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Message-ID: <20121206074551.GU10369@pengutronix.de> Date: Thu, 6 Dec 2012 08:45:51 +0100 From: Sascha Hauer <s.hauer@...gutronix.de> To: Lothar Waßmann <LW@...O-electronics.de> Cc: linux-mtd@...ts.infradead.org, Shawn Guo <shawn.guo@...aro.org>, linux-kernel@...r.kernel.org, David Woodhouse <dwmw2@...radead.org>, Artem Bityutskiy <artem.bityutskiy@...ux.intel.com> Subject: Re: [PATCH 1/2] mtd: mxc_nand: fix unbalanced clk_disable() in error path On Thu, Dec 06, 2012 at 08:42:27AM +0100, Lothar Waßmann wrote: > If nand_scan_ident() or nand_scan_tail() fails, the NAND chip may have > been deselected and the clock already disabled. Thus, check 'clk_act' > in the error path to decide whether the clock still needs to be > disabled. > > This fixes a: > |WARNING: at drivers/clk/clk.c:472 __clk_disable+0x3c/0x78() > > Signed-off-by: Lothar Waßmann <LW@...O-electronics.de> Both: Acked-by: Sascha Hauer <s.hauer@...gutronix.de> Sascha > --- > drivers/mtd/nand/mxc_nand.c | 3 ++- > 1 files changed, 2 insertions(+), 1 deletions(-) > > diff --git a/drivers/mtd/nand/mxc_nand.c b/drivers/mtd/nand/mxc_nand.c > index d316324..d965809 100644 > --- a/drivers/mtd/nand/mxc_nand.c > +++ b/drivers/mtd/nand/mxc_nand.c > @@ -1556,7 +1556,8 @@ static int mxcnd_probe(struct platform_device *pdev) > return 0; > > escan: > - clk_disable_unprepare(host->clk); > + if (host->clk_act) > + clk_disable_unprepare(host->clk); > > return err; > } > -- > 1.7.2.5 > > -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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