linux-kernel - Re: [PATCH v2] mmc: Convert from tasklet to BH workqueue

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Date: Thu, 13 Jun 2024 13:59:21 -0700
From: Allen <allen.lkml@...il.com>
To: Adrian Hunter <adrian.hunter@...el.com>
Cc: Aubin Constans <aubin.constans@...rochip.com>, Ulf Hansson <ulf.hansson@...aro.org>, 
	Nicolas Ferre <nicolas.ferre@...rochip.com>, 
	Alexandre Belloni <alexandre.belloni@...tlin.com>, Claudiu Beznea <claudiu.beznea@...on.dev>, 
	Manuel Lauss <manuel.lauss@...il.com>, Michał Mirosław <mirq-linux@...e.qmqm.pl>, 
	Jaehoon Chung <jh80.chung@...sung.com>, Aaro Koskinen <aaro.koskinen@....fi>, 
	Wolfram Sang <wsa+renesas@...g-engineering.com>, 
	Florian Fainelli <florian.fainelli@...adcom.com>, Ray Jui <rjui@...adcom.com>, 
	Scott Branden <sbranden@...adcom.com>, 
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>, Alex Dubov <oakad@...oo.com>, 
	Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>, Masami Hiramatsu <mhiramat@...nel.org>, 
	Bruce Chang <brucechang@....com.tw>, Harald Welte <HaraldWelte@...tech.com>, 
	Pierre Ossman <pierre@...man.eu>, Christian Loehle <christian.loehle@....com>, linux-mmc@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	linux-omap@...r.kernel.org, linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH v2] mmc: Convert from tasklet to BH workqueue

> > The only generic interface to execute asynchronously in the BH context is
> > tasklet; however, it's marked deprecated and has some design flaws. To
> > replace tasklets, BH workqueue support was recently added. A BH workqueue
> > behaves similarly to regular workqueues except that the queued work items
> > are executed in the BH context.
> >
> > This patch converts drivers/mmc/* from tasklet to BH workqueue.
> >
> > Based on the work done by Tejun Heo <tj@...nel.org>
> >
> > Tested-by: Christian Loehle <christian.loehle@....com>
> > Tested-by: Aubin Constans <aubin.constans@...rochip.com>
> > Acked-by: Aubin Constans <aubin.constans@...rochip.com>
> > Acked-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
> > Reviewed-by: Christian Loehle <christian.loehle@....com>
> > Signed-off-by: Allen Pais <allen.lkml@...il.com>
> > ---
> > v2:
> >    - fixed patch styling issues
> >    - rename work to bh_work
> >
> > Link to v1:
> > https://lore.kernel.org/all/20240327160314.9982-10-apais@linux.microsoft.com/
> >
>
> [SNIP]
>
> > diff --git a/drivers/mmc/host/sdhci-bcm-kona.c b/drivers/mmc/host/sdhci-bcm-kona.c
> > index cb9152c6a65d..9c215db81b2b 100644
> > --- a/drivers/mmc/host/sdhci-bcm-kona.c
> > +++ b/drivers/mmc/host/sdhci-bcm-kona.c
> > @@ -107,7 +107,7 @@ static void sdhci_bcm_kona_sd_init(struct sdhci_host *host)
> >   * Software emulation of the SD card insertion/removal. Set insert=1 for insert
> >   * and insert=0 for removal. The card detection is done by GPIO. For Broadcom
> >   * IP to function properly the bit 0 of CORESTAT register needs to be set/reset
> > - * to generate the CD IRQ handled in sdhci.c which schedules card_tasklet.
> > + * to generate the CD IRQ handled in sdhci.c which schedules card_bh_work.
>
> The comment was stale because sdhci.c has not had a card_tasklet for
> a long time.  Just drop the " which schedules card_tasklet"
>

 Will do. Thanks.

- Allen

> >   */
> >  static int sdhci_bcm_kona_sd_card_emulate(struct sdhci_host *host, int insert)
> >  {
>


-- 
       - Allen