Messages in this thread Patch in this message | ![/](/images/icornerl.gif) | | Date | Fri, 22 Aug 2003 19:26:09 -0600 | From | Erik Andersen <> | Subject | [PATCH] Fix cdrom error handling in 2.4 |
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In both 2.4 and in 2.6, error handling for bad cdrom media is wrong. And it is my fault I'm afraid, since I botched an earlier fix for the problem by putting the fix in the wrong spot.
My kids have a "Jumpstart Toddlers" cd they have long since completely killed, which makes a great test disc. Without this fix, the best time projection I can get for completing a dd type sector copy is about 2 years... Most of that is spent thrashing about in kernel space trying to re-read sectors we already know are not correctable.... After the fix, I was able to rip a copy the CD (or rather muddle through it getting lots of EIO errors) in about 15 minutes.
Attached is the fix for 2.4.x, which just moves the MEDIUM_ERROR handler a bit earlier. I have also included a minor error path cleanup from the 2.6.x driver,
-Erik
-- Erik B. Andersen http://codepoet-consulting.com/ --This message was written using 73% post-consumer electrons--
--- linux/drivers/ide/ide-cd.c.orig 2003-08-22 18:48:07.000000000 -0600 +++ linux/drivers/ide/ide-cd.c 2003-08-22 18:49:07.000000000 -0600 @@ -765,6 +765,8 @@ if ((stat & ERR_STAT) != 0) cdrom_queue_request_sense(drive, wait, pc->sense, pc); } else if (blk_fs_request(rq)) { + int do_end_request = 0; + /* Handle errors from READ and WRITE requests. */ if (sense_key == NOT_READY) { @@ -773,7 +775,7 @@ /* Fail the request. */ printk ("%s: tray open\n", drive->name); - cdrom_end_request(drive, 0); + do_end_request = 1; } else if (sense_key == UNIT_ATTENTION) { /* Media change. */ cdrom_saw_media_change (drive); @@ -782,28 +784,31 @@ But be sure to give up if we've retried too many times. */ if (++rq->errors > ERROR_MAX) - cdrom_end_request(drive, 0); + do_end_request = 1; } else if (sense_key == ILLEGAL_REQUEST || sense_key == DATA_PROTECT) { /* No point in retrying after an illegal request or data protect error.*/ ide_dump_status (drive, "command error", stat); - cdrom_end_request(drive, 0); + do_end_request = 1; + } else if (sense_key == MEDIUM_ERROR) { + /* No point in re-trying a zillion times on a bad + * sector... If we got here the error is not correctable */ + ide_dump_status (drive, "media error (bad sector)", stat); + do_end_request = 1; } else if ((err & ~ABRT_ERR) != 0) { /* Go to the default handler for other errors. */ *startstop = DRIVER(drive)->error(drive, "cdrom_decode_status", stat); return 1; - } else if (sense_key == MEDIUM_ERROR) { - /* No point in re-trying a zillion times on a bad - * sector... If we got here the error is not correctable */ - ide_dump_status (drive, "media error (bad sector)", stat); - cdrom_end_request(drive, 0); } else if ((++rq->errors > ERROR_MAX)) { /* We've racked up too many retries. Abort. */ - cdrom_end_request(drive, 0); + do_end_request = 1; } + if (do_end_request) + cdrom_end_request(drive, 0); + /* If we got a CHECK_CONDITION status, queue a request sense command. */ if ((stat & ERR_STAT) != 0) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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