diff options
| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2015-06-25 19:12:11 +0300 |
|---|---|---|
| committer | James Bottomley <JBottomley@Odin.com> | 2015-08-13 01:55:59 +0300 |
| commit | cb1cf0804fe582f8a626c3cc591cb3127536137c (patch) | |
| tree | 2e9add2e90a00a512c97c262b628d2a74c0a0ee5 /drivers/scsi | |
| parent | 10978e48ccc1718dce5c2d275b761ab99c593a81 (diff) | |
| download | linux-cb1cf0804fe582f8a626c3cc591cb3127536137c.tar.xz | |
storvsc: be more picky about scmnd->sc_data_direction
Under the 'default' case in scmnd->sc_data_direction we have 3 options:
- DMA_NONE which we handle correctly.
- DMA_BIDIRECTIONAL which is never supposed to be set by SCSI stack.
- Garbage value.
Do WARN() and return -EINVAL in the last two cases. virtio_scsi does
BUG_ON() here but it looks like an overkill.
Reported-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Acked-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/storvsc_drv.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c index 3c6584ff65c1..61f485532543 100644 --- a/drivers/scsi/storvsc_drv.c +++ b/drivers/scsi/storvsc_drv.c @@ -1598,10 +1598,18 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) vm_srb->data_in = READ_TYPE; vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN; break; - default: + case DMA_NONE: vm_srb->data_in = UNKNOWN_TYPE; vm_srb->win8_extension.srb_flags |= SRB_FLAGS_NO_DATA_TRANSFER; break; + default: + /* + * This is DMA_BIDIRECTIONAL or something else we are never + * supposed to see here. + */ + WARN(1, "Unexpected data direction: %d\n", + scmnd->sc_data_direction); + return -EINVAL; } |