct nvme_queue *nvmeq = data; DEFINE_IO_COMP_BATCH(iob); +#ifdef CONFIG_LOONGARCH + /* + * There is no guarantee of sequence between DMA + * and interrupts on the Loongson platform. + */ + udelay(30); +#endif + if (nvme_poll_cq(nvmeq, &iob)) { if (!rq_list_empty(iob.req_list)) nvme_pci_complete_batch(&iob); -- 2.33.0