2017-12-06 17:23:09

by Arvind Yadav

Subject: [PATCH v5] pata_pdc2027x: Fix pdc_adjust_pll() to return the error value

This change is to ensure that function pdc_adjust_pll() returns the
error value to avoid the unnecessary error check for pdc_hardware_init()
in pdc2027x_reinit_one().

Signed-off-by: Arvind Yadav <[email protected]>
---
changes in v2 :
Make function return type 'void' instead of 'int.
Add sapce between ':'.
changes in v3 :
Fix the checkpatch.pl errors in a sperate patch.
changes in v4 :
return the error value from pdc_adjust_pll()
changes in v5 :
remove this empty line (between *return* and }).

drivers/ata/pata_pdc2027x.c | 14 ++++++--------
1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/ata/pata_pdc2027x.c b/drivers/ata/pata_pdc2027x.c
index ffd8d33..81f9178 100644
--- a/drivers/ata/pata_pdc2027x.c
+++ b/drivers/ata/pata_pdc2027x.c
@@ -515,7 +515,7 @@ static long pdc_read_counter(struct ata_host *host)
* @host: target ATA host
* @pll_clock: The input of PLL in HZ
*/
-static void pdc_adjust_pll(struct ata_host *host, long pll_clock, unsigned int board_idx)
+static int pdc_adjust_pll(struct ata_host *host, long pll_clock, unsigned int board_idx)
{
void __iomem *mmio_base = host->iomap[PDC_MMIO_BAR];
u16 pll_ctl;
@@ -527,7 +527,7 @@ static void pdc_adjust_pll(struct ata_host *host, long pll_clock, unsigned int b
/* Sanity check */
if (unlikely(pll_clock_khz < 5000L || pll_clock_khz > 70000L)) {
printk(KERN_ERR DRV_NAME ": Invalid PLL input clock %ldkHz, give up!\n", pll_clock_khz);
- return;
+ return -EINVAL;
}

#ifdef PDC_DEBUG
@@ -559,7 +559,7 @@ static void pdc_adjust_pll(struct ata_host *host, long pll_clock, unsigned int b
} else {
/* Invalid ratio */
printk(KERN_ERR DRV_NAME ": Invalid ratio %ld, give up!\n", ratio);
- return;
+ return -EINVAL;
}

F = (ratio * (R+2)) / 1000 - 2;
@@ -567,7 +567,7 @@ static void pdc_adjust_pll(struct ata_host *host, long pll_clock, unsigned int b
if (unlikely(F < 0 || F > 127)) {
/* Invalid F */
printk(KERN_ERR DRV_NAME ": F[%d] invalid!\n", F);
- return;
+ return -EINVAL;
}

PDPRINTK("F[%d] R[%d] ratio*1000[%ld]\n", F, R, ratio);
@@ -592,7 +592,7 @@ static void pdc_adjust_pll(struct ata_host *host, long pll_clock, unsigned int b
PDPRINTK("pll_ctl[%X]\n", pll_ctl);
#endif

- return;
+ return 0;
}

/**
@@ -664,9 +664,7 @@ static int pdc_hardware_init(struct ata_host *host, unsigned int board_idx)
dev_info(host->dev, "PLL input clock %ld kHz\n", pll_clock/1000);

/* Adjust PLL control register */
- pdc_adjust_pll(host, pll_clock, board_idx);
-
- return 0;
+ return pdc_adjust_pll(host, pll_clock, board_idx);
}

/**
--
2.7.4

2017-12-11 15:10:29

by Tejun Heo

Subject: Re: [PATCH v5] pata_pdc2027x: Fix pdc_adjust_pll() to return the error value

On Wed, Dec 06, 2017 at 10:52:54PM +0530, Arvind Yadav wrote:
> This change is to ensure that function pdc_adjust_pll() returns the
> error value to avoid the unnecessary error check for pdc_hardware_init()
> in pdc2027x_reinit_one().
>
> Signed-off-by: Arvind Yadav <[email protected]>

Doesn't apply on libata/for-4.16.

Thanks.

--
tejun