[U-Boot] [PATCH v6 04/26] pmic: Extend PMIC framework to support multiple instances of PMIC devices

[Lukasz Majewski]

Hi Anatolij,


Thank you for feedback.
> Hi Lukasz,
> 
> On Fri, 09 Nov 2012 08:42:09 +0100
> Lukasz Majewski <l.majewski at samsung.com> wrote:
> ...
> > diff --git a/board/davedenx/qong/qong.c b/board/davedenx/qong/qong.c
> > index c41f11d..e8c23f8 100644
> > --- a/board/davedenx/qong/qong.c
> > +++ b/board/davedenx/qong/qong.c
> > @@ -28,7 +28,7 @@
> >  #include <asm/arch/sys_proto.h>
> >  #include <asm/io.h>
> >  #include <nand.h>
> > -#include <pmic.h>
> > +#include <power/pmic.h>
> >  #include <fsl_pmic.h>
> >  #include <asm/gpio.h>
> >  #include "qong_fpga.h"
> > @@ -173,8 +173,8 @@ int board_late_init(void)
> >  	u32 val;
> >  	struct pmic *p;
> >  
> > -	pmic_init();
> > -	p = get_pmic();
> > +	pmic_init(I2C_PMIC);
> > +	p = pmic_get("FSL_PMIC");
> 
> Now the pmic struct is allocated dynamically, we should check if the
> allocation failed and bail out in this case to prevent dereferencing
> null pointer in pmic_get().
> 
> ...
> > diff --git a/drivers/misc/pmic_fsl.c b/drivers/misc/pmic_fsl.c
> > index 0ff75ed..868c3c4 100644
> > --- a/drivers/misc/pmic_fsl.c
> > +++ b/drivers/misc/pmic_fsl.c
> > @@ -23,7 +23,7 @@
> >  
> >  #include <common.h>
> >  #include <spi.h>
> > -#include <pmic.h>
> > +#include <power/pmic.h>
> >  #include <fsl_pmic.h>
> >  
> >  #if defined(CONFIG_PMIC_SPI)
> > @@ -33,9 +33,9 @@ static u32 pmic_spi_prepare_tx(u32 reg, u32 *val,
> > u32 write) }
> >  #endif
> >  
> > -int pmic_init(void)
> > +int pmic_init(unsigned char bus)
> >  {
> > -	struct pmic *p = get_pmic();
> > +	struct pmic *p = pmic_alloc();
> >  	static const char name[] = "FSL_PMIC";
> >  
> >  	p->name = name;
> > @@ -54,7 +54,7 @@ int pmic_init(void)
> >  	p->interface = PMIC_I2C;
> >  	p->hw.i2c.addr = CONFIG_SYS_FSL_PMIC_I2C_ADDR;
> >  	p->hw.i2c.tx_num = 3;
> > -	p->bus = I2C_PMIC;
> > +	p->bus = bus;
> 
> In the case the pmic_alloc() fails this code is now writing to pmic
> struct at NULL. Please check the return value of pmic_alloc() and
> bail out if needed. This applies to other drivers changed by this
> patch. Can you please fix it and resubmit a fixed patch 04/26.

One more time, thanks for spotting it. I will go through the patch
series and correct it.

BTW. I'm really stunned, how I managed to overlook this bug....

> 
> Thanks,
> Anatolij



-- 
Best regards,

Lukasz Majewski

Samsung Poland R&D Center | Linux Platform Group