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driver, iio, mpuxxx: do nothing when fifo count is zero

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if fifo count is zero, just wait for data ready, there is
no need to reset HW and SW fifo, or things may worse

Change-Id: Ie65cdfde9c4939be772861f5c0842fb66c384827
Signed-off-by: Zorro Liu <lyx@rock-chips.com>
This commit is contained in:
Zorro Liu 2016-06-17 11:43:19 +08:00
parent 0497b48af6
commit 98827e305e
1 changed files with 2 additions and 0 deletions
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2
drivers/staging/iio/imu/inv_mpu/inv_mpu_ring.c
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@ -1002,8 +1002,10 @@ irqreturn_t inv_read_fifo(int irq, void *dev_id)
if (result)
goto end_session;
fifo_count = be16_to_cpup((__be16 *)(&data[0]));
/*
if (fifo_count == 0)
goto flush_fifo;
*/
if (fifo_count < bytes_per_datum)
goto end_session;
/* fifo count can't be odd number */