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Drivers: scsi: storvsc: Filter commands based on the storage protocol version

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commit 8caf92d805 upstream.

Going forward it is possible that some of the commands that are not currently
implemented will be implemented on future Windows hosts. Even if they are not
implemented, we are told the host will corrrectly handle unsupported
commands (by returning appropriate return code and sense information).
Make command filtering depend on the host version.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
K. Y. Srinivasan
2014-07-12 09:48:28 -07:00
committed by Greg Kroah-Hartman
parent ce87c6acfc
commit 1f06be182d
1 changed files with 13 additions and 3 deletions
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16
drivers/scsi/storvsc_drv.c
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@@ -1564,9 +1564,19 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
struct vmscsi_request *vm_srb;
struct stor_mem_pools *memp = scmnd->device->hostdata;
if (!storvsc_scsi_cmd_ok(scmnd)) {
scmnd->scsi_done(scmnd);
return 0;
if (vmstor_current_major <= VMSTOR_WIN8_MAJOR) {
/*
* On legacy hosts filter unimplemented commands.
* Future hosts are expected to correctly handle
* unsupported commands. Furthermore, it is
* possible that some of the currently
* unsupported commands maybe supported in
* future versions of the host.
*/
if (!storvsc_scsi_cmd_ok(scmnd)) {
scmnd->scsi_done(scmnd);
return 0;
}
}
request_size = sizeof(struct storvsc_cmd_request);