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| author | Young Xiao <YangX92@hotmail.com> | 2018-11-28 12:36:39 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-02-12 19:47:03 +0100 |
| commit | 3fbba4e55051d01a72b56ea192064175924bf56a (patch) | |
| tree | 4ad5c867cae622eb5355ba545b138ded44af5511 | |
| parent | d65fbc4fe9a9688ad2e63c92befe2be5e66c9b5b (diff) | |
| download | linux-rt-3fbba4e55051d01a72b56ea192064175924bf56a.tar.gz | |
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 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>
| -rw-r--r-- | drivers/block/sunvdc.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/block/sunvdc.c b/drivers/block/sunvdc.c index f68e9baffad7..5d7024057540 100644 --- a/drivers/block/sunvdc.c +++ b/drivers/block/sunvdc.c @@ -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) |