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Subject[PATCH] libata: reduce ata_pci_[sff,bmdma]_init_one() size
Date
From: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Subject: [PATCH] libata: reduce ata_pci_[sff,bmdma]_init_one() size

Turn both helpers (which are used only during LLDs initialization
time and thus are not performance sensitive) into wrappers around
the new ata_pci_init_one() function, this cuts 20 LOC and saves
~1.1k of the output code size (x86-64):

text data bss dec hex filename
21392 0 19 21411 53a3 drivers/ata/libata-sff.o.before
20256 0 19 20275 4f33 drivers/ata/libata-sff.o.after

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
---
earlier references:
https://lkml.org/lkml/2011/2/9/150

drivers/ata/libata-sff.c | 111 +++++++++++++++++++----------------------------
1 file changed, 46 insertions(+), 65 deletions(-)

Index: b/drivers/ata/libata-sff.c
===================================================================
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -2507,31 +2507,10 @@ static const struct ata_port_info *ata_s
return NULL;
}

-/**
- * ata_pci_sff_init_one - Initialize/register PIO-only PCI IDE controller
- * @pdev: Controller to be initialized
- * @ppi: array of port_info, must be enough for two ports
- * @sht: scsi_host_template to use when registering the host
- * @host_priv: host private_data
- * @hflag: host flags
- *
- * This is a helper function which can be called from a driver's
- * xxx_init_one() probe function if the hardware uses traditional
- * IDE taskfile registers and is PIO only.
- *
- * ASSUMPTION:
- * Nobody makes a single channel controller that appears solely as
- * the secondary legacy port on PCI.
- *
- * LOCKING:
- * Inherited from PCI layer (may sleep).
- *
- * RETURNS:
- * Zero on success, negative on errno-based value on error.
- */
-int ata_pci_sff_init_one(struct pci_dev *pdev,
- const struct ata_port_info * const *ppi,
- struct scsi_host_template *sht, void *host_priv, int hflag)
+static int ata_pci_init_one(struct pci_dev *pdev,
+ const struct ata_port_info * const *ppi,
+ struct scsi_host_template *sht, void *host_priv,
+ int hflags, bool bmdma)
{
struct device *dev = &pdev->dev;
const struct ata_port_info *pi;
@@ -2553,14 +2532,22 @@ int ata_pci_sff_init_one(struct pci_dev
if (rc)
goto out;

- /* prepare and activate SFF host */
- rc = ata_pci_sff_prepare_host(pdev, ppi, &host);
+ if (bmdma)
+ /* prepare and activate BMDMA host */
+ rc = ata_pci_bmdma_prepare_host(pdev, ppi, &host);
+ else
+ /* prepare and activate SFF host */
+ rc = ata_pci_sff_prepare_host(pdev, ppi, &host);
if (rc)
goto out;
host->private_data = host_priv;
- host->flags |= hflag;
+ host->flags |= hflags;

- rc = ata_pci_sff_activate_host(host, ata_sff_interrupt, sht);
+ if (bmdma) {
+ pci_set_master(pdev);
+ rc = ata_pci_sff_activate_host(host, ata_bmdma_interrupt, sht);
+ } else
+ rc = ata_pci_sff_activate_host(host, ata_sff_interrupt, sht);
out:
if (rc == 0)
devres_remove_group(&pdev->dev, NULL);
@@ -2569,6 +2556,35 @@ out:

return rc;
}
+
+/**
+ * ata_pci_sff_init_one - Initialize/register PIO-only PCI IDE controller
+ * @pdev: Controller to be initialized
+ * @ppi: array of port_info, must be enough for two ports
+ * @sht: scsi_host_template to use when registering the host
+ * @host_priv: host private_data
+ * @hflag: host flags
+ *
+ * This is a helper function which can be called from a driver's
+ * xxx_init_one() probe function if the hardware uses traditional
+ * IDE taskfile registers and is PIO only.
+ *
+ * ASSUMPTION:
+ * Nobody makes a single channel controller that appears solely as
+ * the secondary legacy port on PCI.
+ *
+ * LOCKING:
+ * Inherited from PCI layer (may sleep).
+ *
+ * RETURNS:
+ * Zero on success, negative on errno-based value on error.
+ */
+int ata_pci_sff_init_one(struct pci_dev *pdev,
+ const struct ata_port_info * const *ppi,
+ struct scsi_host_template *sht, void *host_priv, int hflag)
+{
+ return ata_pci_init_one(pdev, ppi, sht, host_priv, hflag, 0);
+}
EXPORT_SYMBOL_GPL(ata_pci_sff_init_one);

#endif /* CONFIG_PCI */
@@ -3286,42 +3302,7 @@ int ata_pci_bmdma_init_one(struct pci_de
struct scsi_host_template *sht, void *host_priv,
int hflags)
{
- struct device *dev = &pdev->dev;
- const struct ata_port_info *pi;
- struct ata_host *host = NULL;
- int rc;
-
- DPRINTK("ENTER\n");
-
- pi = ata_sff_find_valid_pi(ppi);
- if (!pi) {
- dev_err(&pdev->dev, "no valid port_info specified\n");
- return -EINVAL;
- }
-
- if (!devres_open_group(dev, NULL, GFP_KERNEL))
- return -ENOMEM;
-
- rc = pcim_enable_device(pdev);
- if (rc)
- goto out;
-
- /* prepare and activate BMDMA host */
- rc = ata_pci_bmdma_prepare_host(pdev, ppi, &host);
- if (rc)
- goto out;
- host->private_data = host_priv;
- host->flags |= hflags;
-
- pci_set_master(pdev);
- rc = ata_pci_sff_activate_host(host, ata_bmdma_interrupt, sht);
- out:
- if (rc == 0)
- devres_remove_group(&pdev->dev, NULL);
- else
- devres_release_group(&pdev->dev, NULL);
-
- return rc;
+ return ata_pci_init_one(pdev, ppi, sht, host_priv, hflags, 1);
}
EXPORT_SYMBOL_GPL(ata_pci_bmdma_init_one);


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