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mmc: mmc_spi: Simplify busy loop in mmc_spi_skip()

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Infinite loops are hard to read and understand because of
hidden main loop condition. Simplify such one in mmc_spi_skip().

Using schedule() to schedule (and be friendly to others)
is discouraged and cond_resched() should be used instead.
Hence, replace schedule() with cond_resched() at the same
time.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20210623101731.87885-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Andy Shevchenko 2021-06-23 13:17:31 +03:00 committed by Ulf Hansson
parent 575cf10469
commit 696068470e
1 changed files with 4 additions and 11 deletions
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15
drivers/mmc/host/mmc_spi.c
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@ -180,7 +180,7 @@ static int mmc_spi_skip(struct mmc_spi_host *host, unsigned long timeout,
u8 *cp = host->data->status;
unsigned long start = jiffies;
while (1) {
do {
int status;
unsigned i;
@ -193,16 +193,9 @@ static int mmc_spi_skip(struct mmc_spi_host *host, unsigned long timeout,
return cp[i];
}
if (time_is_before_jiffies(start + timeout))
break;
/* If we need long timeouts, we may release the CPU.
* We use jiffies here because we want to have a relation
* between elapsed time and the blocking of the scheduler.
*/
if (time_is_before_jiffies(start + 1))
schedule();
}
/* If we need long timeouts, we may release the CPU */
cond_resched();
} while (time_is_after_jiffies(start + timeout));
return -ETIMEDOUT;
}