[PATCH] ppc64 iSeries: make virtual DVD-RAMs writable again

It appears that another test has been added in the Uniform CDROM layer that
must be passed before a DVD-RAM is considered writeable.  This patch
implements an emulation of the needed packet command for the viocd driver.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/cdrom/viocd.c b/drivers/cdrom/viocd.c
index fcca26c89bbc..38dd9ffbe8bc 100644
--- a/drivers/cdrom/viocd.c
+++ b/drivers/cdrom/viocd.c
@@ -488,6 +488,20 @@ static int viocd_packet(struct cdrom_device_info *cdi,
                                          & (CDC_DVD_RAM | CDC_RAM)) != 0;
                 }
                 break;
+        case GPCMD_GET_CONFIGURATION:
+                if (cgc->cmd[3] == CDF_RWRT) {
+                        struct rwrt_feature_desc *rfd = (struct rwrt_feature_desc *)(cgc->buffer + sizeof(struct feature_header));
+
+                        if ((buflen >=
+                             (sizeof(struct feature_header) + sizeof(*rfd))) &&
+                            (cdi->ops->capability & ~cdi->mask
+                             & (CDC_DVD_RAM | CDC_RAM))) {
+                                rfd->feature_code = cpu_to_be16(CDF_RWRT);
+                                rfd->curr = 1;
+                                ret = 0;
+                        }
+                }
+                break;
         default:
                 if (cgc->sense) {
                         /* indicate Unknown code */