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| author | Jia-Ju Bai <baijiaju1990@gmail.com> | 2018-01-25 13:45:05 +0300 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2018-01-25 18:28:31 +0300 |
| commit | b3506c7ed216dd2db1f06c2845da45018e2c508d (patch) | |
| tree | cc46253531a7aea4f48ec8ac1b50260ac33ee45d | |
| parent | eada8598e69f9ff767c387951f40bab5aafe6a88 (diff) | |
| download | linux-b3506c7ed216dd2db1f06c2845da45018e2c508d.tar.xz | |
ata: pata_pdc2027x: Replace mdelay with msleep
After checking all possible call chains to pdc_adjust_pll and
pdc_detect_pll_input_clock,
my tool finds that these functions are never called in atomic context,
namely never in an interrupt handler or holding a spinlock.
And their caller functions pdc2027x_init_one and pdc2027x_reinit_one
calls pci_enable_device which can sleep, and no spinlock is held when
calling pdc_adjust_pll and pdc_detect_pll_input_clock,
so it proves that pdc_adjust_pll and pdc_detect_pll_input_clock
can call functions which can sleep.
Thus mdelay can be replaced with msleep to avoid busy wait.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
| -rw-r--r-- | drivers/ata/pata_pdc2027x.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/ata/pata_pdc2027x.c b/drivers/ata/pata_pdc2027x.c index 6db2e34bd52f..1a18e675ba9f 100644 --- a/drivers/ata/pata_pdc2027x.c +++ b/drivers/ata/pata_pdc2027x.c @@ -580,7 +580,7 @@ static void pdc_adjust_pll(struct ata_host *host, long pll_clock, unsigned int b ioread16(mmio_base + PDC_PLL_CTL); /* flush */ /* Wait the PLL circuit to be stable */ - mdelay(30); + msleep(30); #ifdef PDC_DEBUG /* @@ -620,7 +620,7 @@ static long pdc_detect_pll_input_clock(struct ata_host *host) start_time = ktime_get(); /* Let the counter run for 100 ms. */ - mdelay(100); + msleep(100); /* Read the counter values again */ end_count = pdc_read_counter(host); |