From 396bbe1427828be1025fb052b7e04b42f421352d Mon Sep 17 00:00:00 2001

From: =?UTF-8?q?Diego=20Elio=20Petten=C3=B2?= <flameeyes@flameeyes.com>

Date: Tue, 19 Nov 2019 21:37:09 +0000

Subject: [PATCH] sr_vendor: support Beurer GL50 evo CD-on-a-chip devices.

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References: boo#1164632

Patch-mainline: v5.5-rc1

Git-commit: 396bbe1427828be1025fb052b7e04b42f421352d

The Beurer GL50 evo uses a Cygnal-manufactured CD-on-a-chip that only

accepts a subset of SCSI commands, and supports neither audio commands

nor generic packet commands.

Actually sending those commands bring the device to an unrecoverable

state that causes the device to hang and reset.

To: Jens Axboe <axboe@kernel.dk>

Cc: linux-kernel@vger.kernel.org

Cc: linux-scsi@vger.kernel.org

Signed-off-by: Diego Elio Pettenò <flameeyes@flameeyes.com>

Signed-off-by: Jens Axboe <axboe@kernel.dk>

Acked-by: Michal Suchanek <msuchanek@suse.de>

---

 drivers/scsi/sr_vendor.c | 18 ++++++++++++++++++

 1 file changed, 18 insertions(+)

diff --git a/drivers/scsi/sr_vendor.c b/drivers/scsi/sr_vendor.c

index e3b0ce25162b..17a56c87d383 100644

--- a/drivers/scsi/sr_vendor.c

+++ b/drivers/scsi/sr_vendor.c

@@ -61,6 +61,7 @@

 #define VENDOR_NEC             2

 #define VENDOR_TOSHIBA         3

 #define VENDOR_WRITER          4	/* pre-scsi3 writers */

+#define VENDOR_CYGNAL_85ED     5	/* CD-on-a-chip */

 #define VENDOR_TIMEOUT	30*HZ

@@ -99,6 +100,23 @@ void sr_vendor_init(Scsi_CD *cd)

 	} else if (!strncmp(vendor, "TOSHIBA", 7)) {

 		cd->vendor = VENDOR_TOSHIBA;

+	} else if (!strncmp(vendor, "Beurer", 6) &&

+		   !strncmp(model, "Gluco Memory", 12)) {

+		/* The Beurer GL50 evo uses a Cygnal-manufactured CD-on-a-chip

+		   that only accepts a subset of SCSI commands.  Most of the

+		   not-implemented commands are fine to fail, but a few,

+		   particularly around the MMC or Audio commands, will put the

+		   device into an unrecoverable state, so they need to be

+		   avoided at all costs.

+		*/

+		cd->vendor = VENDOR_CYGNAL_85ED;

+		cd->cdi.mask |= (

+			CDC_MULTI_SESSION |

+			CDC_CLOSE_TRAY | CDC_OPEN_TRAY |

+			CDC_LOCK |

+			CDC_GENERIC_PACKET |

+			CDC_PLAY_AUDIO

+			);

 	}

 #endif

 }

-- 

2.23.0