提交 3fbba4e5 编写于 作者: Y Young Xiao 提交者: Greg Kroah-Hartman

sunvdc: Do not spin in an infinite loop when vio_ldc_send() returns EAGAIN

[ Upstream commit a11f6ca9aef989b56cd31ff4ee2af4fb31a172ec ]

__vdc_tx_trigger should only loop on EAGAIN a finite
number of times.

See commit adddc32d ("sunvnet: Do not spin in an
infinite loop when vio_ldc_send() returns EAGAIN") for detail.
Signed-off-by: NYoung Xiao <YangX92@hotmail.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>
Signed-off-by: NSasha Levin <sashal@kernel.org>
上级 d65fbc4f
......@@ -45,6 +45,8 @@ MODULE_VERSION(DRV_MODULE_VERSION);
#define WAITING_FOR_GEN_CMD 0x04
#define WAITING_FOR_ANY -1
#define VDC_MAX_RETRIES 10
static struct workqueue_struct *sunvdc_wq;
struct vdc_req_entry {
......@@ -431,6 +433,7 @@ static int __vdc_tx_trigger(struct vdc_port *port)
.end_idx = dr->prod,
};
int err, delay;
int retries = 0;
hdr.seq = dr->snd_nxt;
delay = 1;
......@@ -443,6 +446,8 @@ static int __vdc_tx_trigger(struct vdc_port *port)
udelay(delay);
if ((delay <<= 1) > 128)
delay = 128;
if (retries++ > VDC_MAX_RETRIES)
break;
} while (err == -EAGAIN);
if (err == -ENOTCONN)
......
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