On Thu, Dec 10, 2015 at 04:14:20PM -0800, K. Y. Srinivasan wrote:
> On the interrupt path, we repeatedly establish the pointer to the
> storvsc_device. Fix this.
>
> Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
> Reviewed-by: Long Li <longli@xxxxxxxxxxxxx>
> Tested-by: Alex Ng <alexng@xxxxxxxxxxxxx>
> ---
> drivers/scsi/storvsc_drv.c | 23 ++++++++---------------
> 1 files changed, 8 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
> index 6f18e94..8ba9908 100644
> --- a/drivers/scsi/storvsc_drv.c
> +++ b/drivers/scsi/storvsc_drv.c
> @@ -958,19 +958,16 @@ static void storvsc_handle_error(struct vmscsi_request *vm_srb,
> }
>
>
> -static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request)
> +static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request,
> + struct storvsc_device *stor_dev)
> {
> struct scsi_cmnd *scmnd = cmd_request->cmd;
> - struct hv_host_device *host_dev = shost_priv(scmnd->device->host);
> struct scsi_sense_hdr sense_hdr;
> struct vmscsi_request *vm_srb;
> struct Scsi_Host *host;
> - struct storvsc_device *stor_dev;
> - struct hv_device *dev = host_dev->dev;
> u32 payload_sz = cmd_request->payload_sz;
> void *payload = cmd_request->payload;
>
> - stor_dev = get_in_stor_device(dev);
> host = stor_dev->host;
>
> vm_srb = &cmd_request->vstor_packet.vm_srb;
> @@ -1000,14 +997,13 @@ static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request)
> kfree(payload);
> }
>
> -static void storvsc_on_io_completion(struct hv_device *device,
> +static void storvsc_on_io_completion(struct storvsc_device *stor_device,
> struct vstor_packet *vstor_packet,
> struct storvsc_cmd_request *request)
> {
> - struct storvsc_device *stor_device;
> struct vstor_packet *stor_pkt;
> + struct hv_device *device = stor_device->device;
>
> - stor_device = hv_get_drvdata(device);
> stor_pkt = &request->vstor_packet;
>
> /*
> @@ -1062,7 +1058,7 @@ static void storvsc_on_io_completion(struct hv_device *device,
> stor_pkt->vm_srb.data_transfer_length =
> vstor_packet->vm_srb.data_transfer_length;
>
> - storvsc_command_completion(request);
> + storvsc_command_completion(request, stor_device);
>
> if (atomic_dec_and_test(&stor_device->num_outstanding_req) &&
> stor_device->drain_notify)
> @@ -1071,21 +1067,19 @@ static void storvsc_on_io_completion(struct hv_device *device,
>
> }
>
> -static void storvsc_on_receive(struct hv_device *device,
> +static void storvsc_on_receive(struct storvsc_device *stor_device,
> struct vstor_packet *vstor_packet,
> struct storvsc_cmd_request *request)
> {
> struct storvsc_scan_work *work;
> - struct storvsc_device *stor_device;
>
> switch (vstor_packet->operation) {
> case VSTOR_OPERATION_COMPLETE_IO:
> - storvsc_on_io_completion(device, vstor_packet, request);
> + storvsc_on_io_completion(stor_device, vstor_packet, request);
> break;
>
> case VSTOR_OPERATION_REMOVE_DEVICE:
> case VSTOR_OPERATION_ENUMERATE_BUS:
> - stor_device = get_in_stor_device(device);
> work = kmalloc(sizeof(struct storvsc_scan_work), GFP_ATOMIC);
> if (!work)
> return;
> @@ -1096,7 +1090,6 @@ static void storvsc_on_receive(struct hv_device *device,
> break;
>
> case VSTOR_OPERATION_FCHBA_DATA:
> - stor_device = get_in_stor_device(device);
> cache_wwn(stor_device, vstor_packet);
> fc_host_node_name(stor_device->host) = stor_device->node_name;
> fc_host_port_name(stor_device->host) = stor_device->port_name;
> @@ -1144,7 +1137,7 @@ static void storvsc_on_channel_callback(void *context)
> vmscsi_size_delta));
> complete(&request->wait_event);
> } else {
> - storvsc_on_receive(device,
> + storvsc_on_receive(stor_device,
> (struct vstor_packet *)packet,
> request);
> }
> --
> 1.7.4.1
>
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Reviewed-by: Johannes Thumshirn <jthumshirn@xxxxxxx>
--
Johannes Thumshirn Storage
jthumshirn@xxxxxxx +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Felix Imendörffer, Jane Smithard, Graham Norton
HRB 21284 (AG Nürnberg)
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