Messages in this thread | | | Date | Wed, 6 Dec 2017 15:40:35 +0100 | From | Sascha Hauer <> | Subject | Re: [PATCH v2 5/5] rtc: add mxc driver for i.MX53 SRTC |
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On Wed, Dec 06, 2017 at 10:17:06AM +0000, Patrick Brünn wrote: > >From: Sascha Hauer [mailto:s.hauer@pengutronix.de] > >Sent: Mittwoch, 6. Dezember 2017 09:36 > >On Tue, Dec 05, 2017 at 03:06:46PM +0100, linux-kernel-dev@beckhoff.com > >wrote: > >> +static int mxc_rtc_wait_for_flag(void *__iomem ioaddr, int flag) > >> +{ > >> + unsigned int timeout = REG_READ_TIMEOUT; > >> + > >> + while (!(readl(ioaddr) & flag)) { > >> + if (!--timeout) { > >> + pr_err("Wait timeout for 0x%x@%p!\n", flag, ioaddr); > > > >Please use dev_* functions for printing. In this case the message should > >probably be printed from the caller. > Do you have a link at hand about dev_* vs. pr_*? I just choose pr_err here, > because I would have to change the functions signature to get a device. > However, I will drop the message and move it to the caller.
No, I don't have a link. However, a message printed with pr_err comes with absolutely no context, so without grepping the source you do not get a clue which device has a problem. You could add more context using some prefix either to each message or by using
#define pr_fmt(fmt) "mydriver: " fmt
but then you still not know which instance the message throws. Using dev_* just does the right thing without much thinking.
Sascha
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