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ide: fix kmalloc() failure handling in ide_driveid_update() 

* Doing kmalloc() in the middle of command execution is not only ugly
  but leaves drive waiting to send data on kmalloc() failure.  Fix it.

While at it:

* Unify error code paths.

* Fixup error message to be more useful and add missing KERN_ERR level.

* Rename 'stat' variable to 's'.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2009-03-24 23:22:54 +01:00
parent d45b70ab9b
commit 2f40c9b0b6
1 changed files with 20 additions and 13 deletions
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33
drivers/ide/ide-iops.c
View File

@ -293,7 +293,12 @@ int ide_driveid_update(ide_drive_t *drive)
const struct ide_tp_ops *tp_ops = hwif->tp_ops;
u16 *id;
unsigned long flags;
u8 stat;
int rc;
u8 uninitialized_var(s);
id = kmalloc(SECTOR_SIZE, GFP_ATOMIC);
if (id == NULL)
return 0;
/*
* Re-read drive->id for possible DMA mode
@ -306,25 +311,21 @@ int ide_driveid_update(ide_drive_t *drive)
tp_ops->exec_command(hwif, ATA_CMD_ID_ATA);
if (ide_busy_sleep(hwif, WAIT_WORSTCASE, 1)) {
SELECT_MASK(drive, 0);
return 0;
rc = 1;
goto out_err;
}
msleep(50); /* wait for IRQ and ATA_DRQ */
stat = tp_ops->read_status(hwif);
if (!OK_STAT(stat, ATA_DRQ, BAD_R_STAT)) {
SELECT_MASK(drive, 0);
printk("%s: CHECK for good STATUS\n", drive->name);
return 0;
s = tp_ops->read_status(hwif);
if (!OK_STAT(s, ATA_DRQ, BAD_R_STAT)) {
rc = 2;
goto out_err;
}
local_irq_save(flags);
SELECT_MASK(drive, 0);
id = kmalloc(SECTOR_SIZE, GFP_ATOMIC);
if (!id) {
local_irq_restore(flags);
return 0;
}
tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
(void)tp_ops->read_status(hwif); /* clear drive IRQ */
local_irq_enable();
@ -342,6 +343,12 @@ int ide_driveid_update(ide_drive_t *drive)
ide_dma_off(drive);
return 1;
out_err:
SELECT_MASK(drive, 0);
if (rc == 2)
printk(KERN_ERR "%s: %s: bad status\n", drive->name, __func__);
kfree(id);
return 0;
}
int ide_config_drive_speed(ide_drive_t *drive, u8 speed)