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libata: remove superfluous NULL pointer checks

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host->ports[] always contain pointers to valid port structures since
a "dummy port" structure is used in case if there is no physical port.

This patch takes care of two entries from Dan's list:

drivers/ata/sata_sil.c +535 sil_interrupt(13) warning: variable derefenced before check 'ap'
drivers/ata/sata_mv.c +2517 mv_unexpected_intr(6) warning: variable derefenced before check 'ap'

and of another needless NULL pointer check in pata_octeon_cf.c.

Reported-by: Dan Carpenter <error27@gmail.com>
Cc: corbet@lwn.net
Cc: eteo@redhat.com
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2009-07-26 16:05:13 +02:00 • committed by Jeff Garzik
parent 705d201414
commit c9abde12d6
3 changed files with 4 additions and 3 deletions
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3
drivers/ata/pata_octeon_cf.c
View file

@ -653,7 +653,8 @@ static irqreturn_t octeon_cf_interrupt(int irq, void *dev_instance)
ap = host->ports[i]; ap = host->ports[i];
ocd = ap->dev->platform_data; ocd = ap->dev->platform_data;
if (!ap || (ap->flags & ATA_FLAG_DISABLED))
if (ap->flags & ATA_FLAG_DISABLED)
continue; continue;
ocd = ap->dev->platform_data; ocd = ap->dev->platform_data;

2
drivers/ata/sata_mv.c
View file

@ -2514,7 +2514,7 @@ static void mv_unexpected_intr(struct ata_port *ap, int edma_was_enabled)
char *when = "idle"; char *when = "idle";
ata_ehi_clear_desc(ehi); ata_ehi_clear_desc(ehi);
if (!ap || (ap->flags & ATA_FLAG_DISABLED)) { if (ap->flags & ATA_FLAG_DISABLED) {
when = "disabled"; when = "disabled";
} else if (edma_was_enabled) { } else if (edma_was_enabled) {
when = "EDMA enabled"; when = "EDMA enabled";

2
drivers/ata/sata_sil.c
View file

@ -532,7 +532,7 @@ static irqreturn_t sil_interrupt(int irq, void *dev_instance)
struct ata_port *ap = host->ports[i]; struct ata_port *ap = host->ports[i];
u32 bmdma2 = readl(mmio_base + sil_port[ap->port_no].bmdma2); u32 bmdma2 = readl(mmio_base + sil_port[ap->port_no].bmdma2);
if (unlikely(!ap || ap->flags & ATA_FLAG_DISABLED)) if (unlikely(ap->flags & ATA_FLAG_DISABLED))
continue; continue;
/* turn off SATA_IRQ if not supported */ /* turn off SATA_IRQ if not supported */