diff options
author | 2022-02-13 18:10:32 +0300 | |
---|---|---|
committer | 2022-02-20 09:03:17 +0900 | |
commit | 03c0e84f9c1e166d57d06b04497e11205f48e9a8 (patch) | |
tree | fe20aeb4b80dc56246861988b23de8361287e5e7 /drivers/ata | |
parent | ata: libata-sff: refactor ata_sff_set_devctl() (diff) | |
download | linux-03c0e84f9c1e166d57d06b04497e11205f48e9a8.tar.gz linux-03c0e84f9c1e166d57d06b04497e11205f48e9a8.tar.bz2 linux-03c0e84f9c1e166d57d06b04497e11205f48e9a8.zip |
ata: libata-sff: refactor ata_sff_altstatus()
The driver's calls to ata_sff_altstatus() are mostly surrounded by some
clumsy checks. Refactor ata_sff_altstatus() to include the repetitive
checks and return a 'bool' result indicating if the alternate status
register exists or not.
While at it, further update the 'kernel-doc' comment -- the alternate
status register has never been a part of the taskfile, despite what
Jeff and co. think! :-)
In ata_sff_lost_interrupt(), wrap the ata_sff_altstatus() call in a
WARN_ON_ONCE() check to issue a warning if the device control register
does not exist. And while at it, fix the strange argument indentation
in the ata_port_warn() call following the call to ata_sff_altstatus().
Signed-off-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Diffstat (limited to 'drivers/ata')
-rw-r--r-- | drivers/ata/libata-sff.c | 59 |
1 files changed, 33 insertions, 26 deletions
diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c index aefe8af5cdac..2fb3956f66f6 100644 --- a/drivers/ata/libata-sff.c +++ b/drivers/ata/libata-sff.c @@ -70,22 +70,35 @@ EXPORT_SYMBOL_GPL(ata_sff_check_status); /** * ata_sff_altstatus - Read device alternate status reg * @ap: port where the device is + * @status: pointer to a status value * - * Reads ATA taskfile alternate status register for - * currently-selected device and return its value. + * Reads ATA alternate status register for currently-selected device + * and return its value. * - * Note: may NOT be used as the check_altstatus() entry in - * ata_port_operations. + * RETURN: + * true if the register exists, false if not. * * LOCKING: * Inherited from caller. */ -static u8 ata_sff_altstatus(struct ata_port *ap) +static bool ata_sff_altstatus(struct ata_port *ap, u8 *status) { - if (ap->ops->sff_check_altstatus) - return ap->ops->sff_check_altstatus(ap); + u8 tmp; + + if (ap->ops->sff_check_altstatus) { + tmp = ap->ops->sff_check_altstatus(ap); + goto read; + } + if (ap->ioaddr.altstatus_addr) { + tmp = ioread8(ap->ioaddr.altstatus_addr); + goto read; + } + return false; - return ioread8(ap->ioaddr.altstatus_addr); +read: + if (status) + *status = tmp; + return true; } /** @@ -104,12 +117,9 @@ static u8 ata_sff_irq_status(struct ata_port *ap) { u8 status; - if (ap->ops->sff_check_altstatus || ap->ioaddr.altstatus_addr) { - status = ata_sff_altstatus(ap); - /* Not us: We are busy */ - if (status & ATA_BUSY) - return status; - } + /* Not us: We are busy */ + if (ata_sff_altstatus(ap, &status) && (status & ATA_BUSY)) + return status; /* Clear INTRQ latch */ status = ap->ops->sff_check_status(ap); return status; @@ -129,10 +139,7 @@ static u8 ata_sff_irq_status(struct ata_port *ap) static void ata_sff_sync(struct ata_port *ap) { - if (ap->ops->sff_check_altstatus) - ap->ops->sff_check_altstatus(ap); - else if (ap->ioaddr.altstatus_addr) - ioread8(ap->ioaddr.altstatus_addr); + ata_sff_altstatus(ap, NULL); } /** @@ -164,12 +171,12 @@ EXPORT_SYMBOL_GPL(ata_sff_pause); void ata_sff_dma_pause(struct ata_port *ap) { - if (ap->ops->sff_check_altstatus || ap->ioaddr.altstatus_addr) { - /* An altstatus read will cause the needed delay without - messing up the IRQ status */ - ata_sff_altstatus(ap); + /* + * An altstatus read will cause the needed delay without + * messing up the IRQ status + */ + if (ata_sff_altstatus(ap, NULL)) return; - } /* There are no DMA controllers without ctl. BUG here to ensure we never violate the HDMA1:0 transition timing and risk corruption. */ @@ -1637,14 +1644,14 @@ void ata_sff_lost_interrupt(struct ata_port *ap) return; /* See if the controller thinks it is still busy - if so the command isn't a lost IRQ but is still in progress */ - status = ata_sff_altstatus(ap); + if (WARN_ON_ONCE(!ata_sff_altstatus(ap, &status))) + return; if (status & ATA_BUSY) return; /* There was a command running, we are no longer busy and we have no interrupt. */ - ata_port_warn(ap, "lost interrupt (Status 0x%x)\n", - status); + ata_port_warn(ap, "lost interrupt (Status 0x%x)\n", status); /* Run the host interrupt logic as if the interrupt had not been lost */ ata_sff_port_intr(ap, qc); |