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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>
This commit is contained in:
Jia-Ju Bai 2018-01-25 18:45:05 +08:00 committed by Tejun Heo
parent eada8598e6
commit b3506c7ed2
1 changed files with 2 additions and 2 deletions
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4
drivers/ata/pata_pdc2027x.c
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@ -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);