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| author | Jia-Ju Bai <baijiaju1990@gmail.com> | 2018-04-11 09:43:26 +0800 |
|---|---|---|
| committer | Marc Kleine-Budde <mkl@pengutronix.de> | 2018-07-27 10:40:17 +0200 |
| commit | c8d4dea2a82b0e1c695646aaabdada130ab71f79 (patch) | |
| tree | ee0b9643133f050e3809a15e720d0e11306bcf0c /drivers/net/can/sja1000 | |
| parent | 276b7361bb1be3dccbc10b5be93cfee4bef2249c (diff) | |
| download | linux-c8d4dea2a82b0e1c695646aaabdada130ab71f79.tar.bz2 | |
can: sja1000: Replace mdelay with usleep_range in pcan_add_channels
pcan_add_channels() is never called in atomic context.
pcan_add_channels() is only called by pcan_probe(), which is only set as
".probe" in struct pcmcia_driver.
Despite never getting called from atomic context, pcan_add_channels()
calls mdelay() to busily wait.
This is not necessary and can be replaced with usleep_range() to
avoid busy waiting.
This is found by a static analysis tool named DCNS written by myself.
And I also manually check it.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'drivers/net/can/sja1000')
| -rw-r--r-- | drivers/net/can/sja1000/peak_pcmcia.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/can/sja1000/peak_pcmcia.c b/drivers/net/can/sja1000/peak_pcmcia.c index 485b19c9ae47..b8c39ede7cd5 100644 --- a/drivers/net/can/sja1000/peak_pcmcia.c +++ b/drivers/net/can/sja1000/peak_pcmcia.c @@ -530,7 +530,7 @@ static int pcan_add_channels(struct pcan_pccard *card) pcan_write_reg(card, PCC_CCR, ccr); /* wait 2ms before unresetting channels */ - mdelay(2); + usleep_range(2000, 3000); ccr &= ~PCC_CCR_RST_ALL; pcan_write_reg(card, PCC_CCR, ccr); |