patch-2.4.20 linux-2.4.20/drivers/cdrom/cdrom.c

• Lines: 21
• Date: Thu Nov 28 15:53:12 2002
• Orig file: linux-2.4.19/drivers/cdrom/cdrom.c
• Orig date: Fri Aug 2 17:39:43 2002

diff -urN linux-2.4.19/drivers/cdrom/cdrom.c linux-2.4.20/drivers/cdrom/cdrom.c
@@ -1916,6 +1916,7 @@
 {		
 	struct cdrom_device_ops *cdo = cdi->ops;
 	struct cdrom_generic_command cgc;
+	struct request_sense sense;
 	kdev_t dev = cdi->dev;
 	char buffer[32];
 	int ret = 0;
@@ -1951,9 +1952,11 @@
 		cgc.buffer = (char *) kmalloc(blocksize, GFP_KERNEL);
 		if (cgc.buffer == NULL)
 			return -ENOMEM;
+		memset(&sense, 0, sizeof(sense));
+		cgc.sense = &sense;
 		cgc.data_direction = CGC_DATA_READ;
 		ret = cdrom_read_block(cdi, &cgc, lba, 1, format, blocksize);
-		if (ret) {
+		if (ret && sense.sense_key==0x05 && sense.asc==0x20 && sense.ascq==0x00) {
 			/*
 			 * SCSI-II devices are not required to support
 			 * READ_CD, so let's try switching block size