| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <20090216092501.GA24323@gollum.tnic>
Date: Mon, 16 Feb 2009 10:25:01 +0100
From: Borislav Petkov <petkovbb@...glemail.com>
To: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc: linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 11/20] ide-cd: unify cdrom_newpc_intr() exit paths
On Mon, Feb 16, 2009 at 01:14:22AM +0100, Bartlomiej Zolnierkiewicz wrote:
> From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
> Subject: [PATCH] ide-cd: unify cdrom_newpc_intr() exit paths
>
> * Move cdrom_end_request() calls from cdrom_decode_status()
> and ide_cd_check_ireason() to cdrom_newpc_intr().
>
> * Unify cdrom_newpc_intr() exit paths.
>
> There should be no functional changes caused by this patch.
>
> Cc: Borislav Petkov <petkovbb@...il.com>
> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
> ---
> drivers/ide/ide-cd.c | 48 +++++++++++++++++++++++-------------------------
> 1 file changed, 23 insertions(+), 25 deletions(-)
>
> Index: b/drivers/ide/ide-cd.c
> ===================================================================
> --- a/drivers/ide/ide-cd.c
> +++ b/drivers/ide/ide-cd.c
> @@ -291,7 +291,8 @@ static void cdrom_end_request(ide_drive_
> /*
> * Returns:
> * 0: if the request should be continued.
> - * 1: if the request was ended.
> + * 1: if the request will be going through error recovery.
> + * 2: if the request should be ended.
Yeah, we need defines for those. Especially if they're checked in other
functions:
if (rc == 2)
is simply not ok :). Rather,
if (rc == DO_END_REQUEST)
or something like that is much better, imho.
> */
> static int cdrom_decode_status(ide_drive_t *drive, int good_stat, int *stat_ret)
> {
> @@ -324,10 +325,7 @@ static int cdrom_decode_status(ide_drive
> * Just give up.
> */
> rq->cmd_flags |= REQ_FAILED;
> - cdrom_end_request(drive, 0);
> - ide_error(drive, "request sense failure", stat);
> - return 1;
> -
> + return 2;
> } else if (blk_pc_request(rq) || rq->cmd_type == REQ_TYPE_ATA_PC) {
> /* All other functions, except for READ. */
>
> @@ -467,14 +465,12 @@ static int cdrom_decode_status(ide_drive
> */
> if (stat & ATA_ERR)
> cdrom_queue_request_sense(drive, NULL, NULL);
> + return 1;
> } else {
> blk_dump_rq_flags(rq, PFX "bad rq");
> - cdrom_end_request(drive, 0);
> + return 2;
> }
>
> - /* retry, or handle the next request */
> - return 1;
> -
> end_request:
> if (stat & ATA_ERR) {
> struct request_queue *q = drive->queue;
> @@ -487,10 +483,9 @@ end_request:
> hwif->rq = NULL;
>
> cdrom_queue_request_sense(drive, rq->sense, rq);
> + return 1;
> } else
> - cdrom_end_request(drive, 0);
> -
> - return 1;
> + return 2;
> }
>
> /*
> @@ -534,7 +529,6 @@ static int ide_cd_check_ireason(ide_driv
> if (rq->cmd_type == REQ_TYPE_ATA_PC)
> rq->cmd_flags |= REQ_FAILED;
>
> - cdrom_end_request(drive, 0);
> return -1;
> }
>
> @@ -736,7 +730,8 @@ static ide_startstop_t cdrom_newpc_intr(
> xfer_func_t *xferfunc;
> ide_expiry_t *expiry = NULL;
> int dma_error = 0, dma, stat, thislen, uptodate = 0;
> - int write = (rq_data_dir(rq) == WRITE) ? 1 : 0;
> + int write = (rq_data_dir(rq) == WRITE) ? 1 : 0, rc;
> + int sense = blk_sense_request(rq);
> unsigned int timeout;
> u16 len;
> u8 ireason;
> @@ -756,8 +751,12 @@ static ide_startstop_t cdrom_newpc_intr(
> }
> }
>
> - if (cdrom_decode_status(drive, 0, &stat))
> + rc = cdrom_decode_status(drive, 0, &stat);
> + if (rc) {
> + if (rc == 2)
> + goto out_end;
> return ide_stopped;
> + }
>
> /* using dma, transfer is complete now */
> if (dma) {
> @@ -802,8 +801,6 @@ static ide_startstop_t cdrom_newpc_intr(
> rq->cmd_flags |= REQ_FAILED;
> uptodate = 0;
> }
> - cdrom_end_request(drive, uptodate);
> - return ide_stopped;
> } else if (!blk_pc_request(rq)) {
> ide_cd_request_sense_fixup(drive, rq);
> /* complain if we still have data left to transfer */
> @@ -815,17 +812,16 @@ static ide_startstop_t cdrom_newpc_intr(
> }
>
> /* check which way to transfer data */
> - if (ide_cd_check_ireason(drive, rq, len, ireason, write))
> - return ide_stopped;
> + rc = ide_cd_check_ireason(drive, rq, len, ireason, write);
> + if (rc)
> + goto out_end;
>
> if (blk_fs_request(rq)) {
> if (write == 0) {
> int nskip;
>
> - if (ide_cd_check_transfer_size(drive, len)) {
> - cdrom_end_request(drive, 0);
> - return ide_stopped;
> - }
> + if (ide_cd_check_transfer_size(drive, len))
> + goto out_end;
>
> /*
> * First, figure out if we need to bit-bucket
> @@ -918,7 +914,7 @@ static ide_startstop_t cdrom_newpc_intr(
> else
> rq->data += blen;
> }
> - if (!write && blk_sense_request(rq))
> + if (sense && write == 0)
> rq->sense_len += blen;
> }
>
> @@ -939,7 +935,7 @@ static ide_startstop_t cdrom_newpc_intr(
> return ide_started;
>
> out_end:
> - if (blk_pc_request(rq)) {
> + if (blk_pc_request(rq) && rc == 0) {
> unsigned int dlen = rq->data_len;
>
> if (dma)
> @@ -951,6 +947,8 @@ out_end:
> hwif->rq = NULL;
> } else {
> cdrom_end_request(drive, uptodate);
> + if (sense && rc == 2)
> + ide_error(drive, "request sense failure", stat);
> }
> return ide_stopped;
> }
--
Regards/Gruss,
Boris.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists