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Drivers: scsi: storvsc: Fix a bug in handling VMBUS protocol version

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Based on the negotiated VMBUS protocol version, we adjust the size of the storage
protocol messages. The two sizes we currently handle are pre-win8 and post-win8.
In WS2012 R2, we are negotiating higher VMBUS protocol version than the win8
version. Make adjustments to correctly handle this.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
K. Y. Srinivasan 2014-07-12 09:48:29 -07:00 committed by Christoph Hellwig
parent 8caf92d805
commit adb6f9e1a8
1 changed files with 10 additions and 7 deletions
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17
drivers/scsi/storvsc_drv.c
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@ -1752,19 +1752,22 @@ static int storvsc_probe(struct hv_device *device,
* set state to properly communicate with the host.
*/
if (vmbus_proto_version == VERSION_WIN8) {
sense_buffer_size = POST_WIN7_STORVSC_SENSE_BUFFER_SIZE;
vmscsi_size_delta = 0;
vmstor_current_major = VMSTOR_WIN8_MAJOR;
vmstor_current_minor = VMSTOR_WIN8_MINOR;
} else {
switch (vmbus_proto_version) {
case VERSION_WS2008:
case VERSION_WIN7:
sense_buffer_size = PRE_WIN8_STORVSC_SENSE_BUFFER_SIZE;
vmscsi_size_delta = sizeof(struct vmscsi_win8_extension);
vmstor_current_major = VMSTOR_WIN7_MAJOR;
vmstor_current_minor = VMSTOR_WIN7_MINOR;
break;
default:
sense_buffer_size = POST_WIN7_STORVSC_SENSE_BUFFER_SIZE;
vmscsi_size_delta = 0;
vmstor_current_major = VMSTOR_WIN8_MAJOR;
vmstor_current_minor = VMSTOR_WIN8_MINOR;
break;
}
if (dev_id->driver_data == SFC_GUID)
scsi_driver.can_queue = (STORVSC_MAX_IO_REQUESTS *
STORVSC_FC_MAX_TARGETS);