4.4-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit a11f6ca9aef989b56cd31ff4ee2af4fb31a172ec ]
__vdc_tx_trigger should only loop on EAGAIN a finite number of times.
See commit adddc32d6fde ("sunvnet: Do not spin in an infinite loop when vio_ldc_send() returns EAGAIN") for detail.
Signed-off-by: Young Xiao YangX92@hotmail.com Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/block/sunvdc.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/block/sunvdc.c b/drivers/block/sunvdc.c index 4b911ed96ea3..31219fb9e7f4 100644 --- a/drivers/block/sunvdc.c +++ b/drivers/block/sunvdc.c @@ -40,6 +40,8 @@ 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 { @@ -419,6 +421,7 @@ 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; @@ -431,6 +434,8 @@ 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)