From: Stephen Rothwell <sfr@canb.auug.org.au>
Date: Fri, 27 May 2005 19:52:58 +0000 (-0700)
Subject: [PATCH] ppc64 iSeries: make virtual DVD-RAMs writable again
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9db29258893b08a838e5ecfa4a0933c9c1f2e305;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

[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>
---

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 */