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Message-ID: <20080115201032.GB5699@gollum.tnic>
Date: Tue, 15 Jan 2008 21:10:32 +0100
From: Borislav Petkov <bbpetkov@...oo.de>
To: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc: linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: [PATCH 10/12] ide-floppy: remove atomic test_*bit macros
On Mon, Jan 14, 2008 at 10:50:58PM +0100, Bartlomiej Zolnierkiewicz wrote:
> On Sunday 13 January 2008, Borislav Petkov wrote:
> > ..and replace them with flag enums.
> >
> > Signed-off-by: Borislav Petkov <bbpetkov@...oo.de>
> > ---
> > drivers/ide/ide-floppy.c | 132 +++++++++++++++++++++++++--------------------
> > 1 files changed, 73 insertions(+), 59 deletions(-)
>
> [...]
>
> > @@ -506,14 +516,14 @@ static ide_startstop_t idefloppy_pc_intr(ide_drive_t *drive)
> >
> > debug_log("Reached %s interrupt handler\n", __FUNCTION__);
> >
> > - if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags)) {
> > + if (PC_FLAG_DMA_IN_PROGRESS & pc->flags) {
>
> the usual kernel convention is to put flag last, i.e.
>
> pc->flags & PC_FLAG_DMA_IN_PROGRESS
>
> [...]
>
> > @@ -570,7 +581,7 @@ static ide_startstop_t idefloppy_pc_intr(ide_drive_t *drive)
> > printk(KERN_ERR "ide-floppy: CoD != 0 in %s\n", __FUNCTION__);
> > return ide_do_reset(drive);
> > }
> > - if (((ireason & IO) == IO) == test_bit(PC_WRITING, &pc->flags)) {
> > + if (((ireason & IO) == IO) == (PC_FLAG_WRITING & pc->flags)) {
>
> - test_bit() returns 1 or 0 (=> boolean)
> - (pc->flags & PC_FLAG_WRITING) is 0x10 or 0
>
> so the above comparison will fail
>
> > @@ -607,7 +618,7 @@ static ide_startstop_t idefloppy_pc_intr(ide_drive_t *drive)
> > xferfunc(drive, pc->current_position, bcount);
> > else
> > ide_floppy_io_buffers(drive, pc, bcount,
> > - test_bit(PC_WRITING, &pc->flags));
> > + (PC_FLAG_WRITING & pc->flags));
>
> ditto, this may actually work but '(pc->flags & PC_FLAG_WRITING) ? 1 : 0'
> would be much safer from maintainability POV
>
> [...]
>
> > @@ -1720,13 +1731,16 @@ static int idefloppy_media_changed(struct gendisk *disk)
> > {
> > struct ide_floppy_obj *floppy = ide_floppy_g(disk);
> > ide_drive_t *drive = floppy->drive;
> > + int ret;
> >
> > /* do not scan partitions twice if this is a removable device */
> > if (drive->attach) {
> > drive->attach = 0;
> > return 0;
> > }
> > - return test_and_clear_bit(IDEFLOPPY_MEDIA_CHANGED, &floppy->flags);
> > + ret = IDEFLOPPY_FLAG_MEDIA_CHANGED & floppy->flags;
> > + floppy->flags &= ~IDEFLOPPY_FLAG_MEDIA_CHANGED;
> > + return ret;
> > }
>
> same issue
>
> otherwise looks good, please fix/resubmit
> (together with patch #12)
.. this is the second one...
From: Borislav Petkov <bbpetkov@...oo.de>
Date: Tue, 15 Jan 2008 20:49:18 +0100
Subject: [PATCH 16/18] ide-floppy: remove atomic test_*bit macros
..and replace them with flag enums.
Signed-off-by: Borislav Petkov <bbpetkov@...oo.de>
:100644 100644 8e9063f... 8a4791d... M drivers/ide/ide-floppy.c
diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
index 8e9063f..8a4791d 100644
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -107,15 +107,19 @@ typedef struct idefloppy_packet_command_s {
unsigned long flags; /* Status/Action bit flags: long for set_bit */
} idefloppy_pc_t;
-/*
- * Packet command flag bits.
- */
-#define PC_DMA_RECOMMENDED 2 /* 1 when we prefer to use DMA if possible */
-#define PC_DMA_IN_PROGRESS 3 /* 1 while DMA in progress */
-#define PC_DMA_ERROR 4 /* 1 when encountered problem during DMA */
-#define PC_WRITING 5 /* Data direction */
-
-#define PC_SUPPRESS_ERROR 6 /* Suppress error reporting */
+/* Packet command flag bits. */
+enum {
+ /* 1 when we prefer to use DMA if possible */
+ PC_FLAG_DMA_RECOMMENDED = (1 << 0),
+ /* 1 while DMA in progress */
+ PC_FLAG_DMA_IN_PROGRESS = (1 << 1),
+ /* 1 when encountered problem during DMA */
+ PC_FLAG_DMA_ERROR = (1 << 2),
+ /* Data direction */
+ PC_FLAG_WRITING = (1 << 3),
+ /* Suppress error reporting */
+ PC_FLAG_SUPPRESS_ERROR = (1 << 4),
+};
/* format capacities descriptor codes */
#define CAPACITY_INVALID 0x00
@@ -174,14 +178,19 @@ typedef struct ide_floppy_obj {
#define IDEFLOPPY_TICKS_DELAY HZ/20 /* default delay for ZIP 100 (50ms) */
-/*
- * Floppy flag bits values.
- */
-#define IDEFLOPPY_DRQ_INTERRUPT 0 /* DRQ interrupt device */
-#define IDEFLOPPY_MEDIA_CHANGED 1 /* Media may have changed */
-#define IDEFLOPPY_FORMAT_IN_PROGRESS 3 /* Format in progress */
-#define IDEFLOPPY_CLIK_DRIVE 4 /* Avoid commands not supported in Clik drive */
-#define IDEFLOPPY_ZIP_DRIVE 5 /* Requires BH algorithm for packets */
+/* Floppy flag bits values. */
+enum {
+ /* DRQ interrupt device */
+ IDEFLOPPY_FLAG_DRQ_INTERRUPT = (1 << 0),
+ /* Media may have changed */
+ IDEFLOPPY_FLAG_MEDIA_CHANGED = (1 << 1),
+ /* Format in progress */
+ IDEFLOPPY_FLAG_FORMAT_IN_PROGRESS = (1 << 2),
+ /* Avoid commands not supported in Clik drive */
+ IDEFLOPPY_FLAG_CLIK_DRIVE = (1 << 3),
+ /* Requires BH algorithm for packets */
+ IDEFLOPPY_FLAG_ZIP_DRIVE = (1 << 4),
+};
/*
* Defines for the mode sense command
@@ -505,14 +514,14 @@ static ide_startstop_t idefloppy_pc_intr(ide_drive_t *drive)
debug_log("Reached %s interrupt handler\n", __FUNCTION__);
- if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags)) {
+ if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
dma_error = HWIF(drive)->ide_dma_end(drive);
if (dma_error) {
printk(KERN_ERR "%s: DMA %s error\n",
drive->name,
rq_data_dir(rq) == WRITE ? "write" :"read");
- set_bit(PC_DMA_ERROR, &pc->flags);
+ pc->flags |= PC_FLAG_DMA_ERROR;
} else {
pc->actually_transferred = pc->request_transfer;
idefloppy_update_buffers(drive, pc);
@@ -526,11 +535,11 @@ static ide_startstop_t idefloppy_pc_intr(ide_drive_t *drive)
if ((stat & DRQ_STAT) == 0) { /* No more interrupts */
debug_log("Packet command completed, %d bytes transferred\n",
pc->actually_transferred);
- clear_bit(PC_DMA_IN_PROGRESS, &pc->flags);
+ pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
local_irq_enable_in_hardirq();
- if ((stat & ERR_STAT) || test_bit(PC_DMA_ERROR, &pc->flags)) {
+ if ((stat & ERR_STAT) || (pc->flags & PC_FLAG_DMA_ERROR)) {
/* Error detected */
debug_log("I/O error\n", drive->name);
rq->errors++;
@@ -552,7 +561,8 @@ static ide_startstop_t idefloppy_pc_intr(ide_drive_t *drive)
return ide_stopped;
}
- if (test_and_clear_bit(PC_DMA_IN_PROGRESS, &pc->flags)) {
+ if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
+ pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
printk(KERN_ERR "ide-floppy: The floppy wants to issue "
"more interrupts in DMA mode\n");
ide_dma_off(drive);
@@ -569,7 +579,7 @@ static ide_startstop_t idefloppy_pc_intr(ide_drive_t *drive)
printk(KERN_ERR "ide-floppy: CoD != 0 in %s\n", __FUNCTION__);
return ide_do_reset(drive);
}
- if (((ireason & IO) == IO) == test_bit(PC_WRITING, &pc->flags)) {
+ if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) {
/* Hopefully, we will never get here */
printk(KERN_ERR "ide-floppy: We wanted to %s, ",
(ireason & IO) ? "Write" : "Read");
@@ -577,7 +587,7 @@ static ide_startstop_t idefloppy_pc_intr(ide_drive_t *drive)
(ireason & IO) ? "Read" : "Write");
return ide_do_reset(drive);
}
- if (!test_bit(PC_WRITING, &pc->flags)) {
+ if (!(pc->flags & PC_FLAG_WRITING)) {
/* Reading - Check that we have enough space */
temp = pc->actually_transferred + bcount;
if (temp > pc->request_transfer) {
@@ -597,7 +607,7 @@ static ide_startstop_t idefloppy_pc_intr(ide_drive_t *drive)
" expected - allowing transfer\n");
}
}
- if (test_bit(PC_WRITING, &pc->flags))
+ if (pc->flags & PC_FLAG_WRITING)
xferfunc = hwif->atapi_output_bytes;
else
xferfunc = hwif->atapi_input_bytes;
@@ -606,7 +616,7 @@ static ide_startstop_t idefloppy_pc_intr(ide_drive_t *drive)
xferfunc(drive, pc->current_position, bcount);
else
ide_floppy_io_buffers(drive, pc, bcount,
- test_bit(PC_WRITING, &pc->flags));
+ !!(pc->flags & PC_FLAG_WRITING));
/* Update the current position */
pc->actually_transferred += bcount;
@@ -737,7 +747,7 @@ static ide_startstop_t idefloppy_issue_pc (ide_drive_t *drive, idefloppy_pc_t *p
floppy->pc = pc;
if (pc->retries > IDEFLOPPY_MAX_PC_RETRIES) {
- if (!test_bit(PC_SUPPRESS_ERROR, &pc->flags))
+ if (!(pc->flags & PC_FLAG_SUPPRESS_ERROR))
ide_floppy_report_error(floppy, pc);
/* Giving up */
pc->error = IDEFLOPPY_ERROR_GENERAL;
@@ -755,24 +765,25 @@ static ide_startstop_t idefloppy_issue_pc (ide_drive_t *drive, idefloppy_pc_t *p
pc->current_position = pc->buffer;
bcount = min(pc->request_transfer, 63 * 1024);
- if (test_and_clear_bit(PC_DMA_ERROR, &pc->flags))
+ if (pc->flags & PC_FLAG_DMA_ERROR) {
+ pc->flags &= ~PC_FLAG_DMA_ERROR;
ide_dma_off(drive);
-
+ }
dma = 0;
- if (test_bit(PC_DMA_RECOMMENDED, &pc->flags) && drive->using_dma)
+ if ((pc->flags & PC_FLAG_DMA_RECOMMENDED) && drive->using_dma)
dma = !hwif->dma_setup(drive);
ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK |
IDE_TFLAG_OUT_DEVICE, bcount, dma);
if (dma) { /* Begin DMA, if necessary */
- set_bit(PC_DMA_IN_PROGRESS, &pc->flags);
+ pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
hwif->dma_start(drive);
}
/* Can we transfer the packet when we get the interrupt or wait? */
- if (test_bit(IDEFLOPPY_ZIP_DRIVE, &floppy->flags)) {
+ if (floppy->flags & IDEFLOPPY_FLAG_ZIP_DRIVE) {
/* wait */
pkt_xfer_routine = &idefloppy_transfer_pc1;
} else {
@@ -780,7 +791,7 @@ static ide_startstop_t idefloppy_issue_pc (ide_drive_t *drive, idefloppy_pc_t *p
pkt_xfer_routine = &idefloppy_transfer_pc;
}
- if (test_bit (IDEFLOPPY_DRQ_INTERRUPT, &floppy->flags)) {
+ if (floppy->flags & IDEFLOPPY_FLAG_DRQ_INTERRUPT) {
/* Issue the packet command */
ide_execute_command(drive, WIN_PACKETCMD,
pkt_xfer_routine,
@@ -838,7 +849,7 @@ static void idefloppy_create_format_unit_cmd (idefloppy_pc_t *pc, int b, int l,
put_unaligned(cpu_to_be32(b), (unsigned int *)(&pc->buffer[4]));
put_unaligned(cpu_to_be32(l), (unsigned int *)(&pc->buffer[8]));
pc->buffer_size=12;
- set_bit(PC_WRITING, &pc->flags);
+ pc->flags |= PC_FLAG_WRITING;
}
/*
@@ -900,10 +911,10 @@ static void idefloppy_create_rw_cmd(idefloppy_floppy_t *floppy,
pc->rq = rq;
pc->b_count = cmd == READ ? 0 : rq->bio->bi_size;
if (rq->cmd_flags & REQ_RW)
- set_bit(PC_WRITING, &pc->flags);
+ pc->flags |= PC_FLAG_WRITING;
pc->buffer = NULL;
pc->request_transfer = pc->buffer_size = blocks * floppy->block_size;
- set_bit(PC_DMA_RECOMMENDED, &pc->flags);
+ pc->flags |= PC_FLAG_DMA_RECOMMENDED;
}
static void
@@ -915,11 +926,10 @@ idefloppy_blockpc_cmd(idefloppy_floppy_t *floppy, idefloppy_pc_t *pc, struct req
pc->rq = rq;
pc->b_count = rq->data_len;
if (rq->data_len && rq_data_dir(rq) == WRITE)
- set_bit(PC_WRITING, &pc->flags);
+ pc->flags |= PC_FLAG_WRITING;
pc->buffer = rq->data;
if (rq->bio)
- set_bit(PC_DMA_RECOMMENDED, &pc->flags);
-
+ pc->flags |= PC_FLAG_DMA_RECOMMENDED;
/*
* possibly problematic, doesn't look like ide-floppy correctly
* handled scattered requests if dma fails...
@@ -1060,7 +1070,7 @@ static int idefloppy_get_sfrp_bit(ide_drive_t *drive)
idefloppy_create_mode_sense_cmd(&pc, IDEFLOPPY_CAPABILITIES_PAGE,
MODE_SENSE_CURRENT);
- set_bit(PC_SUPPRESS_ERROR, &pc.flags);
+ pc.flags |= PC_FLAG_SUPPRESS_ERROR;
if (idefloppy_queue_pc_tail(drive, &pc))
return 1;
@@ -1113,7 +1123,7 @@ static int ide_floppy_get_capacity(ide_drive_t *drive)
switch (pc.buffer[desc_start + 4] & 0x03) {
/* Clik! drive returns this instead of CAPACITY_CURRENT */
case CAPACITY_UNFORMATTED:
- if (!test_bit(IDEFLOPPY_CLIK_DRIVE, &floppy->flags))
+ if (!(floppy->flags & IDEFLOPPY_FLAG_CLIK_DRIVE))
/*
* If it is not a clik drive, break out
* (maintains previous driver behaviour)
@@ -1159,7 +1169,7 @@ static int ide_floppy_get_capacity(ide_drive_t *drive)
}
/* Clik! disk does not support get_flexible_disk_page */
- if (!test_bit(IDEFLOPPY_CLIK_DRIVE, &floppy->flags))
+ if (!(floppy->flags & IDEFLOPPY_FLAG_CLIK_DRIVE))
(void) ide_floppy_get_flexible_disk_page(drive);
set_capacity(floppy->disk, floppy->blocks * floppy->bs_factor);
@@ -1393,7 +1403,7 @@ static void idefloppy_setup (ide_drive_t *drive, idefloppy_floppy_t *floppy)
*((u16 *) &gcw) = drive->id->config;
floppy->pc = floppy->pc_stack;
if (gcw.drq_type == 1)
- set_bit(IDEFLOPPY_DRQ_INTERRUPT, &floppy->flags);
+ floppy->flags |= IDEFLOPPY_FLAG_DRQ_INTERRUPT;
/*
* We used to check revisions here. At this point however
* I'm giving up. Just assume they are all broken, its easier.
@@ -1406,7 +1416,7 @@ static void idefloppy_setup (ide_drive_t *drive, idefloppy_floppy_t *floppy)
*/
if (!strncmp(drive->id->model, "IOMEGA ZIP 100 ATAPI", 20)) {
- set_bit(IDEFLOPPY_ZIP_DRIVE, &floppy->flags);
+ floppy->flags |= IDEFLOPPY_FLAG_ZIP_DRIVE;
/* This value will be visible in the /proc/ide/hdx/settings */
floppy->ticks = IDEFLOPPY_TICKS_DELAY;
blk_queue_max_sectors(drive->queue, 64);
@@ -1419,7 +1429,7 @@ static void idefloppy_setup (ide_drive_t *drive, idefloppy_floppy_t *floppy)
*/
if (strncmp(drive->id->model, "IOMEGA Clik!", 11) == 0) {
blk_queue_max_sectors(drive->queue, 64);
- set_bit(IDEFLOPPY_CLIK_DRIVE, &floppy->flags);
+ floppy->flags |= IDEFLOPPY_FLAG_CLIK_DRIVE;
}
@@ -1509,7 +1519,7 @@ static int idefloppy_open(struct inode *inode, struct file *filp)
floppy->openers++;
if (floppy->openers == 1) {
- clear_bit(IDEFLOPPY_FORMAT_IN_PROGRESS, &floppy->flags);
+ floppy->flags &= ~IDEFLOPPY_FLAG_FORMAT_IN_PROGRESS;
/* Just in case */
idefloppy_create_test_unit_ready_cmd(&pc);
@@ -1534,14 +1544,14 @@ static int idefloppy_open(struct inode *inode, struct file *filp)
ret = -EROFS;
goto out_put_floppy;
}
- set_bit(IDEFLOPPY_MEDIA_CHANGED, &floppy->flags);
+ floppy->flags |= IDEFLOPPY_FLAG_MEDIA_CHANGED;
/* IOMEGA Clik! drives do not support lock/unlock commands */
- if (!test_bit(IDEFLOPPY_CLIK_DRIVE, &floppy->flags)) {
+ if (!(floppy->flags & IDEFLOPPY_FLAG_CLIK_DRIVE)) {
idefloppy_create_prevent_cmd(&pc, 1);
(void) idefloppy_queue_pc_tail(drive, &pc);
}
check_disk_change(inode->i_bdev);
- } else if (test_bit(IDEFLOPPY_FORMAT_IN_PROGRESS, &floppy->flags)) {
+ } else if (floppy->flags & IDEFLOPPY_FLAG_FORMAT_IN_PROGRESS) {
ret = -EBUSY;
goto out_put_floppy;
}
@@ -1564,12 +1574,12 @@ static int idefloppy_release(struct inode *inode, struct file *filp)
if (floppy->openers == 1) {
/* IOMEGA Clik! drives do not support lock/unlock commands */
- if (!test_bit(IDEFLOPPY_CLIK_DRIVE, &floppy->flags)) {
+ if (!(floppy->flags & IDEFLOPPY_FLAG_CLIK_DRIVE)) {
idefloppy_create_prevent_cmd(&pc, 0);
(void) idefloppy_queue_pc_tail(drive, &pc);
}
- clear_bit(IDEFLOPPY_FORMAT_IN_PROGRESS, &floppy->flags);
+ floppy->flags &= ~IDEFLOPPY_FLAG_FORMAT_IN_PROGRESS;
}
floppy->openers--;
@@ -1598,7 +1608,7 @@ static int ide_floppy_lockdoor(idefloppy_floppy_t *floppy, idefloppy_pc_t *pc,
/* The IOMEGA Clik! Drive doesn't support this command -
* no room for an eject mechanism */
- if (!test_bit(IDEFLOPPY_CLIK_DRIVE, &floppy->flags)) {
+ if (!(floppy->flags & IDEFLOPPY_FLAG_CLIK_DRIVE)) {
int prevent = arg ? 1 : 0;
if (cmd == CDROMEJECT)
@@ -1624,11 +1634,11 @@ static int ide_floppy_format_unit(idefloppy_floppy_t *floppy,
if (floppy->openers > 1) {
/* Don't format if someone is using the disk */
- clear_bit(IDEFLOPPY_FORMAT_IN_PROGRESS, &floppy->flags);
+ floppy->flags &= ~IDEFLOPPY_FLAG_FORMAT_IN_PROGRESS;
return -EBUSY;
}
- set_bit(IDEFLOPPY_FORMAT_IN_PROGRESS, &floppy->flags);
+ floppy->flags |= IDEFLOPPY_FLAG_FORMAT_IN_PROGRESS;
/*
* Send ATAPI_FORMAT_UNIT to the drive.
@@ -1660,7 +1670,7 @@ static int ide_floppy_format_unit(idefloppy_floppy_t *floppy,
out:
if (err)
- clear_bit(IDEFLOPPY_FORMAT_IN_PROGRESS, &floppy->flags);
+ floppy->flags &= ~IDEFLOPPY_FLAG_FORMAT_IN_PROGRESS;
return err;
}
@@ -1713,13 +1723,16 @@ static int idefloppy_media_changed(struct gendisk *disk)
{
struct ide_floppy_obj *floppy = ide_floppy_g(disk);
ide_drive_t *drive = floppy->drive;
+ int ret;
/* do not scan partitions twice if this is a removable device */
if (drive->attach) {
drive->attach = 0;
return 0;
}
- return test_and_clear_bit(IDEFLOPPY_MEDIA_CHANGED, &floppy->flags);
+ ret = floppy->flags & IDEFLOPPY_FLAG_MEDIA_CHANGED;
+ floppy->flags &= ~IDEFLOPPY_FLAG_MEDIA_CHANGED;
+ return ret;
}
static int idefloppy_revalidate_disk(struct gendisk *disk)
--
1.5.3.7
--
Regards/Gruß,
Boris.
--
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