Messages in this thread Patch in this message | | | From | Jia-Ju Bai <> | Subject | [PATCH 2/2] net: can: sja1000: Replace mdelay with usleep_range in pcan_add_channels | Date | Wed, 11 Apr 2018 09:43:26 +0800 |
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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> --- drivers/net/can/sja1000/peak_pcmcia.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/can/sja1000/peak_pcmcia.c b/drivers/net/can/sja1000/peak_pcmcia.c index dd56133..1a1fbf3 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); -- 1.9.1
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