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Commit a11f6ca9 authored by Young Xiao's avatar Young Xiao Committed by Jens Axboe
Browse files

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



__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: default avatarYoung Xiao <YangX92@hotmail.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 5f0ed774

drivers/block/sunvdc.c

+5 −0
Original line number Diff line number Diff line
@@ -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)