| 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: <20081220062849.GA14770@gollum.tnic>
Date: Sat, 20 Dec 2008 07:28:49 +0100
From: Borislav Petkov <petkovbb@...glemail.com>
To: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc: linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: [PATCH 0/8] ide-cd: first conversion batch
Hi,
On Fri, Dec 19, 2008 at 09:15:40PM +0100, Bartlomiej Zolnierkiewicz wrote:
[.. ]
> Yes, we don't want to move them over. In worst case we can add
> ide_handler_t *__old_pc_handler to ide_drive_t and set it in ide-cd
> (an acceptable hack this time) but there might be better options.
Ok, here's the final patch moving ide-cd to the services of
ide_(issue|transfer)_pc. The only change in functionality is that we
don't do cdrom_decode_status for DRQ_INTERRUPT devices but this is
probably not that relevant anymore since we busy-wait for DRQ to get set
through ide_wait_stat, as we talked about it before - it being a bugfix for
all atapi devices. If there's still interest for that (and I think it
could be of use to have an all-atapi function ide_decode_status() that
dumps error messages if DRQ doesn't get set based on the sense_key) I'll
add cook something up.
--
From: Borislav Petkov <petkovbb@...il.com>
Date: Sat, 20 Dec 2008 07:06:48 +0100
Subject: [PATCH 9/9] ide-cd: convert to ide-atapi facilities
... and remove no longer needed cdrom_start_packet_command and
cdrom_transfer_packet_command.
Tested lightly with ide-cd and ide-floppy.
Signed-off-by: Borislav Petkov <petkovbb@...il.com>
---
drivers/ide/ide-atapi.c | 6 ++-
drivers/ide/ide-cd.c | 102 +----------------------------------------------
include/linux/ide.h | 2 +
3 files changed, 9 insertions(+), 101 deletions(-)
diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index 5b92e0a..0e96da5 100644
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -550,7 +550,10 @@ static ide_startstop_t ide_transfer_pc(ide_drive_t *drive)
}
/* Set the interrupt routine */
- ide_set_handler(drive, ide_pc_intr, timeout, expiry);
+ ide_set_handler(drive,
+ (dev_is_idecd(drive) ? drive->irq_handler
+ : ide_pc_intr),
+ timeout, expiry);
/* Begin DMA, if necessary */
if (dev_is_idecd(drive)) {
@@ -580,6 +583,7 @@ ide_startstop_t ide_issue_pc(ide_drive_t *drive)
u16 bcount;
if (dev_is_idecd(drive)) {
+
tf_flags = IDE_TFLAG_OUT_NSECT | IDE_TFLAG_OUT_LBAL;
bcount = ide_cd_get_xferlen(hwif->hwgroup->rq);
expiry = ide_cd_expiry;
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index f3c7cc3..b6087a2 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -511,105 +511,6 @@ end_request:
return 1;
}
-static ide_startstop_t cdrom_newpc_intr(ide_drive_t *);
-
-/*
- * Send a packet command to DRIVE described by CMD_BUF and CMD_LEN. The device
- * registers must have already been prepared by cdrom_start_packet_command.
- * HANDLER is the interrupt handler to call when the command completes or
- * there's data ready.
- */
-#define ATAPI_MIN_CDB_BYTES 12
-static ide_startstop_t cdrom_transfer_packet_command(ide_drive_t *drive)
-{
- ide_hwif_t *hwif = drive->hwif;
- struct request *rq = hwif->hwgroup->rq;
- int cmd_len;
- ide_startstop_t startstop;
-
- ide_debug_log(IDE_DBG_PC, "Call %s\n", __func__);
-
- if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
- /*
- * Here we should have been called after receiving an interrupt
- * from the device. DRQ should how be set.
- */
-
- /* check for errors */
- if (cdrom_decode_status(drive, ATA_DRQ, NULL))
- return ide_stopped;
-
- /* ok, next interrupt will be DMA interrupt */
- if (drive->dma)
- drive->waiting_for_dma = 1;
- } else {
- /* otherwise, we must wait for DRQ to get set */
- if (ide_wait_stat(&startstop, drive, ATA_DRQ,
- ATA_BUSY, WAIT_READY))
- return startstop;
- }
-
- /* arm the interrupt handler */
- ide_set_handler(drive, cdrom_newpc_intr, rq->timeout, ide_cd_expiry);
-
- /* ATAPI commands get padded out to 12 bytes minimum */
- cmd_len = COMMAND_SIZE(rq->cmd[0]);
- if (cmd_len < ATAPI_MIN_CDB_BYTES)
- cmd_len = ATAPI_MIN_CDB_BYTES;
-
- /* send the command to the device */
- hwif->tp_ops->output_data(drive, NULL, rq->cmd, cmd_len);
-
- /* start the DMA if need be */
- if (drive->dma)
- hwif->dma_ops->dma_start(drive);
-
- return ide_started;
-}
-
-/*
- * Set up the device registers for transferring a packet command on DEV,
- * expecting to later transfer XFERLEN bytes. HANDLER is the routine
- * which actually transfers the command to the drive. If this is a
- * drq_interrupt device, this routine will arrange for HANDLER to be
- * called when the interrupt from the drive arrives. Otherwise, HANDLER
- * will be called immediately after the drive is prepared for the transfer.
- */
-static ide_startstop_t cdrom_start_packet_command(ide_drive_t *drive)
-{
- ide_hwif_t *hwif = drive->hwif;
- struct request *rq = hwif->hwgroup->rq;
- int xferlen;
-
- xferlen = ide_cd_get_xferlen(rq);
-
- ide_debug_log(IDE_DBG_PC, "Call %s, xferlen: %d\n", __func__, xferlen);
-
- /* FIXME: for Virtual DMA we must check harder */
- if (drive->dma)
- drive->dma = !hwif->dma_ops->dma_setup(drive);
-
- /* set up the controller registers */
- ide_pktcmd_tf_load(drive, IDE_TFLAG_OUT_NSECT | IDE_TFLAG_OUT_LBAL,
- xferlen, drive->dma);
-
- if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
- /* waiting for CDB interrupt, not DMA yet. */
- if (drive->dma)
- drive->waiting_for_dma = 0;
-
- /* packet command */
- ide_execute_command(drive, ATA_CMD_PACKET,
- cdrom_transfer_packet_command,
- ATAPI_WAIT_PC, ide_cd_expiry);
- return ide_started;
- } else {
- ide_execute_pkt_cmd(drive);
-
- return cdrom_transfer_packet_command(drive);
- }
-}
-
/*
* Check the contents of the interrupt reason register from the cdrom
* and attempt to recover if there are problems. Returns 0 if everything's
@@ -1185,7 +1086,7 @@ static ide_startstop_t ide_cd_do_request(ide_drive_t *drive, struct request *rq,
return ide_stopped;
}
- return cdrom_start_packet_command(drive);
+ return ide_issue_pc(drive);
}
/*
@@ -2084,6 +1985,7 @@ static int ide_cd_probe(ide_drive_t *drive)
}
drive->debug_mask = debug_mask;
+ drive->irq_handler = cdrom_newpc_intr;
info = kzalloc(sizeof(struct cdrom_info), GFP_KERNEL);
if (info == NULL) {
diff --git a/include/linux/ide.h b/include/linux/ide.h
index db5ef8a..2fa5539 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -662,6 +662,8 @@ struct ide_drive_s {
int (*pc_io_buffers)(struct ide_drive_s *, struct ide_atapi_pc *,
unsigned int, int);
+ ide_startstop_t (*irq_handler)(struct ide_drive_s *);
+
unsigned long atapi_flags;
struct ide_atapi_pc request_sense_pc;
--
1.6.0.4
--
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